| /* ==================================================================== |
| 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.xdgf.usermodel.section.geometry; |
| |
| import java.awt.geom.AffineTransform; |
| import java.awt.geom.Arc2D; |
| import java.awt.geom.Path2D; |
| import java.awt.geom.Point2D; |
| |
| import org.apache.poi.POIXMLException; |
| import org.apache.poi.xdgf.usermodel.XDGFCell; |
| import org.apache.poi.xdgf.usermodel.XDGFShape; |
| |
| import com.microsoft.schemas.office.visio.x2012.main.CellType; |
| import com.microsoft.schemas.office.visio.x2012.main.RowType; |
| |
| public class ArcTo implements GeometryRow { |
| |
| ArcTo _master = null; |
| |
| // The x-coordinate of the ending vertex of an arc. |
| Double x = null; |
| |
| // The y-coordinate of the ending vertex of an arc. |
| Double y = null; |
| |
| // The distance from the arc's midpoint to the midpoint of its chord. |
| Double a = null; |
| |
| Boolean deleted = null; |
| |
| // TODO: support formulas |
| |
| public ArcTo(RowType row) { |
| |
| if (row.isSetDel()) |
| deleted = row.getDel(); |
| |
| for (CellType cell : row.getCellArray()) { |
| String cellName = cell.getN(); |
| |
| if (cellName.equals("X")) { |
| x = XDGFCell.parseDoubleValue(cell); |
| } else if (cellName.equals("Y")) { |
| y = XDGFCell.parseDoubleValue(cell); |
| } else if (cellName.equals("A")) { |
| a = XDGFCell.parseDoubleValue(cell); |
| } else { |
| throw new POIXMLException("Invalid cell '" + cellName |
| + "' in ArcTo row"); |
| } |
| } |
| } |
| |
| public boolean getDel() { |
| if (deleted != null) |
| return deleted; |
| |
| if (_master != null) |
| return _master.getDel(); |
| |
| return false; |
| } |
| |
| public Double getX() { |
| return x == null ? _master.x : x; |
| } |
| |
| public Double getY() { |
| return y == null ? _master.y : y; |
| } |
| |
| public Double getA() { |
| return a == null ? _master.a : a; |
| } |
| |
| @Override |
| public void setupMaster(GeometryRow row) { |
| _master = (ArcTo) row; |
| } |
| |
| @Override |
| public void addToPath(Path2D.Double path, XDGFShape parent) { |
| |
| if (getDel()) |
| return; |
| |
| Point2D last = path.getCurrentPoint(); |
| |
| // intentionally shadowing variables here |
| double x = getX(); |
| double y = getY(); |
| double a = getA(); |
| |
| if (a == 0) { |
| path.lineTo(x, y); |
| return; |
| } |
| |
| double x0 = last.getX(); |
| double y0 = last.getY(); |
| |
| double chordLength = Math.hypot(y - y0, x - x0); |
| double radius = (4 * a * a + chordLength * chordLength) |
| / (8 * Math.abs(a)); |
| |
| // center point |
| double cx = x0 + (x - x0) / 2.0; |
| double cy = y0 + (y - y0) / 2.0; |
| |
| double rotate = Math.atan2(y - cy, x - cx); |
| |
| Arc2D arc = new Arc2D.Double(x0, y0 - radius, chordLength, 2 * radius, |
| 180, x0 < x ? 180 : -180, Arc2D.OPEN); |
| |
| path.append(AffineTransform.getRotateInstance(rotate, x0, y0) |
| .createTransformedShape(arc), true); |
| } |
| } |