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Polygonal selection tool allows for the drawing of any arbitrary polygonal shape. It tracks clicked points in a vector, upon double clicking we finalize the polygon and generate the selection mask. The user can press the escape key during selection to cancel. The mask is generated as follows: - First we calculate the size of the bounding rect needed to hold the polygon - We add 2 pixels to height/width to allow us a 1 pixel border, the polygon will be centered in this bitmap - Draw the polygon into the bitmap via Gfx::Painter, making sure to connect final polygon point to the first to ensure an enclosed shape - Generate a selection mask the size of the bitmap, with all pixels initially selected - Perform a flood fill from (0,0) which is guaranteed to be outside the polygon - For every pixel reached by the flood fill, we clear the selected pixel from the selection mask - Finally we merge the selection mask like other selection tools. |
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