C++随机数与随机颜色

产生随机数是编程中经常用到的操作，特别在进行初始化的时候需要赋一些随机值。OpenCV也编写了C++的随机数类RNG，关于随机数的解释请看下方链接。

RNG随机数

下方的代码通过RNG获取随机数，得到随机点，进行随机线的绘制。同时颜色也是通过随机数获得。
示例代码：

	Mat canvas = Mat::zeros(Size(512,512), CV_8UC3);
	int w = canvas.cols;
	int h = canvas.rows;
	RNG rng(123456);
	while (true)
	{
		int c = waitKey(100);
		if (c == 27) {
			break;
		}
		int x1 = rng.uniform(0, w);
		int y1 = rng.uniform(0, h);
		int x2 = rng.uniform(0, w);
		int y2 = rng.uniform(0, h);

		int b = rng.uniform(0, 255);
		int g = rng.uniform(0, 255);
		int r = rng.uniform(0, 255);

		canvas = Scalar(0,0,0);
		line(canvas, Point(x1, y1), Point(x2, y2), Scalar(b, g, r), 4, LINE_AA, 0);
		imshow("随机绘制演示", canvas);
	}