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14 lines
458 B
14 lines
458 B
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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