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12 lines
307 B
Plaintext
12 lines
307 B
Plaintext
function point_rotate(px, py, ox, oy, a) {
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a = angle_difference(a, 0);
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if(a == 0) return [ px, py ];
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if(a == 180) return [ ox + (ox - px), oy + (oy - py) ];
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var cx = px - ox;
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var cy = py - oy;
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var d = -degtorad(a);
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return [ox + cx * cos(d) - cy * sin(d),
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oy + cx * sin(d) + cy * cos(d)];
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} |