a utility file for creating some svg things

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@194345 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/src/org/apache/fop/svg/SVGUtilities.java b/src/org/apache/fop/svg/SVGUtilities.java
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+++ b/src/org/apache/fop/svg/SVGUtilities.java
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+/* $Id$
+ * Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
+ * For details on use and redistribution please refer to the
+ * LICENSE file included with these sources.
+ */
+
+package org.apache.fop.svg;
+
+import java.util.*;
+import java.text.*;
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Rectangle2D;
+import java.awt.font.FontRenderContext;
+
+import org.apache.fop.fo.*;
+import org.apache.fop.fo.properties.*;
+import org.apache.fop.layout.*;
+import org.apache.fop.apps.*;
+import org.apache.fop.datatypes.*;
+import org.apache.fop.layout.inline.*;
+import org.apache.fop.svg.*;
+import org.w3c.dom.*;
+import org.w3c.dom.svg.*;
+import org.w3c.dom.css.*;
+
+import org.apache.batik.dom.svg.SVGDOMImplementation;
+
+/**
+ * Some utilities for creating svg DOM documents and elements.
+ */
+public class SVGUtilities {
+    final static String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
+
+
+    public static final Document createSVGDocument(float width,
+            float height) {
+        DOMImplementation impl =
+          SVGDOMImplementation.getDOMImplementation();
+        Document doc = impl.createDocument(svgNS, "svg", null);
+
+        Element svgRoot = doc.getDocumentElement();
+        svgRoot.setAttributeNS(null, "width", "" + width);
+        svgRoot.setAttributeNS(null, "height", "" + height);
+        return doc;
+    }
+
+    /**
+     * Get the string width for a particular string given the font.
+     */
+    public static final float getStringWidth(String str,
+            java.awt.Font font) {
+        Rectangle2D rect = font.getStringBounds(str, 0, str.length(),
+                                                new FontRenderContext(new AffineTransform(), true, true));
+        return (float) rect.getWidth();
+    }
+
+    /**
+     * Get the string height for a particular string given the font.
+     */
+    public static final float getStringHeight(String str,
+            java.awt.Font font) {
+        Rectangle2D rect = font.getStringBounds(str, 0, str.length(),
+                                                new FontRenderContext(new AffineTransform(), true, true));
+        return (float) rect.getHeight();
+    }
+
+    /**
+     * Get the string bounds for a particular string given the font.
+     */
+    public static final Rectangle2D getStringBounds(String str,
+            java.awt.Font font) {
+        return font.getStringBounds(str, 0, str.length(),
+                                    new FontRenderContext(new AffineTransform(), true, true));
+    }
+
+    /**
+     * Create an SVG Line
+     */
+    public static final Element createLine(Document doc, float x,
+                                           float y, float x2, float y2) {
+        Element ellipse = doc.createElementNS(svgNS, "line");
+        ellipse.setAttributeNS(null, "x1", "" + x);
+        ellipse.setAttributeNS(null, "x2", "" + x2);
+        ellipse.setAttributeNS(null, "y1", "" + y);
+        ellipse.setAttributeNS(null, "y2", "" + y2);
+        return ellipse;
+    }
+
+    /**
+     * Create an SVG Ellipse
+     */
+    public static final Element createEllipse(Document doc, float cx,
+            float cy, float rx, float ry) {
+        Element ellipse = doc.createElementNS(svgNS, "ellipse");
+        ellipse.setAttributeNS(null, "cx", "" + cx);
+        ellipse.setAttributeNS(null, "rx", "" + rx);
+        ellipse.setAttributeNS(null, "cy", "" + cy);
+        ellipse.setAttributeNS(null, "ry", "" + ry);
+        return ellipse;
+    }
+
+    /**
+     * Create an SVG Path.
+     */
+    public static final Element createPath(Document doc, String str) {
+        Element path = doc.createElementNS(svgNS, "path");
+        path.setAttributeNS(null, "d", str);
+        return path;
+    }
+
+    /**
+     * Create an SVG Text object.
+     */
+    public static final Element createText(Document doc, float x,
+                                           float y, String str) {
+        Element textGraph = doc.createElementNS(svgNS, "text");
+        textGraph.setAttributeNS(null, "x", "" + x);
+        textGraph.setAttributeNS(null, "y", "" + y);
+        org.w3c.dom.Text text = doc.createTextNode(str);
+        textGraph.appendChild(text);
+        return textGraph;
+    }
+
+    /**
+     * Create an SVG Rectangle.
+     */
+    public static final Element createRect(Document doc, float x,
+                                           float y, float width, float height) {
+        Element border = doc.createElementNS(svgNS, "rect");
+        border.setAttributeNS(null, "x", "" + x);
+        border.setAttributeNS(null, "y", "" + y);
+        border.setAttributeNS(null, "width", "" + width);
+        border.setAttributeNS(null, "height", "" + height);
+        return border;
+    }
+
+    /**
+     * Create an SVG G.
+     */
+    public static final Element createG(Document doc) {
+        Element border = doc.createElementNS(svgNS, "g");
+        return border;
+    }
+
+    /**
+     * Create an SVG Clip.
+     */
+    public static final Element createClip(Document doc, Element els,
+                                           String id) {
+        Element border = doc.createElementNS(svgNS, "clipPath");
+        border.setAttributeNS(null, "id", id);
+        border.appendChild(els);
+        return border;
+    }
+
+    public static final Element createImage(Document doc, String ref,
+                                            float width, float height) {
+        Element border = doc.createElementNS(svgNS, "image");
+        border.setAttributeNS("http://www.w3.org/1999/xlink", "xlink:href",
+                              ref);
+        border.setAttributeNS(null, "width", "" + width);
+        border.setAttributeNS(null, "height", "" + height);
+        return border;
+    }
+
+    /**
+     * Create some SVG text that is wrapped into a specified width..
+     */
+    public static final Element wrapText(Document doc, String str,
+                                         java.awt.Font font, float width) {
+        Element g = createG(doc);
+        Element text;
+        StringTokenizer st = new StringTokenizer(str, " \t\r\n");
+        float totalWidth = 0;
+        String totalStr = "";
+        int line = 0;
+        float height = getStringHeight(str, font);
+        while (st.hasMoreTokens()) {
+            String token = st.nextToken();
+            float strwidth = getStringWidth(token, font);
+            totalWidth += strwidth;
+            if (totalWidth > width) {
+                if (totalStr.equals("")) {
+                    totalStr = token;
+                    token = "";
+                    strwidth = 0;
+                }
+                text = createText(doc, 0, line * (height + 5), totalStr);
+                g.appendChild(text);
+                totalStr = token;
+                totalWidth = strwidth;
+                line++;
+            } else {
+                totalStr = totalStr + " " + token;
+            }
+        }
+
+        return g;
+    }
+}