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mediump float circleX = (qt_TexCoord0.x - center.x);
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mediump float circleY = (qt_TexCoord0.y - center.y);
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mediump float distanceToCenter = circleX*circleX + circleY*circleY;
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mediump float angle = atan(-circleX, circleY) + PI;
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mediump float radius = 0.5;