bresenham算法c++
时间: 2023-11-13 16:54:23 浏览: 48
Bresenham算法是一种用于计算线段的离散化算法,它可以在计算机屏幕上绘制直线。该算法使用整数运算,因此比使用浮点运算的其他算法更快。
以下是Bresenham算法的C++代码实现:
```c++
void drawLine(int x0, int y0, int x1, int y1) {
int dx = abs(x1 - x0);
int dy = abs(y1 - y0);
int sx = (x0 < x1) ? 1 : -1;
int sy = (y0 < y1) ? 1 : -1;
int err = dx - dy;
while (true) {
setPixel(x0, y0);
if (x0 == x1 && y0 == y1) break;
int e2 = 2 * err;
if (e2 > -dy) { err -= dy; x0 += sx; }
if (e2 < dx) { err += dx; y0 += sy; }
}
}
```
其中,`setPixel`是一个用于在屏幕上绘制像素的函数。
相关问题
直线的bresenham算法c++
以下是直线的Bresenham算法的C++实现:
```c++
#include <iostream>
#include <graphics.h>
using namespace std;
void bresenham(int x1, int y1, int x2, int y2) {
int dx = abs(x2 - x1);
int dy = abs(y2 - y1);
int sx = (x1 < x2) ? 1 : -1;
int sy = (y1 < y2) ? 1 : -1;
int err = dx - dy;
while (true) {
putpixel(x1, y1, WHITE);
if (x1 == x2 && y1 == y2) {
break;
}
int e2 = 2 * err;
if (e2 > -dy) {
err -= dy;
x1 += sx;
}
if (e2 < dx) {
err += dx;
y1 += sy;
}
}
}
int main() {
int gd = DETECT, gm;
initgraph(&gd, &gm, "");
bresenham(100, 100, 300, 300);
getch();
closegraph(); return 0;
}
```
bresenham算法画圆c++
Bresenham算法是一种用于在计算机屏幕上绘制线条和圆的算法。下面是使用Bresenham算法绘制圆的C代码示例:
```c
#include<stdio.h>
#include<graphics.h>
void drawCircle(int xc, int yc, int x, int y)
{
putpixel(xc+x, yc+y, WHITE);
putpixel(xc-x, yc+y, WHITE);
putpixel(xc+x, yc-y, WHITE);
putpixel(xc-x, yc-y, WHITE);
putpixel(xc+y, yc+x, WHITE);
putpixel(xc-y, yc+x, WHITE);
putpixel(xc+y, yc-x, WHITE);
putpixel(xc-y, yc-x, WHITE);
}
void bresenhamCircle(int xc, int yc, int r)
{
int x = 0, y = r;
int d = 3 - 2 * r;
while (x <= y)
{
drawCircle(xc, yc, x, y);
if (d <= 0)
{
d = d + 4 * x + 6;
}
else
{
d = d + 4 * (x - y) + 10;
y--;
}
x++;
}
}
int main()
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "");
int xc = 250;
int yc = 250;
int r = 100;
bresenhamCircle(xc, yc, r);
getch();
closegraph();
return 0;
}
```
这段代码使用了`putpixel`函数来绘制像素点,根据Bresenham算法的原理,在每个八分之一圆弧上设置像素点即可完成整个圆的绘制。