diff options
Diffstat (limited to 'src/main/java/com/kitfox/svg/animation/AnimateMotion.java')
| -rw-r--r-- | src/main/java/com/kitfox/svg/animation/AnimateMotion.java | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/src/main/java/com/kitfox/svg/animation/AnimateMotion.java b/src/main/java/com/kitfox/svg/animation/AnimateMotion.java new file mode 100644 index 0000000..c96f45e --- /dev/null +++ b/src/main/java/com/kitfox/svg/animation/AnimateMotion.java @@ -0,0 +1,234 @@ +/*
+ * Animate.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 August 15, 2004, 2:51 AM
+ */
+
+package com.kitfox.svg.animation;
+
+import org.xml.sax.*;
+import java.util.regex.*;
+import java.awt.geom.*;
+import java.awt.*;
+import java.util.*;
+
+import com.kitfox.svg.*;
+
+/**
+ * @author Mark McKay
+ * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
+ */
+public class AnimateMotion extends AnimateXform
+{
+ static final Matcher matchPoint = Pattern.compile("\\s*(\\d+)[^\\d]+(\\d+)\\s*").matcher("");
+
+// protected double fromValue;
+// protected double toValue;
+ GeneralPath path;
+ int rotateType = RT_ANGLE;
+ double rotate; //Static angle to rotate by
+
+ public static final int RT_ANGLE = 0; //Rotate by constant 'rotate' degrees
+ public static final int RT_AUTO = 1; //Rotate to reflect tangent of position on path
+
+ final Vector bezierSegs = new Vector();
+ double curveLength;
+
+ /** Creates a new instance of Animate */
+ public AnimateMotion()
+ {
+ }
+
+ public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent) throws SAXException
+ {
+ //Load style string
+ super.loaderStartElement(helper, attrs, parent);
+
+ //Motion element implies animating the transform element
+ if (attribName == null)
+ {
+ attribName = "transform";
+ attribType = AT_AUTO;
+ additiveType = AD_SUM;
+ }
+
+
+ //Determine path
+ String from = attrs.getValue("from");
+ String to = attrs.getValue("to");
+ if (from != null && to != null)
+ {
+ Point2D.Float ptFrom = new Point2D.Float(), ptTo = new Point2D.Float();
+
+ matchPoint.reset(from);
+ if (matchPoint.matches())
+ {
+ setPoint(ptFrom, matchPoint.group(1), matchPoint.group(2));
+ }
+
+ matchPoint.reset(to);
+ if (matchPoint.matches())
+ {
+ setPoint(ptFrom, matchPoint.group(1), matchPoint.group(2));
+ }
+
+ if (ptFrom != null && ptTo != null)
+ {
+ path = new GeneralPath();
+ path.moveTo(ptFrom.x, ptFrom.y);
+ path.lineTo(ptTo.x, ptTo.y);
+ }
+ }
+
+ String path = attrs.getValue("path");
+ if (path != null)
+ {
+ this.path = buildPath(path, GeneralPath.WIND_NON_ZERO);
+ }
+
+ //Now parse rotation style
+ String rotate = attrs.getValue("rotate");
+ if (rotate != null)
+ {
+ if (rotate.equals("auto"))
+ {
+ this.rotateType = RT_AUTO;
+ }
+ else
+ {
+ try { this.rotate = Math.toRadians(Float.parseFloat(rotate)); } catch (Exception e) {}
+ }
+ }
+
+ paramaterizePath();
+ }
+
+ protected static void setPoint(Point2D.Float pt, String x, String y)
+ {
+ try { pt.x = Float.parseFloat(x); } catch (Exception e) {};
+
+ try { pt.y = Float.parseFloat(y); } catch (Exception e) {};
+ }
+
+
+ private void paramaterizePath()
+ {
+ bezierSegs.clear();
+ curveLength = 0;
+
+ double[] coords = new double[6];
+ double sx = 0, sy = 0;
+
+ for (PathIterator pathIt = path.getPathIterator(new AffineTransform()); !pathIt.isDone(); pathIt.next())
+ {
+ Bezier bezier = null;
+
+ int segType = pathIt.currentSegment(coords);
+
+ switch (segType)
+ {
+ case PathIterator.SEG_LINETO:
+ {
+ bezier = new Bezier(sx, sy, coords, 1);
+ sx = coords[0];
+ sy = coords[1];
+ break;
+ }
+ case PathIterator.SEG_QUADTO:
+ {
+ bezier = new Bezier(sx, sy, coords, 2);
+ sx = coords[2];
+ sy = coords[3];
+ break;
+ }
+ case PathIterator.SEG_CUBICTO:
+ {
+ bezier = new Bezier(sx, sy, coords, 3);
+ sx = coords[4];
+ sy = coords[5];
+ break;
+ }
+ case PathIterator.SEG_MOVETO:
+ {
+ sx = coords[0];
+ sy = coords[1];
+ break;
+ }
+ case PathIterator.SEG_CLOSE:
+ //Do nothing
+ break;
+
+ }
+
+ if (bezier != null)
+ {
+ bezierSegs.add(bezier);
+ curveLength += bezier.getLength();
+ }
+ }
+ }
+
+ /**
+ * Evaluates this animation element for the passed interpolation time. Interp
+ * must be on [0..1].
+ */
+ public AffineTransform eval(AffineTransform xform, double interp)
+ {
+ Point2D.Double point = new Point2D.Double();
+
+ if (interp >= 1)
+ {
+ Bezier last = (Bezier)bezierSegs.get(bezierSegs.size() - 1);
+ last.getFinalPoint(point);
+ xform.setToTranslation(point.x, point.y);
+ return xform;
+ }
+
+ double curLength = curveLength * interp;
+ for (Iterator it = bezierSegs.iterator(); it.hasNext();)
+ {
+ Bezier bez = (Bezier)it.next();
+
+ double bezLength = bez.getLength();
+ if (curLength < bezLength)
+ {
+ double param = curLength / bezLength;
+ bez.eval(param, point);
+ break;
+ }
+
+ curLength -= bezLength;
+ }
+
+ xform.setToTranslation(point.x, point.y);
+
+ return xform;
+ }
+
+ public static void main(String[] argv)
+ {
+ AnimateMotion a = new AnimateMotion();
+ a.path = buildPath("M0 0 L-400, 0", GeneralPath.WIND_NON_ZERO);
+ a.paramaterizePath();
+ }
+}
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