c语言图形编程(五、二维图形变换-01)（C programming language graphics (five, two-dimensional graphics transform -01)）.docVIP

c语言图形编程(五、二维图形变换-01)（C programming language graphics (five, two-dimensional graphics transform -01)） The first section of the user coordinate to screen coordinate transformation 1. window to viewport transformation 2. real value to an integer value transform 3. y coordinates transformation direction The 4. aspect ratio transformation The second section 2D geometric transformation A basic transformation 1, the proportion of transformation 2. symmetry transform 3. shear transformation 4. rotation 5. translation Two, a composite transformation 1. composite translation 2. composite ratio 3. composite rotation 4. relative points (XO, yo) the ratio of transformation 5. relative points (XO, yo) rotation From the beginning of this part, has entered a relatively cumbersome graphical programming part, to really understand the graphics programming, the content of this part is to grasp the. In the computer drawing process, often need to make drawing transformation, including 2D graphics and 3D graphics transform transform. This section discusses the two-dimensional graphics transformations, the content transformation, graphical user coordinate to screen coordinate transformation, the proportion of symmetric transformation, shear transformation, rotation transformation, translation transformation and complex transformation etc.. Behind about 2D clipping, namely line clipping and polygon clipping. The first section of the user coordinate to screen coordinate transformation There is a graphical hypothesis of paper, to use the computer to draw it out on the screen. So the first problem is that the coordinate paper graphics is used in the real domain domain in Cartesian coordinates or polar coordinates, called user coordinate system. While the screen coordinates is the Cartesian coordinate system in the integer domain, called the device coordinate system coordinate system. So the user coordinate system through graphic transform to draw on the screen, the transformation of the conten