hitTest method
ZKSprite?
hitTest(
- dynamic touchX,
- dynamic touchY
)
override
Implementation
@override
ZKSprite? hitTest(touchX, touchY) {
if (frame == null) return null;
var a00 = matrix.a,
a01 = matrix.c,
a02 = matrix.tx,
a10 = matrix.b,
a11 = matrix.d,
a12 = matrix.ty,
id = 1 / (a00 * a11 + a01 * -a10);
var x =
a11 * id * touchX + -a01 * id * touchY + (a12 * a01 - a02 * a11) * id;
var y =
a00 * id * touchY + -a10 * id * touchX + (-a12 * a00 + a02 * a10) * id;
if (MathUtil.inA2B(x, frame!.dstRect!.left, frame!.dstRect!.right) &&
MathUtil.inA2B(y, frame!.dstRect!.top, frame!.dstRect!.bottom)) {
return this;
}
return null;
}