| /* ==================================================================== |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ==================================================================== */ |
| |
| |
| package org.apache.poi.hssf.usermodel.examples; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| |
| import org.apache.poi.hssf.usermodel.HSSFWorkbook; |
| import org.apache.poi.ss.util.CellReference; |
| import org.apache.poi.hssf.usermodel.HSSFSheet; |
| import org.apache.poi.hssf.usermodel.HSSFRow; |
| import org.apache.poi.hssf.usermodel.HSSFClientAnchor; |
| import org.apache.poi.hssf.usermodel.HSSFPatriarch; |
| import org.apache.poi.ss.usermodel.ClientAnchor.AnchorType; |
| |
| |
| /** |
| * Demonstrates how to add an image to a worksheet and set that image's size |
| * to a specific number of milimetres irrespective of the width of the columns |
| * or height of the rows. Overridden methods are provided so that the location |
| * of the image - the cells row and column co-ordinates that define the top |
| * left hand corners of the image - can be identified either in the familiar |
| * Excel manner - A1 for instance - or using POI's methodolody of a column and |
| * row index where 0, 0 would indicate cell A1. |
| * |
| * The best way to make use of these techniques is to delay adding the image to |
| * the sheet until all other work has been completed. That way, the sizes of |
| * all rows and columns will have been adjusted - assuming that step was |
| * necessary. Even though the anchors type is set to prevent the image moving |
| * or re-sizing, this setting does not have any effect until the sheet is being |
| * viewed using the Excel application. |
| * |
| * The key to the process is the HSSFClientAnchor class. It accepts eight |
| * parameters that define, in order; |
| * |
| * * How far - in terms of co-ordinate position - the image should be inset |
| * from the left hand border of a cell. |
| * * How far - in terms of co-ordinate positions - the image should be inset |
| * from the from the top of the cell. |
| * * How far - in terms of co-ordinate positions - the right hand edge of |
| * the image should protrude into a cell (measured from the cell's left hand |
| * edge to the image's right hand edge). |
| * * How far - in terms of co-ordinate positions - the bottm edge of the |
| * image should protrude into a row (measured from the cell's top edge to |
| * the image's bottom edge). |
| * * The index of the column that contains the cell whose top left hand |
| * corner should be aligned with the top left hand corner of the image. |
| * * The index of the row that contains the cell whose top left hand corner |
| * should be aligned with the image's top left hand corner. |
| * * The index of the column that contains the cell whose top left hand |
| * corner should be aligned with the image's bottom right hand corner |
| * * The index number of the row that contains the cell whose top left |
| * hand corner should be aligned with the images bottom right hand corner. |
| * |
| * It can be used to add an image into cell A1, for example, in the following |
| * manner; |
| * |
| * HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0, |
| * (short)0, 0, (short)1, 1); |
| * |
| * The final four parameters determine that the top left hand corner should be |
| * aligned with the top left hand corner of cell A1 and it's bottom right |
| * hand corner with the top left hand corner of cell B2. Think of the image as |
| * being stretched so that it's top left hand corner is aligned with the top |
| * left hand corner of cell A1 and it's bottom right hand corner is aligned with |
| * the top left hand corner of cell B1. Interestingly, this would also produce |
| * the same results; |
| * |
| * anchor = new HSSFClientAnchor(0, 0, 1023, 255, |
| * (short)0, 0, (short)0, 0); |
| * |
| * Note that the final four parameters all contain the same value and seem to |
| * indicate that the images top left hand corner is aligned with the top left |
| * hand corner of cell A1 and that it's bottom right hand corner is also |
| * aligned with the top left hand corner of cell A1. Yet, running this code |
| * would see the image fully occupying cell A1. That is the result of the |
| * values passed to parameters three and four; these I have referred to as |
| * determing the images co-ordinates within the cell. They indicate that the |
| * image should occupy - in order - the full width of the column and the full |
| * height of the row. |
| * |
| * The co-ordinate values shown are the maxima; and they are independent of |
| * row height/column width and of the font used. Passing 255 will always result |
| * in the image occupying the full height of the row and passing 1023 will |
| * always result in the image occupying the full width of the column. They help |
| * in situations where an image is larger than a column/row and must overlap |
| * into the next column/row. Using them does mean, however, that it is often |
| * necessary to perform conversions between Excel's characters units, points, |
| * pixels and millimetres in order to establish how many rows/columns an image |
| * should occupy and just what the varous insets ought to be. |
| * |
| * Note that the first two parameters of the HSSFClientAchor classes constructor |
