diff options
Diffstat (limited to 'src/main/java/com/kitfox/svg/Gradient.java')
| -rw-r--r-- | src/main/java/com/kitfox/svg/Gradient.java | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/src/main/java/com/kitfox/svg/Gradient.java b/src/main/java/com/kitfox/svg/Gradient.java new file mode 100644 index 0000000..a1336f1 --- /dev/null +++ b/src/main/java/com/kitfox/svg/Gradient.java @@ -0,0 +1,282 @@ +/*
+ * Gradient.java
+ *
+ *
+ * The Salamander Project - 2D and 3D graphics libraries in Java
+ * Copyright (C) 2004 Mark McKay
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Mark McKay can be contacted at mark@kitfox.com. Salamander and other
+ * projects can be found at http://www.kitfox.com
+ *
+ * Created on January 26, 2004, 3:25 AM
+ */
+
+package com.kitfox.svg;
+
+import com.kitfox.svg.xml.StyleAttribute;
+import java.net.*;
+import java.util.*;
+import java.awt.geom.*;
+import java.awt.*;
+
+import com.kitfox.svg.xml.*;
+import org.xml.sax.*;
+
+/**
+ * @author Mark McKay
+ * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
+ */
+abstract public class Gradient extends FillElement
+{
+
+ public static final int SM_PAD = 0;
+ public static final int SM_REPEAT = 1;
+ public static final int SM_REFLECT = 2;
+
+ int spreadMethod = SM_PAD;
+
+ public static final int GU_OBJECT_BOUNDING_BOX = 0;
+ public static final int GU_USER_SPACE_ON_USE = 1;
+
+ protected int gradientUnits = GU_OBJECT_BOUNDING_BOX;
+
+ //Either this gradient contains a list of stops, or it will take it's
+ // stops from the referenced gradient
+ Vector stops = new Vector();
+ Gradient stopRef = null;
+
+ protected AffineTransform gradientTransform = null;
+
+ //Cache arrays of stop values here
+ float[] stopFractions;
+ Color[] stopColors;
+
+ /** Creates a new instance of Gradient */
+ public Gradient() {
+ }
+
+ /**
+ * Called after the start element but before the end element to indicate
+ * each child tag that has been processed
+ */
+ public void loaderAddChild(SVGLoaderHelper helper, SVGElement child) throws SVGElementException
+ {
+ super.loaderAddChild(helper, child);
+
+ if (!(child instanceof Stop)) return;
+ appendStop((Stop)child);
+ }
+
+ protected void build() throws SVGException
+ {
+ super.build();
+
+ StyleAttribute sty = new StyleAttribute();
+ String strn;
+
+ if (getPres(sty.setName("spreadMethod")))
+ {
+ strn = sty.getStringValue().toLowerCase();
+ if (strn.equals("repeat")) spreadMethod = SM_REPEAT;
+ else if (strn.equals("reflect")) spreadMethod = SM_REFLECT;
+ else spreadMethod = SM_PAD;
+ }
+
+ if (getPres(sty.setName("gradientUnits")))
+ {
+ strn = sty.getStringValue().toLowerCase();
+ if (strn.equals("userspaceonuse")) gradientUnits = GU_USER_SPACE_ON_USE;
+ else gradientUnits = GU_OBJECT_BOUNDING_BOX;
+ }
+
+ if (getPres(sty.setName("gradientTransform"))) gradientTransform = parseTransform(sty.getStringValue());
+ //If we still don't have one, set it to identity
+ if (gradientTransform == null) gradientTransform = new AffineTransform();
+
+
+ //Check to see if we're using our own stops or referencing someone else's
+ if (getPres(sty.setName("xlink:href")))
+ {
+ try {
+ URI src = sty.getURIValue(getXMLBase());
+//System.err.println("Gradient: " + sty.getStringValue() + ", " + getXMLBase() + ", " + src);
+// URI src = getXMLBase().resolve(href);
+ stopRef = (Gradient)diagram.getUniverse().getElement(src);
+ }
+ catch (Exception e)
+ {
+ throw new SVGException("Could not resolve relative URL in Gradient: " + sty.getStringValue() + ", " + getXMLBase(), e);
+ }
+ }
+ }
+
+ public float[] getStopFractions()
