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[libgdx] SutherlandHodgman assumes clip area is given clockwise

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This commit is contained in:
badlogic 2017-03-28 17:27:19 +02:00
parent d368deb999
commit 687a3ade7b
2 changed files with 20 additions and 11 deletions
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3
spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonRenderer.java
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@ -394,6 +394,9 @@ public class SkeletonRenderer {
float[] vertices = this.clippingArea.setSize(n);
clip.computeWorldVertices(slot, 0, n, vertices, 0, 2);
clippingAreaClockwise = SutherlandHodgmanClipper.clockwise(this.clippingArea);
if (!clippingAreaClockwise) {
SutherlandHodgmanClipper.makeClockwise(clippingArea);
}
clippingArea.add(clippingArea.items[0]);
clippingArea.add(clippingArea.items[1]);
}

28
spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/utils/SutherlandHodgmanClipper.java
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@ -6,7 +6,7 @@ import com.badlogic.gdx.utils.FloatArray;
public class SutherlandHodgmanClipper {
final FloatArray scratch = new FloatArray();
/** Clips the input triangle against the convex clipping area. If the triangle lies entirely within the clipping area, false is
/** Clips the input triangle against the convex clipping area, which needs to be clockwise. If the triangle lies entirely within the clipping area, false is
* returned. The clipping area must duplicate the first vertex at the end of the vertices list! */
public boolean clip (float x1, float y1, float x2, float y2, float x3, float y3, FloatArray clippingArea, FloatArray output,
boolean isClockwise) {
@ -41,16 +41,6 @@ public class SutherlandHodgmanClipper {
float edgeX2 = clippingVertices[i + 2];
float edgeY2 = clippingVertices[i + 3];
if (!isClockwise) {
float tmp = edgeX;
edgeX = edgeX2;
edgeX2 = tmp;
tmp = edgeY;
edgeY = edgeY2;
edgeY2 = tmp;
}
final float deltaX = edgeX - edgeX2;
final float deltaY = edgeY - edgeY2;
@ -126,6 +116,22 @@ public class SutherlandHodgmanClipper {
output.add(x1 + (x2 - x1) * ua);
output.add(y1 + (y2 - y1) * ua);
}
public static void makeClockwise (FloatArray poly) {
if (clockwise(poly)) return;
int lastX = poly.size - 2;
final float[] polygon = poly.items;
for (int i = 0, n = poly.size / 2; i < n; i += 2) {
int other = lastX - i;
float x = polygon[i];
float y = polygon[i + 1];
polygon[i] = polygon[other];
polygon[i + 1] = polygon[other + 1];
polygon[other] = x;
polygon[other + 1] = y;
}
}
public static boolean clockwise (FloatArray poly) {
return area(poly) < 0;