| * are not made use of in the code that follows. It would be fairly trivial |
| * however to extend these example further and provide methods that would centre |
| * an image within a cell or allow the user to specify that a plain border a |
| * fixed number of millimetres wide should wrap around the image. Those first |
| * two parameters would make this sort of functionality perfectly possible. |
| * |
| * Owing to the various conversions used, the actual size of the image may vary |
| * from that required; testing has so far found this to be in the region of |
| * plus or minus two millimetres. Most likely by modifying the way the |
| * calculations are performed - possibly using double(s) throughout and |
| * rounding the values at the correct point - it is likely that these errors |
| * could be reduced or removed. |
| * |
| * A note concerning Excels' image resizing behaviour. The HSSFClientAnchor |
| * class contains a method called setAnchorType(int) which can be used to |
| * determine how Excel will resize an image in reponse to the user increasing |
| * or decreasing the dimensions of the cell containing the image. There are |
| * three values that can be passed to this method; 0 = To move and size the |
| * image with the cell, 2 = To move but don't size the image with the cell, |
| * 3 = To prevent the image from moving or being resized along with the cell. If |
| * an image is inserted using this class and placed into a single cell then if |
| * the setAnchorType(int) method is called and a value of either 0 or 2 passed |
| * to it, the resultant resizing behaviour may be a surprise. The image will not |
| * grow in size of the column is made wider or the row higher but it will shrink |
| * if the columns width or rows height are reduced. |
| * |
| * @author Mark Beardsley [msb at apache.org] |
| * @version 1.00 5th August 2009. |
| */ |
| public class AddDimensionedImage { |
| |
| // Four constants that determine how - and indeed whether - the rows |
| // and columns an image may overlie should be expanded to accomodate that |
| // image. |
| // Passing EXPAND_ROW will result in the height of a row being increased |
| // to accomodate the image if it is not already larger. The image will |
| // be layed across one or more columns. |
| // Passing EXPAND_COLUMN will result in the width of the column being |
| // increased to accomodate the image if it is not already larger. The image |
| // will be layed across one or many rows. |
| // Passing EXPAND_ROW_AND_COLUMN will result in the height of the row |
| // bing increased along with the width of the column to accomdate the |
| // image if either is not already larger. |
| // Passing OVERLAY_ROW_AND_COLUMN will result in the image being layed |
| // over one or more rows and columns. No row or column will be resized, |
| // instead, code will determine how many rows and columns the image should |
| // overlie. |
| public static final int EXPAND_ROW = 1; |
| public static final int EXPAND_COLUMN = 2; |
| public static final int EXPAND_ROW_AND_COLUMN = 3; |
| public static final int OVERLAY_ROW_AND_COLUMN = 7; |
| |
| /** |
| * Add an image to a worksheet. |
| * |
| * @param cellNumber A String that contains the location of the cell whose |
| * top left hand corner should be aligned with the top |
| * left hand corner of the image; for example "A1", "A2" |
| * etc. This is to support the familiar Excel syntax. |
| * Whilst images are are not actually inserted into cells |
| * this provides a convenient method of indicating where |
| * the image should be positioned on the sheet. |
| * @param sheet A reference to the sheet that contains the cell referenced |
| * above. |
| * @param imageFile A String that encapsulates the name of and path to |
| * the image that is to be 'inserted into' the sheet. |
| * @param reqImageWidthMM A primitive double that contains the required |
| * width of the image in millimetres. |
| * @param reqImageHeightMM A primitive double that contains the required |
| * height of the image in millimetres. |
| * @param resizeBehaviour A primitive int whose value will determine how |
| * the code should react if the image is larger than |
| * the cell referenced by the cellNumber parameter. |
| * Four constants are provided to determine what |
| * should happen; |
| * AddDimensionedImage.EXPAND_ROW |
| * AddDimensionedImage.EXPAND_COLUMN |
| * AddDimensionedImage.EXPAND_ROW_AND_COLUMN |
| * AddDimensionedImage.OVERLAY_ROW_AND_COLUMN |
| * @throws java.io.FileNotFoundException If the file containing the image |
| * cannot be located. |
| * @throws java.io.IOException If a problem occurs whilst reading the file |
| * of image data. |
| * @throws java.lang.IllegalArgumentException If an invalid value is passed |
| * to the resizeBehaviour |
| * parameter. |
| */ |
| public void addImageToSheet(String cellNumber, HSSFSheet sheet, |
| String imageFile, double reqImageWidthMM, double reqImageHeightMM, |
| int resizeBehaviour) throws IOException, IllegalArgumentException { |
| // Convert the String into column and row indices then chain the |
| // call to the overridden addImageToSheet() method. |
| CellReference cellRef = new CellReference(cellNumber); |
| this.addImageToSheet(cellRef.getCol(), cellRef.getRow(), sheet, |
