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18 package org.apache.batik.dom.svg;
19
20 import java.awt.geom.AffineTransform  ;
21 import java.awt.geom.NoninvertibleTransformException ;
22
23 import org.apache.batik.css.engine.SVGCSSEngine;
24 import org.w3c.dom.DOMException ;
25 import org.w3c.dom.Element ;
26 import org.w3c.dom.svg.SVGElement;
27 import org.w3c.dom.svg.SVGException;
28 import org.w3c.dom.svg.SVGFitToViewBox;
29 import org.w3c.dom.svg.SVGMatrix;
30 import org.w3c.dom.svg.SVGRect;
31
32
38 public class SVGLocatableSupport {
39
42 public SVGLocatableSupport() {
43 }
44
45
49 public static SVGElement getNearestViewportElement(Element e) {
50 Element elt = e;
51 while (elt != null) {
52 elt = SVGCSSEngine.getParentCSSStylableElement(elt);
53 if (elt instanceof SVGFitToViewBox) {
54 break;
55 }
56 }
57 return (SVGElement)elt;
58 }
59
60
64 public static SVGElement getFarthestViewportElement(Element elt) {
65 return (SVGElement)elt.getOwnerDocument().getDocumentElement();
66 }
67
68
71 public static SVGRect getBBox(Element elt) {
72 final SVGOMElement svgelt = (SVGOMElement)elt;
73 SVGContext svgctx = svgelt.getSVGContext();
74 if (svgctx == null) return null;
75 if (svgctx.getBBox() == null) return null;
76
77 return new SVGRect() {
78 public float getX() {
79 return (float)svgelt.getSVGContext().getBBox().getX();
80 }
81 public void setX(float x) throws DOMException {
82 throw svgelt.createDOMException
83 (DOMException.NO_MODIFICATION_ALLOWED_ERR,
84 "readonly.rect", null);
85 }
86 public float getY() {
87 return (float)svgelt.getSVGContext().getBBox().getY();
88 }
89 public void setY(float y) throws DOMException {
90 throw svgelt.createDOMException
91 (DOMException.NO_MODIFICATION_ALLOWED_ERR,
92 "readonly.rect", null);
93 }
94 public float getWidth() {
95 return (float)svgelt.getSVGContext().getBBox().getWidth();
96 }
97 public void setWidth(float width) throws DOMException {
98 throw svgelt.createDOMException
99 (DOMException.NO_MODIFICATION_ALLOWED_ERR,
100 "readonly.rect", null);
101 }
102 public float getHeight() {
103 return (float)svgelt.getSVGContext().getBBox().getHeight();
104 }
105 public void setHeight(float height) throws DOMException {
106 throw svgelt.createDOMException
107 (DOMException.NO_MODIFICATION_ALLOWED_ERR,
108 "readonly.rect", null);
109 }
110 };
111 }
112
113
116 public static SVGMatrix getCTM(Element elt) {
117 final SVGOMElement svgelt = (SVGOMElement)elt;
118 return new AbstractSVGMatrix() {
119 protected AffineTransform getAffineTransform() {
120 return svgelt.getSVGContext().getCTM();
121 }
122 };
123 }
124
125
128 public static SVGMatrix getScreenCTM(Element elt) {
129 final SVGOMElement svgelt = (SVGOMElement)elt;
130 return new AbstractSVGMatrix() {
131 protected AffineTransform getAffineTransform() {
132 SVGContext context = svgelt.getSVGContext();
133 AffineTransform ret = context.getGlobalTransform();
134 AffineTransform scrnTrans = context.getScreenTransform();
135 if (scrnTrans != null)
136 ret.preConcatenate(scrnTrans);
137 return ret;
138 }
139 };
140 }
141
142
146 public static SVGMatrix getTransformToElement(Element elt,
147 SVGElement element)
148 throws SVGException {
149 final SVGOMElement currentElt = (SVGOMElement)elt;
150 final SVGOMElement targetElt = (SVGOMElement)element;
151 return new AbstractSVGMatrix() {
152 protected AffineTransform getAffineTransform() {
153 AffineTransform cat =
154 currentElt.getSVGContext().getGlobalTransform();
155 if (cat == null) {
156 cat = new AffineTransform ();
157 }
158 AffineTransform tat =
159 targetElt.getSVGContext().getGlobalTransform();
160 if (tat == null) {
161 tat = new AffineTransform ();
162 }
163 AffineTransform at = new AffineTransform (cat);
164 try {
165 at.preConcatenate(tat.createInverse());
166 return at;
167 } catch (NoninvertibleTransformException ex) {
168 throw currentElt.createSVGException
169 (SVGException.SVG_MATRIX_NOT_INVERTABLE,
170 "noninvertiblematrix",
171 null);
172 }
173 }
174 };
175 }
176 }
177 |
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