| /***************************************************************************** |
| * Copyright (C) The Apache Software Foundation. All rights reserved. * |
| * ------------------------------------------------------------------------- * |
| * This software is published under the terms of the Apache Software License * |
| * version 1.1, a copy of which has been included with this distribution in * |
| * the LICENSE file. * |
| *****************************************************************************/ |
| |
| package org.apache.batik.extension.svg; |
| |
| import java.awt.geom.GeneralPath; |
| |
| import org.apache.batik.bridge.Bridge; |
| import org.apache.batik.bridge.BridgeContext; |
| import org.apache.batik.bridge.BridgeException; |
| import org.apache.batik.bridge.SVGDecoratedShapeElementBridge; |
| import org.apache.batik.bridge.SVGUtilities; |
| import org.apache.batik.bridge.UnitProcessor; |
| import org.apache.batik.gvt.ShapeNode; |
| import org.w3c.dom.Element; |
| |
| /** |
| * Bridge class for a regular polygon element. |
| * |
| * @author <a href="mailto:thomas.deweese@kodak.com">Thomas Deweese</a> |
| */ |
| public class BatikRegularPolygonElementBridge |
| extends SVGDecoratedShapeElementBridge |
| implements BatikExtConstants { |
| |
| /** |
| * Constructs a new bridge for the <rect> element. |
| */ |
| public BatikRegularPolygonElementBridge() { /* nothing */ } |
| |
| /** |
| * Returns the SVG namespace URI. |
| */ |
| public String getNamespaceURI() { |
| return BATIK_EXT_NAMESPACE_URI; |
| } |
| |
| /** |
| * Returns 'rect'. |
| */ |
| public String getLocalName() { |
| return BATIK_EXT_REGULAR_POLYGON_TAG; |
| } |
| |
| /** |
| * Returns a new instance of this bridge. |
| */ |
| public Bridge getInstance() { |
| return new BatikRegularPolygonElementBridge(); |
| } |
| |
| /** |
| * Constructs a regular polygone according to the specified parameters. |
| * |
| * @param ctx the bridge context to use |
| * @param e the element that describes a rect element |
| * @param shapeNode the shape node to initialize |
| */ |
| protected void buildShape(BridgeContext ctx, |
| Element e, |
| ShapeNode shapeNode) { |
| |
| UnitProcessor.Context uctx = UnitProcessor.createContext(ctx, e); |
| String s; |
| |
| // 'cx' attribute - default is 0 |
| s = e.getAttributeNS(null, SVG_CX_ATTRIBUTE); |
| float cx = 0; |
| if (s.length() != 0) { |
| cx = UnitProcessor.svgHorizontalCoordinateToUserSpace |
| (s, SVG_CX_ATTRIBUTE, uctx); |
| } |
| |
| // 'cy' attribute - default is 0 |
| s = e.getAttributeNS(null, SVG_CY_ATTRIBUTE); |
| float cy = 0; |
| if (s.length() != 0) { |
| cy = UnitProcessor.svgVerticalCoordinateToUserSpace |
| (s, SVG_CY_ATTRIBUTE, uctx); |
| } |
| |
| // 'r' attribute - required |
| s = e.getAttributeNS(null, SVG_R_ATTRIBUTE); |
| float r; |
| if (s.length() != 0) { |
| r = UnitProcessor.svgOtherLengthToUserSpace |
| (s, SVG_R_ATTRIBUTE, uctx); |
| } else { |
| throw new BridgeException(e, ERR_ATTRIBUTE_MISSING, |
| new Object[] {SVG_R_ATTRIBUTE, s}); |
| } |
| |
| // 'sides' attribute - default is 3 |
| int sides = convertSides(e, BATIK_EXT_SIDES_ATTRIBUTE, 3); |
| |
| GeneralPath gp = new GeneralPath(); |
| for (int i=0; i<sides; i++) { |
| double angle = (i+0.5)*(2*Math.PI/sides) - (Math.PI/2); |
| double x = cx + r*Math.cos(angle); |
| double y = cy - r*Math.sin(angle); |
| if (i==0) |
| gp.moveTo((float)x, (float)y); |
| else |
| gp.lineTo((float)x, (float)y); |
| } |
| gp.closePath(); |
| |
| shapeNode.setShape(gp); |
| } |
| |
| /** |
| * Stolen from AbstractSVGFilterPrimitiveElementBridge. |
| * Converts on the specified filter primitive element, the specified |
| * attribute that represents an integer and with the specified |
| * default value. |
| * |
| * @param filterElement the filter primitive element |
| * @param attrName the name of the attribute |
| * @param defaultValue the default value of the attribute |
| */ |
| protected static int convertSides(Element filterElement, |
| String attrName, |
| int defaultValue) { |
| String s = filterElement.getAttributeNS(null, attrName); |
| if (s.length() == 0) { |
| return defaultValue; |
| } else { |
| int ret = 0; |
| try { |
| ret = SVGUtilities.convertSVGInteger(s); |
| } catch (NumberFormatException ex) { |
| throw new BridgeException |
| (filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED, |
| new Object[] {attrName, s}); |
| } |
| |
| if (ret <3) |
| throw new BridgeException |
| (filterElement, ERR_ATTRIBUTE_VALUE_MALFORMED, |
| new Object[] {attrName, s}); |
| return ret; |
| } |
| } |
| } |