| imageFile, reqImageWidthMM, reqImageHeightMM,resizeBehaviour); |
| } |
| |
| /** |
| * Add an image to a worksheet. |
| * |
| * @param colNumber A primitive int that contains the index number of a |
| * column on the worksheet; POI column indices are zero |
| * based. Together with the rowNumber parameter's value, |
| * this parameter identifies a cell on the worksheet. The |
| * image's top left hand corner will be aligned with the |
| * top left hand corner of this cell. |
| * @param rowNumber A primtive int that contains the index number of a row |
| * on the worksheet; POI row indices are zero based. |
| * Together with the rowNumber parameter's value, this |
| * parameter identifies a cell on the worksheet. The |
| * image's top left hand corner will be aligned with the |
| * top left hand corner of this cell. |
| * @param sheet A reference to the sheet that contains the cell identified |
| * by the two parameters above. |
| * @param imageFile A String that encapsulates the name of and path to |
| * the image that is to be 'inserted into' the sheet. |
| * @param reqImageWidthMM A primitive double that contains the required |
| * width of the image in millimetres. |
| * @param reqImageHeightMM A primitive double that contains the required |
| * height of the image in millimetres. |
| * @param resizeBehaviour A primitive int whose value will determine how |
| * the code should react if the image is larger than |
| * the cell referenced by the colNumber and |
| * rowNumber parameters. Four constants are provided |
| * to determine what should happen; |
| * AddDimensionedImage.EXPAND_ROW |
| * AddDimensionedImage.EXPAND_COLUMN |
| * AddDimensionedImage.EXPAND_ROW_AND_COLUMN |
| * AddDimensionedImage.OVERLAY_ROW_AND_COLUMN |
| * @throws java.io.FileNotFoundException If the file containing the image |
| * cannot be located. |
| * @throws java.io.IOException If a problem occurs whilst reading the file |
| * of image data. |
| * @throws java.lang.IllegalArgumentException If an invalid value is passed |
| * to the resizeBehaviour |
| * parameter. |
| */ |
| private void addImageToSheet(int colNumber, int rowNumber, HSSFSheet sheet, |
| String imageFile, double reqImageWidthMM, double reqImageHeightMM, |
| int resizeBehaviour) throws FileNotFoundException, IOException, |
| IllegalArgumentException { |
| HSSFClientAnchor anchor = null; |
| HSSFPatriarch patriarch = null; |
| ClientAnchorDetail rowClientAnchorDetail = null; |
| ClientAnchorDetail colClientAnchorDetail = null; |
| |
| // Validate the resizeBehaviour parameter. |
| if((resizeBehaviour != AddDimensionedImage.EXPAND_COLUMN) && |
| (resizeBehaviour != AddDimensionedImage.EXPAND_ROW) && |
| (resizeBehaviour != AddDimensionedImage.EXPAND_ROW_AND_COLUMN) && |
| (resizeBehaviour != AddDimensionedImage.OVERLAY_ROW_AND_COLUMN)) { |
| throw new IllegalArgumentException("Invalid value passed to the " + |
| "resizeBehaviour parameter of AddDimensionedImage.addImageToSheet()"); |
| } |
| |
| // Call methods to calculate how the image and sheet should be |
| // manipulated to accomodate the image; columns and then rows. |
| colClientAnchorDetail = this.fitImageToColumns(sheet, colNumber, |
| reqImageWidthMM, resizeBehaviour); |
| rowClientAnchorDetail = this.fitImageToRows(sheet, rowNumber, |
| reqImageHeightMM, resizeBehaviour); |
| |
| // Having determined if and how to resize the rows, columns and/or the |
| // image, create the HSSFClientAnchor object to position the image on |
| // the worksheet. Note how the two ClientAnchorDetail records are |
| // interrogated to recover the row/column co-ordinates and any insets. |
| // The first two parameters are not used currently but could be if the |
| // need arose to extend the functionality of this code by adding the |
| // ability to specify that a clear 'border' be placed around the image. |
| anchor = new HSSFClientAnchor(0, |
| 0, |
| colClientAnchorDetail.getInset(), |
| rowClientAnchorDetail.getInset(), |
| (short)colClientAnchorDetail.getFromIndex(), |
| rowClientAnchorDetail.getFromIndex(), |
| (short)colClientAnchorDetail.getToIndex(), |
| rowClientAnchorDetail.getToIndex()); |
| |
| // For now, set the anchor type to do not move or resize the |
| // image as the size of the row/column is adjusted. This could easilly |
| // become another parameter passed to the method. |
| //anchor.setAnchorType(HSSFClientAnchor.DONT_MOVE_AND_RESIZE); |
| anchor.setAnchorType(AnchorType.MOVE_AND_RESIZE); |
| |
| // Now, add the picture to the workbook. Note that the type is assumed |
| // to be a JPEG/JPG, this could easily (and should) be parameterised |
| // however. |
| //int index = sheet.getWorkbook().addPicture(this.imageToBytes(imageFile), |
| // HSSFWorkbook.PICTURE_TYPE_JPEG); |
| int index = sheet.getWorkbook().addPicture(this.imageToBytes(imageFile), HSSFWorkbook.PICTURE_TYPE_PNG); |
| |
| // Get the drawing patriarch and create the picture. |
| patriarch = sheet.createDrawingPatriarch(); |
| patriarch.createPicture(anchor, index); |
| } |
| |
| /** |
| * Determines whether the sheets columns should be re-sized to accomodate |
| * the image, adjusts the columns width if necessary and creates then |
| * returns a ClientAnchorDetail object that facilitates construction of |
