WriteableBitmapEx.DrawRectangle厚度？
WriteableBitmapEx.DrawRectangle厚度？
提问于 2013-01-27 10:52:14
如何更改使用WriteableBitmapEx.DrawRectangle扩展方法绘制的矩形轮廓的厚度/权重？我用来绘制矩形的代码是：
WriteableBitmap wbmp = new WriteableBitmap(bmp);
wbmp.DrawRectangle(0, 0, 480, 360, Colors.DarkGray);使用此代码，以1px绘制的矩形的厚度。
回答 3
Stack Overflow用户
回答已采纳
发布于 2013-01-27 16:51:20
从WritableBitmapEx.Add Thickness param for shapes解决方法
//Original points for line
int x1 = (int)pts[0].X;
int y1 = (int)pts[0].Y;
int x2 = (int)pts[1].X;
int y2 = (int)pts[1].Y;
//Parallel line code from http://stackoverflow.com/questions/2825412/draw-a-parallel-line var L = Math.Sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
var offsetPixels = 4;//Line "thickness"
// This is the second line will be parallel to the first
int x1p = (int)(x1 + offsetPixels * (y2 - y1) / L);
int x2p = (int)(x2 + offsetPixels * (y2 - y1) / L);
int y1p = (int)(y1 + offsetPixels * (x1 - x2) / L);
int y2p = (int)(y2 + offsetPixels * (x1 - x2) / L);
//writeableBmp.DrawLine(x1, y1, x2, y2, Colors.Red);
//writeableBmp.DrawLine(x1p, y1p, x2p, y2p, Colors.Blue);
//Create closed filled polygon for "thick line"
writeableBmp.FillPolygon(new int[] { x1, y1, x2, y2, x2p, y2p, x1p, y1p, x1, y1 }, Colors.Red);Stack Overflow用户
发布于 2014-01-27 12:30:49
这里有一个很好的变通方法，使用来自‘Rectangle’的不太为人所知的'inflate‘方法：
int pen_thickness = 5;
Rectangle original_rect = new Rect(0, 0, 480, 360); // using the poster's original values
for(int i = 0; i < pen_thickness; i++)
{
Rectangle bigger_rect = Rectangle.Inflate(original_rect, i, i);
wbmp.DrawRectangle(Pens.DarkGray, bigger_rect);
}这将创建一个从最初查找的矩形展开的矩形。也可以进行快速修改，使厚度向内扩展一半(充气时为负值)，向外扩展一半(充气时为正值)。
Stack Overflow用户
发布于 2017-02-13 12:24:38
创建了以下...适用于WriteableBitmapEx
private static void DrawRectangle(WriteableBitmap bitmap,
int left, int top, int width, int height, Color color, int thinkness)
{
var x1 = left;
var y1 = top;
var x2 = left + width;
var y2 = top + height;
bitmap.DrawRectangle(x1, y1, x2, y2, color);
for (var i = 0; i < thinkness; i++)
{
bitmap.DrawRectangle(x1--, y1--, x2++, y2++, color);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/14543961
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