From b85982e025ee1d45a7a9873f5809ed45f3412201 Mon Sep 17 00:00:00 2001
From: kitfox
Date: Sat, 29 Sep 2012 06:49:32 +0000
Subject: AnimateTransform can now handle short parameter lists.

git-svn-id: https://svn.java.net/svn/svgsalamander~svn/trunk/svg-core@127 7dc7fa77-23fb-e6ad-8e2e-c86bd48ed22b
---
 src/main/java/com/kitfox/svg/SVGElement.java       |  5 ++++
 .../com/kitfox/svg/animation/AnimateTransform.java | 29 +++++++++++++++-------
 2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/src/main/java/com/kitfox/svg/SVGElement.java b/src/main/java/com/kitfox/svg/SVGElement.java
index 4375a89..5f849a4 100644
--- a/src/main/java/com/kitfox/svg/SVGElement.java
+++ b/src/main/java/com/kitfox/svg/SVGElement.java
@@ -897,4 +897,9 @@ abstract public class SVGElement implements Serializable
         return (SVGElement)children.get(i);
     }
     
+    public double lerp(double t0, double t1, double alpha)
+    {
+        return (1 - alpha) * t0 + alpha * t1;
+    }
+        
 }
diff --git a/src/main/java/com/kitfox/svg/animation/AnimateTransform.java b/src/main/java/com/kitfox/svg/animation/AnimateTransform.java
index 61d73b2..14e39c2 100644
--- a/src/main/java/com/kitfox/svg/animation/AnimateTransform.java
+++ b/src/main/java/com/kitfox/svg/animation/AnimateTransform.java
@@ -182,8 +182,14 @@ public class AnimateTransform extends AnimateXform
         {
             case TR_TRANSLATE:
             {
-                double x = (1.0 - interp) * fromValue[0] + interp * toValue[0];
-                double y = (1.0 - interp) * fromValue[1] + interp * toValue[1];
+                double x0 = fromValue.length > 1 ? fromValue[0] : 0;
+                double x1 = toValue.length > 1 ? toValue[0] : 0;
+                double y0 = fromValue.length > 2 ? fromValue[1] : 0;
+                double y1 = toValue.length > 2 ? toValue[1] : 0;
+                
+                double x = lerp(x0, x1, interp);
+                double y = lerp(y0, y1, interp);
+                
                 xform.setToTranslation(x, y);
                 break;
             }
@@ -194,28 +200,33 @@ public class AnimateTransform extends AnimateXform
                 double x2 = toValue.length == 3 ? toValue[1] : 0;
                 double y2 = toValue.length == 3 ? toValue[2] : 0;
                 
-                double theta = (1.0 - interp) * fromValue[0] + interp * toValue[0];
-                double x = (1.0 - interp) * x1 + interp * x2;
-                double y = (1.0 - interp) * y1 + interp * y2;
+                double theta = lerp(fromValue[0], toValue[0], interp);
+                double x = lerp(x1, x2, interp);
+                double y = lerp(y1, y2, interp);
                 xform.setToRotation(Math.toRadians(theta), x, y);
                 break;
             }
             case TR_SCALE:
             {
-                double x = (1.0 - interp) * fromValue[0] + interp * toValue[0];
-                double y = (1.0 - interp) * fromValue[1] + interp * toValue[1];
+                double x0 = fromValue.length > 1 ? fromValue[0] : 1;
+                double x1 = toValue.length > 1 ? toValue[0] : 1;
+                double y0 = fromValue.length > 2 ? fromValue[1] : 1;
+                double y1 = toValue.length > 2 ? toValue[1] : 1;
+                
+                double x = lerp(x0, x1, interp);
+                double y = lerp(y0, y1, interp);
                 xform.setToScale(x, y);
                 break;
             }
             case TR_SKEWX:
             {
-                double x = (1.0 - interp) * fromValue[0] + interp * toValue[0];
+                double x = lerp(fromValue[0], toValue[0], interp);
                 xform.setToShear(Math.toRadians(x), 0.0);
                 break;
             }
             case TR_SKEWY:
             {
-                double y = (1.0 - interp) * fromValue[0] + interp * toValue[0];
+                double y = lerp(fromValue[0], toValue[0], interp);
                 xform.setToShear(0.0, Math.toRadians(y));
                 break;
             }
-- 
cgit v1.2.3-55-g7522