Chapter 5. Graphics Primitives
Pterodactyl
Table of Contents
Pixels and Segments
Shapes
Text
This chapter talks about common shapes and fonts.
Pixels and Segments
Pixels are atoms of an bitmap image. Usually we need to get and set a
color of a certain pixel of the image. Pixels are defined by their
coordinates and colors.
Figure 5.1. Colored Pixels
[http://pterodactyl.l2p.net/images/Pixels.png]
Colored Pixels
Segments of straight lines are defined by coordinates of their ends
and their colors.
Segments of curves need more complex definition. An example of curved
segments is an arc.
Figure 5.2. Line and Curve Segments
[http://pterodactyl.l2p.net/images/Segments.png]
Line and Curve Segments
Shapes
Some shapes, such as rectangles and polygons, are composed of straight
line segments.
Figure 5.3. Rectangles and Polygons
[http://pterodactyl.l2p.net/images/StraightedShapes.png]
Rectangles and Polygons
Some shapes, however, such as circles and ellipses, are curved.
Figure 5.4. Circles and Ellipses
[http://pterodactyl.l2p.net/images/CurvedShapes.png]
Circles and Ellipses
As far as you can see, shapes can be filled with color. Other fillers
are gradients and patterns.
Text
In addition to pixels, segments (see the section called "Pixels and
Segments"), and shapes (see the section called "Shapes") you can add
text to the image as well playing with its position, color, font, etc.
Figure 5.5. Text Samples
[http://pterodactyl.l2p.net/images/Text.png]
Text Samples