| * an HSSFClientAnchor that will fix the image on the sheet and establish |
| * it's size. |
| * |
| * @param sheet A reference to the sheet that will 'contain' the image. |
| * @param colNumber A primtive int that contains the index number of a |
| * column on the sheet. |
| * @param reqImageWidthMM A primtive double that contains the required |
| * width of the image in millimetres |
| * @param resizeBehaviour A primitve int whose value will indicate how the |
| * width of the column should be adjusted if the |
| * required width of the image is greater than the |
| * width of the column. |
| * @return An instance of the ClientAnchorDetail class that will contain |
| * the index number of the column containing the cell whose top |
| * left hand corner also defines the top left hand corner of the |
| * image, the index number column containing the cell whose top |
| * left hand corner also defines the bottom right hand corner of |
| * the image and an inset that determines how far the right hand |
| * edge of the image can protrude into the next column - expressed |
| * as a specific number of co-ordinate positions. |
| */ |
| private ClientAnchorDetail fitImageToColumns(HSSFSheet sheet, int colNumber, |
| double reqImageWidthMM, int resizeBehaviour) { |
| |
| double colWidthMM = 0.0D; |
| double colCoordinatesPerMM = 0.0D; |
| int pictureWidthCoordinates = 0; |
| ClientAnchorDetail colClientAnchorDetail = null; |
| |
| // Get the colum's width in millimetres |
| colWidthMM = ConvertImageUnits.widthUnits2Millimetres( |
| (short)sheet.getColumnWidth(colNumber)); |
| |
| // Check that the column's width will accomodate the image at the |
| // required dimension. If the width of the column is LESS than the |
| // required width of the image, decide how the application should |
| // respond - resize the column or overlay the image across one or more |
| // columns. |
| if(colWidthMM < reqImageWidthMM) { |
| |
| // Should the column's width simply be expanded? |
| if((resizeBehaviour == AddDimensionedImage.EXPAND_COLUMN) || |
| (resizeBehaviour == AddDimensionedImage.EXPAND_ROW_AND_COLUMN)) { |
| // Set the width of the column by converting the required image |
| // width from millimetres into Excel's column width units. |
| sheet.setColumnWidth(colNumber, |
| ConvertImageUnits.millimetres2WidthUnits(reqImageWidthMM)); |
| // To make the image occupy the full width of the column, convert |
| // the required width of the image into co-ordinates. This value |
| // will become the inset for the ClientAnchorDetail class that |
| // is then instantiated. |
| colWidthMM = reqImageWidthMM; |
| colCoordinatesPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS / |
| colWidthMM; |
| pictureWidthCoordinates = (int)(reqImageWidthMM * colCoordinatesPerMM); |
| colClientAnchorDetail = new ClientAnchorDetail(colNumber, |
| colNumber, pictureWidthCoordinates); |
| } |
| // If the user has chosen to overlay both rows and columns or just |
| // to expand ONLY the size of the rows, then calculate how to lay |
| // the image out across one or more columns. |
| else if ((resizeBehaviour == AddDimensionedImage.OVERLAY_ROW_AND_COLUMN) || |
| (resizeBehaviour == AddDimensionedImage.EXPAND_ROW)) { |
| colClientAnchorDetail = this.calculateColumnLocation(sheet, |
| colNumber, reqImageWidthMM); |
| } |
| } |
| // If the column is wider than the image. |
| else { |
| // Mow many co-ordinate positions are there per millimetre? |
| colCoordinatesPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS / |
| colWidthMM; |
| // Given the width of the image, what should be it's co-ordinate? |
| pictureWidthCoordinates = (int)(reqImageWidthMM * colCoordinatesPerMM); |
| colClientAnchorDetail = new ClientAnchorDetail(colNumber, |
| colNumber, pictureWidthCoordinates); |
| } |
| return(colClientAnchorDetail); |
| } |
| |
| /** |
| * Determines whether the sheet's row should be re-sized to accomodate |
| * the image, adjusts the rows height if necessary and creates then |
| * returns a ClientAnchorDetail object that facilitates construction of |
| * an HSSFClientAnchor that will fix the image on the sheet and establish |
| * it's size. |
| * |
| * @param sheet A reference to the sheet that will 'contain' the image. |
| * @param rowNumber A primtive int that contains the index number of a |
| * row on the sheet. |
| * @param reqImageHeightMM A primtive double that contains the required |
| * height of the image in millimetres |
| * @param resizeBehaviour A primitve int whose value will indicate how the |
| * height of the row should be adjusted if the |
| * required height of the image is greater than the |
| * height of the row. |
| * @return An instance of the ClientAnchorDetail class that will contain |
| * the index number of the row containing the cell whose top |
| * left hand corner also defines the top left hand corner of the |
| * image, the index number of the row containing the cell whose |
| * top left hand corner also defines the bottom right hand |
| * corner of the image and an inset that determines how far the |
| * bottom edge of the image can protrude into the next (lower) |
| * row - expressed as a specific number of co-ordinate positions. |
| */ |
| private ClientAnchorDetail fitImageToRows(HSSFSheet sheet, int rowNumber, |
