C# 解释Graphics的参数

int[] ra = rank();
Graphics g = this.CreateGraphics();
Pen mypen = new Pen(Color.Black);
int iBarWidth = 40;
decimal dw = 1;

for (int i = 0; i < ra.Length; i++)
{
g.DrawRectangle(mypen, (i * iBarWidth) , 600 - Convert.ToInt32((ra[i] * dw)) + 50, 30, Convert.ToInt32((ra[i])));

}
麻烦解释下Graphics中几个参数是什么意思。我的窗体大小是1024*768的，我想在窗体中画点矩形图，要在下面对齐，上面又不至于顶到窗体外面去。这其中的参数如何改？
ra是一组从大到小排列好了的整数。

mypen是画笔 ,可以配置颜色和线条宽度
后面两个参数是坐标x,y,不过是相对于你要作画的控件的坐标
最后两个参数是矩形的高和宽

以下是我写的一个winform控件.验证码的.你看看就知道了.其实字符串变图片就是这样的 public partial class codecontrol : usercontrol { private string _code = ""; public string code { get { return this._code; } } public codecontrol() { initializecomponent(); } public void createcodeimage() { string[] str = new string[4]; string servercode = ""; //生成随机生成器 random random = new random(); _code = ""; for (int i = 0; i < 4; i++) { str[i] = random.next(10).tostring().substring(0, 1); _code += str[i]; } createcodeimage(str); } private void createcodeimage(string[] checkcode) { if (checkcode == null || checkcode.length <= 0) return; //system.drawing.bitmap image = new system.drawing.bitmap((int)math.ceiling((checkcode.length * 32.5)), this.codepicturebox.height); system.drawing.bitmap image = new system.drawing.bitmap(this.codepicturebox.width, this.codepicturebox.height); system.drawing.graphics g = graphics.fromimage(image); try { random random = new random(); //清空图片背景色 g.clear(color.white); //画图片的背景噪音线 for (int i = 0; i < 20; i++) { int x1 = random.next(image.width); int x2 = random.next(image.width); int y1 = random.next(image.height); int y2 = random.next(image.height); g.drawline(new pen(color.silver), x1, y1, x2, y2); } //定义颜色 color[] c = { color.black, color.red, color.darkblue, color.green, color.orange, color.brown, color.darkcyan, color.purple }; //定义字体 string[] f = { "verdana", "microsoft sans serif", "comic sans ms", "arial", "宋体" }; for (int k = 0; k <= checkcode.length - 1; k++) { int cindex = random.next(7); int findex = random.next(5); font drawfont = new font(f[findex], 16, (system.drawing.fontstyle.bold)); solidbrush drawbrush = new solidbrush(c[cindex]); float x = 3.0f; float y = 0.0f; float width = 20.0f; float height = 25.0f; int sjx = random.next(10); int sjy = random.next(image.height - (int)height); rectanglef drawrect = new rectanglef(x + sjx + (k * 14), y + sjy, width, height); stringformat drawformat = new stringformat(); drawformat.alignment = stringalignment.center; g.drawstring(checkcode[k], drawfont, drawbrush, drawrect, drawformat); } //画图片的前景噪音点 for (int i = 0; i < 100; i++) { int x = random.next(image.width); int y = random.next(image.height); image.setpixel(x, y, color.fromargb(random.next())); } //画图片的边框线 g.drawrectangle(new pen(color.silver), 0, 0, image.width - 1, image.height - 1); system.io.memorystream ms = new system.io.memorystream(); image.save(ms, system.drawing.imaging.imageformat.gif); this.codepicturebox.image = image.fromstream(ms); } finally { g.dispose(); image.dispose(); } } }

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