applications of computer graphics

When creating a window drawing in it, you must also specify the coordinate system to be used and how to map the prepared coordinates to pixels (x * Y) on the physical screen ). The window is measured physically by the number of records. Before painting, you must specify "how to convert a specified coordinate pair to screen coordinates, specify the trim area first (specify the area occupied by the window in the Cartesian coordinate system ). 1. in two-dimensional space, the trim area is the

component MnMn-1 and the translation component Mntn-1+tn during each transformation.Using the four-dimensional transformation, we can unify M and T, and we can create a four-dimensional 4 x 4 matrix to represent the panning operation. The method is to add a coordinate to the 3D point P, and the fourth coordinate of the extension is called the W coordinate, and its value is set to 1.(6)Multiplying the matrix F by the vector (px,py,pz,1) is equivalent to (4) transforming the x, Y, z coordinates o

#include 　　Computer graphics-code_2

this point, each processor calculates the intersection coordinates of a curve and a scan line based on the circle or ellipse equation. for . Each processor applies a curve equation to determine the location of the intersection with the scan line for which it is set. After assigning a set of pixels to each processor, the processor calculates the distance (or square of the distance) of each pixel to the curve. If the calculated distance is less than the pre-specified value, the pixel is dra

, int radius, int color){int x = 0;int y = radius;int delta = (1-radius);int direction;while (y >= 0) {Putpixel (centerx+x, centery+y, color);Putpixel (centerx-x, centery+y, color);Putpixel (centerx-x, centery-y, color);Putpixel (centerx+x, centery-y, color);if (Delta if ((delta+y)-1) Direction = 1;}else {Direction = 2;}}else if (Delta > 0) {if ((delta-x)-1) Direction = 2;}else {Direction = 3;}}else {direction=2;}switch (direction) {Case 1:x + +;Delta + = (2*x+1);BreakCase 2:x + +;y--;Delta + =

Draw circle algorithm and the position along the circle path areThe procedure for implementing a midpoint circle algorithm is given in the following section. The RADIUS value and the center coordinate are passed to the procedureCirclemidpoint. It then calculates a pixel position on the first eight-point circle and passes it to the procedure circleplotpoints. The process throughthe SetPixel function is called over and over repeatedly to set the color of the circle in the frame cache, and all pix

value of the initial decision parameter number isCalculates the increment of subsequent decision parameters toThe pixel points generated along this line path are shown in Figure 3.12.The implementation of the Bresenham line algorithm with slope 0 #include by considering the symmetry between the eight and four regions of the XY plane, the Bresenham algorithm is universal for any slope segment. For a line segment with a positive slope and greater than 1.0, as long as the rules for the X and Y dir

-point increment, the accumulation of rounding error causes the pixel position calculated for the longer segment to deviate from the actual segment. And the rounding and floating-point operations in the process are still time consuming. We can improve the performance of the DDA algorithm by separating the increment m and 1/m into integers and fractional parts, so that all calculations are simplified to integer operations. The method of calculating 1/m increments with integer steps is discussed l

parameter Rx and ryUsing polar coordinates: R and θ, you can also describe a standard position ellipse in the form of a parametric equation:Θ, called an elliptical centrifugal angle (eccentricangle), is measured along the circumference of its enclosing circle. If rx> ry, the radius of the enclosing circle is R = Rx (see figure 3.23), otherwise the radius of the enclosing circle is R = RyAs with the circle algorithm, considering the symmetry of the ellipse can further reduce the computational am

Step 1: Search for related functions and learn about their functions and calls 69951068 77534803 50216979 midpoint draw Method Simple metacode: # Include Dot line algorithm code: # Include 　　 The first experiment of computer graphics

An overview of the corresponding site for http://www.cs.unm.edu/~angel/, the site can get code code;Usage precautions: When the JS file contains the following codemeans that you need to put the common folder on the site in the right place for access, that is, a directory above the JS file levelInteractive computer graphics (WebGL based) Resource usage