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[haxe] Ported clipping fixes for colinear points (a0caef6 and 932c33a). See #2546.

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This commit is contained in:
Davide Tantillo 2024-06-11 14:42:45 +02:00
parent 5c0cf0af45
commit 9f42570868
1 changed files with 35 additions and 38 deletions
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77
spine-haxe/spine-haxe/spine/SkeletonClipping.hx
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@ -88,7 +88,6 @@ class SkeletonClipping {
var polygonsCount:Int = clippingPolygons.length;
var index:Int = 0;
clippedVertices.resize(0);
clippedUvs.resize(0);
clippedTriangles.resize(0);
var i:Int = 0;
while (i < trianglesLength) {
@ -301,67 +300,65 @@ class SkeletonClipping {
input.push(y1);
output.resize(0);
var clippingVertices:Array<Float> = clippingArea;
var clippingVerticesLast:Int = clippingArea.length - 4;
var c0:Float, c2:Float, s:Float, ua:Float;
var clippingVertices:Array<Float> = clippingArea;
var ix:Float, iy:Float, t:Float;
var i:Int = 0;
var n:Int = 0;
while (true) {
var edgeX:Float = clippingVertices[i],
edgeY:Float = clippingVertices[i + 1];
var edgeX2:Float = clippingVertices[i + 2],
edgeY2:Float = clippingVertices[i + 3];
var deltaX:Float = edgeX - edgeX2, deltaY:Float = edgeY - edgeY2;
var ex:Float = edgeX - clippingVertices[i + 2],
ey:Float = edgeY - clippingVertices[i + 3];
var outputStart:Int = output.length;
var inputVertices:Array<Float> = input;
var inputVerticesLength:Int = input.length - 2,
outputStart:Int = output.length;
var ii:Int = 0;
while (ii < inputVerticesLength) {
var nn:Int = input.length - 2;
while (ii < nn) {
var inputX:Float = inputVertices[ii],
inputY:Float = inputVertices[ii + 1];
var inputX2:Float = inputVertices[ii + 2],
inputY2:Float = inputVertices[ii + 3];
var side2:Bool = deltaX * (inputY2 - edgeY2) - deltaY * (inputX2 - edgeX2) > 0;
if (deltaX * (inputY - edgeY2) - deltaY * (inputX - edgeX2) > 0) {
if (side2) {
ii += 2;
var inputX2:Float = inputVertices[ii],
inputY2:Float = inputVertices[ii + 1];
var s2:Bool = ey * (edgeX - inputX2) > ex * (edgeY - inputY2);
var s1:Float = ey * (edgeX - inputX) - ex * (edgeY - inputY);
if (s1 > 0) {
if (s2) {
// v1 inside, v2 inside
output.push(inputX2);
output.push(inputY2);
ii += 2;
continue;
}
// v1 inside, v2 outside
c0 = inputY2 - inputY;
c2 = inputX2 - inputX;
s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (Math.abs(s) > 0.000001) {
ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
output.push(edgeX + (edgeX2 - edgeX) * ua);
output.push(edgeY + (edgeY2 - edgeY) * ua);
ix = inputX2 - inputX;
iy = inputY2 - inputY;
t = s1 / (ix * ey - iy * ex);
if (t >= 0 && t <= 1) {
output.push(inputX + ix * t);
output.push(inputY + iy * t);
} else {
output.push(edgeX);
output.push(edgeY);
}
} else if (side2) {
// v1 outside, v2 inside
c0 = inputY2 - inputY;
c2 = inputX2 - inputX;
s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
if (Math.abs(s) > 0.000001) {
ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
output.push(edgeX + (edgeX2 - edgeX) * ua);
output.push(edgeY + (edgeY2 - edgeY) * ua);
} else {
output.push(edgeX);
output.push(edgeY);
}
output.push(inputX2);
output.push(inputY2);
continue;
}
} else if (s2) {
// v1 outside, v2 inside
ix = inputX2 - inputX;
iy = inputY2 - inputY;
t = s1 / (ix * ey - iy * ex);
if (t >= 0 && t <= 1) {
output.push(inputX + ix * t);
output.push(inputY + iy * t);
output.push(inputX2);
output.push(inputY2);
} else {
output.push(inputX2);
output.push(inputY2);
continue;
}
}
clipped = true;
ii += 2;
}
if (outputStart == output.length) {