pixi.js
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16 lines (13 loc) • 366 B
JavaScript
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function calculateProjection(pm, x, y, width, height, flipY) {
const sign = flipY ? 1 : -1;
pm.identity();
pm.a = 1 / width * 2;
pm.d = sign * (1 / height * 2);
pm.tx = -1 - x * pm.a;
pm.ty = -sign - y * pm.d;
return pm;
}
exports.calculateProjection = calculateProjection;
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