Setting the brush tool to transparent color makes it act just like the eraser tool in the bitmap paint editor.
This functionality could be extended to the other tools (erase in the shape of a line, rectangle, or circle), but instead, the transparent swatch is missing in the line, oval, and rectangle tools, and setting the color to transparent manually causes them to draw in black, which is unexpected and possibly a bug.
Setting the brush tool to transparent color makes it act just like the eraser tool in the bitmap paint editor.
This functionality could be extended to the other tools (erase in the shape of a line, rectangle, or circle), but instead, the transparent swatch is missing in the line, oval, and rectangle tools, and setting the color to transparent manually causes them to draw in black, which is unexpected and possibly a bug.