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L: Start clicking to continuously draw lines. (No need to drag/hold the mouse key)
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C: Draw a circle by selecting the center and radius. (Again, No need to drag/hold the mouse key).
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R: Draw a rectange by selecting two corners. (Needless to say, there is no need to drag/hold the mouse key)
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U: Undo last action.
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Y: Redo the undone action.
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G: Activate/deactivate grid mode. With gridmode:on, cursur sticks to the grid.
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M: Activate/deactivate magnet mode. With magnetmode:on, curser sticks to the nearest point (if availabe).
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E: Export all points.
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P: Start clicking to draw a polyline. (There is no need to...).
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S: Start clicking to draw a spline. (Like others, no need to drag)
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B: Draw continues quadratic bezier curves.
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X: By holding X button, you can draw a perfect horizontal line (line & polyline only)
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Z: By holding Z button, you can draw a perfect vertical line (line & polyline only)