Using Pens

Go Up to Using the Properties of the Canvas Object

The Pen property of a canvas controls the way lines appear, including lines drawn as the outlines of shapes. Drawing a straight line is really just changing a group of pixels that lie between two points.

The pen itself has four properties you can change:

• The Color property changes the pen color.
• The Width property changes the pen width.
• The Style property changes the pen style.
• The Mode property changes the pen mode.

The values of these properties determine how the pen changes the pixels in the line. By default, every pen starts out black, with a width of 1 pixel, a solid style, and a mode called copy that overwrites anything already on the canvas.

You can use Vcl.Graphics.TPenRecall for quick saving off and restoring the properties of pens.

See Also

• Changing the Pen Color
• Changing the Pen Width
• Changing the Pen Style
• Changing the Pen Mode
• Getting the Pen Position
• Using Brushes
• Reading and Setting Pixels