## Canvas

With the help of a `GC` it is possible to draw on a `Canvas` widget. The usual functions like dots, lines, (rounded) rectangles, ovals, polylines, arcs, text and images are supported. All shapes can be outlined or (when closed) filled with any color and opacity.

Try the example on the left. The controls at the bottom are:

Polyform
  Click on several points in the drawing area to draw a polyline. Close and fill the shape by clicking on the starting point.
Oval
  Click to define the center, click once more to define the radius.
Stamp
  Click once to draw an image into the area.
Transparency
  Draw semi-transparent shapes.
Clear
  Clears the drawing area.