| double reqImageHeightMM, int resizeBehaviour) { |
| HSSFRow row = null; |
| double rowHeightMM = 0.0D; |
| double rowCoordinatesPerMM = 0.0D; |
| int pictureHeightCoordinates = 0; |
| ClientAnchorDetail rowClientAnchorDetail = null; |
| |
| // Get the row and it's height |
| row = sheet.getRow(rowNumber); |
| if(row == null) { |
| // Create row if it does not exist. |
| row = sheet.createRow(rowNumber); |
| } |
| |
| // Get the row's height in millimetres |
| rowHeightMM = row.getHeightInPoints() / ConvertImageUnits.POINTS_PER_MILLIMETRE; |
| |
| // Check that the row's height will accomodate the image at the required |
| // dimensions. If the height of the row is LESS than the required height |
| // of the image, decide how the application should respond - resize the |
| // row or overlay the image across a series of rows. |
| if(rowHeightMM < reqImageHeightMM) { |
| if((resizeBehaviour == AddDimensionedImage.EXPAND_ROW) || |
| (resizeBehaviour == AddDimensionedImage.EXPAND_ROW_AND_COLUMN)) { |
| row.setHeightInPoints((float)(reqImageHeightMM * |
| ConvertImageUnits.POINTS_PER_MILLIMETRE)); |
| rowHeightMM = reqImageHeightMM; |
| rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS / |
| rowHeightMM; |
| pictureHeightCoordinates = (int)(reqImageHeightMM * rowCoordinatesPerMM); |
| rowClientAnchorDetail = new ClientAnchorDetail(rowNumber, |
| rowNumber, pictureHeightCoordinates); |
| } |
| // If the user has chosen to overlay both rows and columns or just |
| // to expand ONLY the size of the columns, then calculate how to lay |
| // the image out ver one or more rows. |
| else if((resizeBehaviour == AddDimensionedImage.OVERLAY_ROW_AND_COLUMN) || |
| (resizeBehaviour == AddDimensionedImage.EXPAND_COLUMN)) { |
| rowClientAnchorDetail = this.calculateRowLocation(sheet, |
| rowNumber, reqImageHeightMM); |
| } |
| } |
| // Else, if the image is smaller than the space available |
| else { |
| rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS / |
| rowHeightMM; |
| pictureHeightCoordinates = (int)(reqImageHeightMM * rowCoordinatesPerMM); |
| rowClientAnchorDetail = new ClientAnchorDetail(rowNumber, |
| rowNumber, pictureHeightCoordinates); |
| } |
| return(rowClientAnchorDetail); |
| } |
| |
| /** |
| * If the image is to overlie more than one column, calculations need to be |
| * performed to determine how many columns and whether the image will |
| * overlie just a part of one column in order to be presented at the |
| * required size. |
| * |
| * @param sheet The sheet that will 'contain' the image. |
| * @param startingColumn A primitive int whose value is the index of the |
| * column that contains the cell whose top left hand |
| * corner should be aligned with the top left hand |
| * corner of the image. |
| * @param reqImageWidthMM A primitive double whose value will indicate the |
| * required width of the image in millimetres. |
| * @return An instance of the ClientAnchorDetail class that will contain |
| * the index number of the column containing the cell whose top |
| * left hand corner also defines the top left hand corner of the |
| * image, the index number column containing the cell whose top |
| * left hand corner also defines the bottom right hand corner of |
| * the image and an inset that determines how far the right hand |
| * edge of the image can protrude into the next column - expressed |
| * as a specific number of co-ordinate positions. |
| */ |
| private ClientAnchorDetail calculateColumnLocation(HSSFSheet sheet, |
| int startingColumn, |
| double reqImageWidthMM) { |
| ClientAnchorDetail anchorDetail = null; |
| double totalWidthMM = 0.0D; |
| double colWidthMM = 0.0D; |
| double overlapMM = 0.0D; |
| double coordinatePositionsPerMM = 0.0D; |
| int toColumn = startingColumn; |
| int inset = 0; |
| |
| // Calculate how many columns the image will have to |
| // span in order to be presented at the required size. |
| while(totalWidthMM < reqImageWidthMM) { |
| colWidthMM = ConvertImageUnits.widthUnits2Millimetres( |
| (short)(sheet.getColumnWidth(toColumn))); |
| // Note use of the cell border width constant. Testing with an image |
| // declared to fit exactly into one column demonstrated that it's |
| // width was greater than the width of the column the POI returned. |
| // Further, this difference was a constant value that I am assuming |
| // related to the cell's borders. Either way, that difference needs |
| // to be allowed for in this calculation. |
| totalWidthMM += (colWidthMM + ConvertImageUnits.CELL_BORDER_WIDTH_MILLIMETRES); |
| toColumn++; |
| } |
| // De-crement by one the last column value. |
| toColumn--; |
| // Highly unlikely that this will be true but, if the width of a series |
| // of columns is exactly equal to the required width of the image, then |
| // simply build a ClientAnchorDetail object with an inset equal to the |
| // total number of co-ordinate positions available in a column, a |
| // from column co-ordinate (top left hand corner) equal to the value |
| // of the startingColumn parameter and a to column co-ordinate equal |
| // to the toColumn variable. |
| // |
| // Convert both values to ints to perform the test. |
| if((int)totalWidthMM == (int)reqImageWidthMM) { |
| // A problem could occur if the image is sized to fit into one or |
