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- float W = ( (coord[1].x-coord[0].x)*(coord[2].y-coord[0].y)-(coord[2].x-coord[0].x)*(coord[1].y-coord[0].y) );
- float a = ( (gx-coord[0].x)*(coord[2].y-coord[0].y)-(coord[2].x-coord[0].x)*(gy-coord[0].y) ) / W;
- float b = ( (coord[1].x-coord[0].x)*(gy-coord[0].y)-(coord[1].y-coord[0].y)*(gx-coord[0].x) ) / W;
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