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27 lines
No EOL
416 B
Text
27 lines
No EOL
416 B
Text
function point_rotate(px, py, ox, oy, a, p = undefined) {
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INLINE
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p ??= [ px, py ];
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a = angle_difference(a, 0);
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if(a == 0) {
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p[0] = px;
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p[1] = py;
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return p;
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}
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if(a == 180) {
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p[0] = ox + (ox - px);
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p[1] = oy + (oy - py);
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return p;
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}
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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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p[0] = ox + cx * cos(d) - cy * sin(d);
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p[1] = oy + cx * sin(d) + cy * cos(d);
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return p;
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} |