| // more columns. If that occurs, the value in the toColumn variable |
| // will be in error. To overcome this, there are two options, to |
| // ibcrement the toColumn variable's value by one or to pass the |
| // total number of co-ordinate positions to the third paramater |
| // of the ClientAnchorDetail constructor. For no sepcific reason, |
| // the latter option is used below. |
| anchorDetail = new ClientAnchorDetail(startingColumn, |
| toColumn, ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS); |
| } |
| // In this case, the image will overlap part of another column and it is |
| // necessary to calculate just how much - this will become the inset |
| // for the ClientAnchorDetail object. |
| else { |
| // Firstly, claculate how much of the image should overlap into |
| // the next column. |
| overlapMM = reqImageWidthMM - (totalWidthMM - colWidthMM); |
| |
| // When the required size is very close indded to the column size, |
| // the calcaulation above can produce a negative value. To prevent |
| // problems occuring in later caculations, this is simply removed |
| // be setting the overlapMM value to zero. |
| if(overlapMM < 0) { |
| overlapMM = 0.0D; |
| } |
| |
| // Next, from the columns width, calculate how many co-ordinate |
| // positons there are per millimetre |
| coordinatePositionsPerMM = ConvertImageUnits.TOTAL_COLUMN_COORDINATE_POSITIONS / |
| colWidthMM; |
| // From this figure, determine how many co-ordinat positions to |
| // inset the left hand or bottom edge of the image. |
| inset = (int)(coordinatePositionsPerMM * overlapMM); |
| |
| // Now create the ClientAnchorDetail object, setting the from and to |
| // columns and the inset. |
| anchorDetail = new ClientAnchorDetail(startingColumn, toColumn, inset); |
| } |
| return(anchorDetail); |
| } |
| |
| /** |
| * If the image is to overlie more than one rows, calculations need to be |
| * performed to determine how many rows and whether the image will |
| * overlie just a part of one row in order to be presented at the |
| * required size. |
| * |
| * @param sheet The sheet that will 'contain' the image. |
| * @param startingRow A primitive int whose value is the index of the row |
| * that contains the cell whose top left hand corner |
| * should be aligned with the top left hand corner of |
| * the image. |
| * @param reqImageHeightMM A primitive double whose value will indicate the |
| * required height of the image in millimetres. |
| * @return An instance of the ClientAnchorDetail class that will contain |
| * the index number of the row containing the cell whose top |
| * left hand corner also defines the top left hand corner of the |
| * image, the index number of the row containing the cell whose top |
| * left hand corner also defines the bottom right hand corner of |
| * the image and an inset that determines how far the bottom edge |
| * can protrude into the next (lower) row - expressed as a specific |
| * number of co-ordinate positions. |
| */ |
| private ClientAnchorDetail calculateRowLocation(HSSFSheet sheet, |
| int startingRow, double reqImageHeightMM) { |
| ClientAnchorDetail clientAnchorDetail = null; |
| HSSFRow row = null; |
| double rowHeightMM = 0.0D; |
| double totalRowHeightMM = 0.0D; |
| double overlapMM = 0.0D; |
| double rowCoordinatesPerMM = 0.0D; |
| int toRow = startingRow; |
| int inset = 0; |
| |
| // Step through the rows in the sheet and accumulate a total of their |
| // heights. |
| while(totalRowHeightMM < reqImageHeightMM) { |
| row = sheet.getRow(toRow); |
| // Note, if the row does not already exist on the sheet then create |
| // it here. |
| if(row == null) { |
| row = sheet.createRow(toRow); |
| } |
| // Get the row's height in millimetres and add to the running total. |
| rowHeightMM = row.getHeightInPoints() / |
| ConvertImageUnits.POINTS_PER_MILLIMETRE; |
| totalRowHeightMM += rowHeightMM; |
| toRow++; |
| } |
| // Owing to the way the loop above works, the rowNumber will have been |
| // incremented one row too far. Undo that here. |
| toRow--; |
| // Check to see whether the image should occupy an exact number of |
| // rows. If so, build the ClientAnchorDetail record to point |
| // to those rows and with an inset of the total number of co-ordinate |
| // position in the row. |
| // |
| // To overcome problems that can occur with comparing double values for |
| // equality, cast both to int(s) to truncate the value; VERY crude and |
| // I do not really like it!! |
| if((int)totalRowHeightMM == (int)reqImageHeightMM) { |
| clientAnchorDetail = new ClientAnchorDetail(startingRow, toRow, |
| ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS); |
| } |
| else { |
| // Calculate how far the image will project into the next row. Note |
| // that the height of the last row assessed is subtracted from the |
| // total height of all rows assessed so far. |
| overlapMM = reqImageHeightMM - (totalRowHeightMM - rowHeightMM); |
| |
| // To prevent an exception being thrown when the required width of |
| // the image is very close indeed to the column size. |
| if(overlapMM < 0) { |
| overlapMM = 0.0D; |
| } |
| |
| rowCoordinatesPerMM = ConvertImageUnits.TOTAL_ROW_COORDINATE_POSITIONS / |
| rowHeightMM; |
| inset = (int)(overlapMM * rowCoordinatesPerMM); |