+ {
+ if (stopRef != null) return stopRef.getStopFractions();
+
+ if (stopFractions != null) return stopFractions;
+
+ stopFractions = new float[stops.size()];
+ int idx = 0;
+ for (Iterator it = stops.iterator(); it.hasNext();)
+ {
+ Stop stop = (Stop)it.next();
+ float val = stop.offset;
+ if (idx != 0 && val < stopFractions[idx - 1]) val = stopFractions[idx - 1];
+ stopFractions[idx++] = val;
+ }
+
+ return stopFractions;
+ }
+
+ public Color[] getStopColors()
+ {
+ if (stopRef != null) return stopRef.getStopColors();
+
+ if (stopColors != null) return stopColors;
+
+ stopColors = new Color[stops.size()];
+ int idx = 0;
+ for (Iterator it = stops.iterator(); it.hasNext();)
+ {
+ Stop stop = (Stop)it.next();
+ int stopColorVal = stop.color.getRGB();
+ Color stopColor = new Color((stopColorVal >> 16) & 0xff, (stopColorVal >> 8) & 0xff, stopColorVal & 0xff, clamp((int)(stop.opacity * 255), 0, 255));
+ stopColors[idx++] = stopColor;
+ }
+
+ return stopColors;
+ }
+
+ public void setStops(Color[] colors, float[] fractions)
+ {
+ if (colors.length != fractions.length)
+ {
+ throw new IllegalArgumentException();
+ }
+
+ this.stopColors = colors;
+ this.stopFractions = fractions;
+ stopRef = null;
+ }
+
+ private int clamp(int val, int min, int max)
+ {
+ if (val < min) return min;
+ if (val > max) return max;
+ return val;
+ }
+
+ public void setStopRef(Gradient grad)
+ {
+ stopRef = grad;
+ }
+
+ public void appendStop(Stop stop)
+ {
+ stops.add(stop);
+ }
+
+ /**
+ * Updates all attributes in this diagram associated with a time event.
+ * Ie, all attributes with track information.
+ * @return - true if this node has changed state as a result of the time
+ * update
+ */
+ public boolean updateTime(double curTime) throws SVGException
+ {
+// if (trackManager.getNumTracks() == 0) return false;
+ boolean stateChange = false;
+
+ //Get current values for parameters
+ StyleAttribute sty = new StyleAttribute();
+ boolean shapeChange = false;
+ String strn;
+
+
+ if (getPres(sty.setName("spreadMethod")))
+ {
+ int newVal;
+ strn = sty.getStringValue().toLowerCase();
+ if (strn.equals("repeat")) newVal = SM_REPEAT;
+ else if (strn.equals("reflect")) newVal = SM_REFLECT;
+ else newVal = SM_PAD;
+ if (spreadMethod != newVal)
+ {
+ spreadMethod = newVal;
+ stateChange = true;
+ }
+ }
+
+ if (getPres(sty.setName("gradientUnits")))
+ {
+ int newVal;
+ strn = sty.getStringValue().toLowerCase();
+ if (strn.equals("userspaceonuse")) newVal = GU_USER_SPACE_ON_USE;
+ else newVal = GU_OBJECT_BOUNDING_BOX;
+ if (newVal != gradientUnits)
+ {
+ gradientUnits = newVal;
+ stateChange = true;
+ }
+ }
+
+ if (getPres(sty.setName("gradientTransform")))
+ {
+ AffineTransform newVal = parseTransform(sty.getStringValue());
+ if (newVal != null && newVal.equals(gradientTransform))
+ {
+ gradientTransform = newVal;
+ stateChange = true;
+ }
+ }
+
+
+ //Check to see if we're using our own stops or referencing someone else's
+ if (getPres(sty.setName("xlink:href")))
+ {
+ try {
+ URI src = sty.getURIValue(getXMLBase());
+ Gradient newVal = (Gradient)diagram.getUniverse().getElement(src);
+ if (newVal != stopRef)
+ {
+ stopRef = newVal;
+ stateChange = true;
+ }
+ }
+ catch (Exception e)
+ {
+ e.printStackTrace();
+ }
+ }
+
+ //Check stops, if any
+ for (Iterator it = stops.iterator(); it.hasNext();)
+ {
+ Stop stop = (Stop)it.next();
+ if (stop.updateTime(curTime))
+ {
+ stateChange = true;
+ stopFractions = null;
+ stopColors = null;
+ }
+ }
+
+ return stateChange;
+ }
+
+}
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