Two-dimensional Transformations

Abstract

If you have read the previous chapters carefully, then you should be able to create a wide variety of images on the screen. Such patterns are constructed using one of the several different techniques already described. The images thus created are, however, fixed at a particular position on the screen and their overall shape cannot readily be altered. In this chapter we shall see how, once an image has been created, it can be manipulated, without building it anew. The topics covered here include, among others, translation, scaling, rotation and clipping. These are the fundamental concepts that enable you to manipulate existing images.