| clientAnchorDetail = new ClientAnchorDetail(startingRow, |
| toRow, inset); |
| } |
| return(clientAnchorDetail); |
| } |
| |
| /** |
| * Loads - reads in and converts into an array of byte(s) - an image from |
| * a named file. |
| * |
| * Note: this method should be modified so that the type of the image may |
| * also be passed to it. Currently, it assumes that all images are |
| * JPG/JPEG(s). |
| * |
| * @param imageFilename A String that encapsulates the path to and name |
| * of the file that contains the image which is to be |
| * 'loaded'. |
| * @return An array of type byte that contains the raw data of the named |
| * image. |
| * @throws java.io.FileNotFoundException Thrown if it was not possible to |
| * open the specified file. |
| * @throws java.io.IOException Thrown if reading the file failed or was |
| * interrupted. |
| */ |
| private byte[] imageToBytes(String imageFilename) throws IOException { |
| File imageFile = null; |
| FileInputStream fis = null; |
| ByteArrayOutputStream bos = null; |
| int read = 0; |
| try { |
| imageFile = new File(imageFilename); |
| fis = new FileInputStream(imageFile); |
| bos = new ByteArrayOutputStream(); |
| while((read = fis.read()) != -1) { |
| bos.write(read); |
| } |
| return(bos.toByteArray()); |
| } |
| finally { |
| if(fis != null) { |
| try { |
| fis.close(); |
| fis = null; |
| } |
| catch(IOException ioEx) { |
| // Nothing to do here |
| } |
| } |
| } |
| } |
| |
| /** |
| * The main entry point to the program. It contains code that demonstrates |
| * one way to use the program. |
| * |
| * Note, the code is not restricted to use on new workbooks only. If an |
| * image is to be inserted into an existing workbook. just open that |
| * workbook, gat a reference to a sheet and pass that; |
| * |
| * AddDimensionedImage addImage = new AddDimensionedImage(); |
| * |
| * File file = new File("....... Existing Workbook ......."); |
| * FileInputStream fis = new FileInputStream(file); |
| * HSSFWorkbook workbook = new HSSFWorkbook(fis); |
| * HSSFSheet sheet = workbook.getSheetAt(0); |
| * addImage.addImageToSheet("C3", sheet, "image.jpg", 30, 20, |
| * AddDimensionedImage.EXPAND.ROW); |
| * |
| * @param args the command line arguments |
| */ |
| public static void main(String[] args) { |
| String imageFile = null; |
| String outputFile = null; |
| FileOutputStream fos = null; |
| HSSFSheet sheet = null; |
| try { |
| if(args.length < 2){ |
| System.err.println("Usage: AddDimensionedImage imageFile outputFile"); |
| return; |
| } |
| imageFile = args[0]; |
| outputFile = args[1]; |
| |
| HSSFWorkbook workbook = new HSSFWorkbook(); |
| sheet = workbook.createSheet("Picture Test"); |
| new AddDimensionedImage().addImageToSheet("A1", sheet, |
| imageFile, 125, 125, |
| AddDimensionedImage.EXPAND_ROW_AND_COLUMN); |
| fos = new FileOutputStream(outputFile); |
| workbook.write(fos); |
| workbook.close(); |
| } |
| catch(FileNotFoundException fnfEx) { |
| System.out.println("Caught an: " + fnfEx.getClass().getName()); |
| System.out.println("Message: " + fnfEx.getMessage()); |
| System.out.println("Stacktrace follows..........."); |
| fnfEx.printStackTrace(System.out); |
| } |
| catch(IOException ioEx) { |
| System.out.println("Caught an: " + ioEx.getClass().getName()); |
| System.out.println("Message: " + ioEx.getMessage()); |
| System.out.println("Stacktrace follows..........."); |
| ioEx.printStackTrace(System.out); |
| } |
| finally { |
| try { |
| if(fos != null) { |
| fos.close(); |
| fos = null; |
| } |
| } catch(IOException ioEx) { |
| // I G N O R E |
| } |
| } |
| } |
| |
| /** |
| * The HSSFClientAnchor class accepts eight parameters. In order, these are; |
| * |
| * * How far the left hand edge of the image is inset from the left hand |
| * edge of the cell |
| * * How far the top edge of the image is inset from the top of the cell |
| * * How far the right hand edge of the image is inset from the left |
| * hand edge of the cell |
| * * How far the bottom edge of the image is inset from the top of the |
| * cell. |
| * * Together, parameters five and six determine the column and row |
| * co-ordinates of the cell whose top left hand corner will be aligned |
| * with the image's top left hand corner. |
| * * Together, parameter seven and eight determine the column and row |
| * co-ordinates of the cell whose top left hand corner will be aligned |
| * with the images bottom right hand corner. |
| * |
| * An instance of the ClientAnchorDetail class provides three of the eight |
| * parameters, one of the co-ordinates for the images top left hand corner, |
| * one of the co-ordinates for the images bottom right hand corner and |
| * either how far the image should be inset from the top or the left hand |
| * edge of the cell. |
| * |
| * @author Mark Beardsley [mas at apache.org] |
| * @version 1.00 5th August 2009. |
| */ |
| public class ClientAnchorDetail { |
| |
| public int fromIndex = 0; |
| public int toIndex = 0; |
| public int inset = 0; |
| |
| /** |
| * Create a new instance of the ClientAnchorDetail class using the |
| * following parameters. |
| * |
| * @param fromIndex A primitive int that contains one of the |
| * co-ordinates (row or column index) for the top left |
| * hand corner of the image. |
| * @param toIndex A primitive int that contains one of the |
