Initial 1.7 commit

codechicken/lib/render/uv/UVRotation.java

@@ -0,0 +1,53 @@
+package codechicken.lib.render.uv;
+
+import codechicken.lib.math.MathHelper;
+
+import java.math.BigDecimal;
+import java.math.MathContext;
+import java.math.RoundingMode;
+
+public class UVRotation extends UVTransformation
+{
+    public double angle;
+
+    /**
+     * @param angle The angle to rotate counterclockwise in radians
+     */
+    public UVRotation(double angle) {
+        this.angle = angle;
+    }
+
+    @Override
+    public void apply(UV uv) {
+        double c = MathHelper.cos(angle);
+        double s = MathHelper.sin(angle);
+        double u2 = c*uv.u + s*uv.v;
+        uv.v = - s*uv.u + c*uv.v;
+        uv.u = u2;
+    }
+
+    @Override
+    public UVTransformation inverse() {
+        return new UVRotation(-angle);
+    }
+
+    @Override
+    public UVTransformation merge(UVTransformation next) {
+        if(next instanceof UVRotation)
+            return new UVRotation(angle+((UVRotation)next).angle);
+
+        return null;
+    }
+
+    @Override
+    public boolean isRedundant() {
+        return MathHelper.between(-1E-5, angle, 1E-5);
+    }
+
+    @Override
+    public String toString()
+    {
+        MathContext cont = new MathContext(4, RoundingMode.HALF_UP);
+        return "UVRotation(" + new BigDecimal(angle, cont) + ")";
+    }
+}