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15 lines
458 B
15 lines
458 B
4 months ago
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function screen_to_canvas(p) {
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// should be called with coordinates obtained from MouseEvent.clientX/clientY * window.devicePixelRatio
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const xc = (p.x - offset.x) / zoom;
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const yc = (p.y - offset.y) / zoom;
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return {'x': xc, 'y': yc};
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}
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function canvas_to_screen(state, p) {
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const xs = (p.x * zoom + offset.x) / window.devicePixelRatio;
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const ys = (p.y * zoom + offset.y) / window.devicePixelRatio;
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return {'x': xs, 'y': ys};
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}
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