| * co-ordinates (row or column index) for the bottom |
| * right hand corner of the image. |
| * @param inset A primitive int that contains a value which indicates |
| * how far the image should be inset from the top or the |
| * left hand edge of a cell. |
| */ |
| public ClientAnchorDetail(int fromIndex, int toIndex, int inset) { |
| this.fromIndex = fromIndex; |
| this.toIndex = toIndex; |
| this.inset = inset; |
| } |
| |
| /** |
| * Get one of the number of the column or row that contains the cell |
| * whose top left hand corner will be aligned with the top left hand |
| * corner of the image. |
| * |
| * @return The value - row or column index - for one of the co-ordinates |
| * of the top left hand corner of the image. |
| */ |
| public int getFromIndex() { |
| return(this.fromIndex); |
| } |
| |
| /** |
| * Get one of the number of the column or row that contains the cell |
| * whose top left hand corner will be aligned with the bottom righ hand |
| * corner of the image. |
| * |
| * @return The value - row or column index - for one of the co-ordinates |
| * of the bottom right hand corner of the image. |
| */ |
| public int getToIndex() { |
| return(this.toIndex); |
| } |
| |
| /** |
| * Get the image's offset from the edge of a cell. |
| * |
| * @return How far either the right hand or bottom edge of the image is |
| * inset from the left hand or top edge of a cell. |
| */ |
| public int getInset() { |
| return(this.inset); |
| } |
| } |
| |
| /** |
| * Utility methods used to convert Excel's character based column and row |
| * size measurements into pixels and/or millimetres. The class also contains |
| * various constants that are required in other calculations. |
| * |
| * @author xio[darjino@hotmail.com] |
| * @version 1.01 30th July 2009. |
| * Added by Mark Beardsley [msb at apache.org]. |
| * Additional constants. |
| * widthUnits2Millimetres() and millimetres2Units() methods. |
| */ |
| public static class ConvertImageUnits { |
| |
| // Each cell conatins a fixed number of co-ordinate points; this number |
| // does not vary with row height or column width or with font. These two |
| // constants are defined below. |
| public static final int TOTAL_COLUMN_COORDINATE_POSITIONS = 1023; // MB |
| public static final int TOTAL_ROW_COORDINATE_POSITIONS = 255; // MB |
| // The resoultion of an image can be expressed as a specific number |
| // of pixels per inch. Displays and printers differ but 96 pixels per |
| // inch is an acceptable standard to beging with. |
| public static final int PIXELS_PER_INCH = 96; // MB |
| // Cnstants that defines how many pixels and points there are in a |
| // millimetre. These values are required for the conversion algorithm. |
| public static final double PIXELS_PER_MILLIMETRES = 3.78; // MB |
| public static final double POINTS_PER_MILLIMETRE = 2.83; // MB |
| // The column width returned by HSSF and the width of a picture when |
| // positioned to exactly cover one cell are different by almost exactly |
| // 2mm - give or take rounding errors. This constant allows that |
| // additional amount to be accounted for when calculating how many |
| // celles the image ought to overlie. |
| public static final double CELL_BORDER_WIDTH_MILLIMETRES = 2.0D; // MB |
| public static final short EXCEL_COLUMN_WIDTH_FACTOR = 256; |
| public static final int UNIT_OFFSET_LENGTH = 7; |
| public static final int[] UNIT_OFFSET_MAP = new int[] |
| { 0, 36, 73, 109, 146, 182, 219 }; |
| |
| /** |
| * pixel units to excel width units(units of 1/256th of a character width) |
| * @param pxs |
| * @return |
| */ |
| public static short pixel2WidthUnits(int pxs) { |
| short widthUnits = (short) (EXCEL_COLUMN_WIDTH_FACTOR * |
| (pxs / UNIT_OFFSET_LENGTH)); |
| widthUnits += UNIT_OFFSET_MAP[(pxs % UNIT_OFFSET_LENGTH)]; |
| return widthUnits; |
| } |
| |
| /** |
| * excel width units(units of 1/256th of a character width) to pixel |
| * units. |
| * |
| * @param widthUnits |
| * @return |
| */ |
| public static int widthUnits2Pixel(short widthUnits) { |
| int pixels = (widthUnits / EXCEL_COLUMN_WIDTH_FACTOR) |
| * UNIT_OFFSET_LENGTH; |
| int offsetWidthUnits = widthUnits % EXCEL_COLUMN_WIDTH_FACTOR; |
| pixels += Math.round(offsetWidthUnits / |
| ((float) EXCEL_COLUMN_WIDTH_FACTOR / UNIT_OFFSET_LENGTH)); |
| return pixels; |
| } |
| |
| /** |
| * Convert Excel's width units into millimetres. |
| * |
| * @param widthUnits The width of the column or the height of the |
| * row in Excel's units. |
| * @return A primitive double that contains the columns width or rows |
| * height in millimetres. |
| */ |
| public static double widthUnits2Millimetres(short widthUnits) { |
| return(ConvertImageUnits.widthUnits2Pixel(widthUnits) / |
| ConvertImageUnits.PIXELS_PER_MILLIMETRES); |
| } |
| |
| /** |
| * Convert into millimetres Excel's width units.. |
| * |
| * @param millimetres A primitive double that contains the columns |
| * width or rows height in millimetres. |
| * @return A primitive int that contains the columns width or rows |
| * height in Excel's units. |
| */ |
| public static int millimetres2WidthUnits(double millimetres) { |
| return(ConvertImageUnits.pixel2WidthUnits((int)(millimetres * |
| ConvertImageUnits.PIXELS_PER_MILLIMETRES))); |
| } |
| } |
| } |