Question

有没有人知道如果有使用反馈控制和PID过滤器的Bresehham线路算法的修改版本？基本上，该算法只是将误差项放大一半的P反馈控制。我查看了图形宝石系列，Abrash的书，等等还没找到

Answer 1

这是： From Here 。这使用P参数（参见链接顶部显示的伪代码中的步骤）

提供的示例代码是在旧环境中编写的（代码中对TurboC的引用），并包含必须由您编写的函数。例如。 initgraph()，putpixel()等。但算法似乎已完成。

#include <stdio.h>
  #include <conio.h>
  #include <graphics.h>
  #include <math.h>
  #include <dos.h>

  int main() {
        /* request auto detection */
        int gdriver = DETECT, gmode;
        int x1 = 0, y1 = 0, x2, y2;
        int err, x, y, dx, dy, dp, xEnd;
        int twody, twodxdy;

        /* initialize graphic driver */
        initgraph(&gdriver, &gmode, "C:/TURBOC3/BGI");
        err = graphresult();

        if (err != grOk) {
                /* error occurred */
                printf("Graphics Error: %s\n",
                                grapherrormsg(err));
                return 0;
        }

        /* max position in x and y axis */
        x2 = getmaxx();
        y2 = getmaxy();

        /* draws line from (0, 0) to (x2, y2) */
        dx = x2 - x1;
        dy = y2 - y1;

        twody = 2 * dy;
        twodxdy = 2 * (dy - dx);

        dp = twody - dx;

        if (x1 > x2) {
                x = x2;
                y = y2;
                xEnd = x1;
        } else {
                x = x1;
                y = y1;
                xEnd = x2;
        }

        /* put a dot at the position (x, y) */
        putpixel(x, y, WHITE);

        /* calculate x and y successor and plot the points */
        while (x < xEnd) {
                x = x + 1;
                if (dp < 0) {
                        dp = dp + twody;
                } else {
                        y = y + 1;
                        dp = dp + twodxdy;
                }

                /* put a dot at the given position(x, y) */
                putpixel(x, y, WHITE);

                /* sleep for 50 milliseconds */
                delay(50);
        }

        getch();

        /* deallocate memory allocated for graphic screen */
        closegraph();

        return 0;
  }

Bresenham的线绘制算法和PID

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