bresenham画圆算法代码

Bresenham算法是一种用于绘制圆形的算法，它通过逐步选择圆弧上离目标像素最近的点来进行绘制。这是一个基本的Bresenham画圆算法的代码示例：

void drawCircle(int centerX, int centerY, int radius) {
    int x = 0;
    int y = radius;
    int d = 3 - 2 * radius;

    while (x <= y) {
        drawPixel(centerX + x, centerY + y); // 绘制八分之一圆弧上的点
        drawPixel(centerX + y, centerY + x);
        drawPixel(centerX - x, centerY + y);
        drawPixel(centerX - y, centerY + x);
        drawPixel(centerX + x, centerY - y);
        drawPixel(centerX + y, centerY - x);
        drawPixel(centerX - x, centerY - y);
        drawPixel(centerX - y, centerY - x);

        if (d < 0) {
            d += 4 * x + 6;
        } else {
            d += 4 * (x - y) + 10;
            y--;
        }
        x++;
    }
}

上面的代码假设存在`drawPixel(x, y)`函数用于在指定像素位置(x, y)绘制一个像素点。`centerX`和`centerY`是圆心的坐标，`radius`是圆的半径。