C# 如何在特定边界内绘制具有可变宽度边框的圆角矩形
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How to draw rounded rectangle with variable width border inside of specific bounds
提问by Dylan Vester
I have a method that draws a rounded rectangle with a border. The border can be any width, so the problem I'm having is the border is extending past the given bounds when it's thick because it's drawn from the center of a path.
我有一个方法可以绘制一个带边框的圆角矩形。边框可以是任何宽度，所以我遇到的问题是当它很厚时边框会延伸超过给定的边界，因为它是从路径的中心绘制的。
How would I include the width of the border so that it fits perfectly in the given bounds?
我将如何包含边框的宽度以使其完全适合给定的边界？
Here's the code I'm using to draw the rounded rectangle.
这是我用来绘制圆角矩形的代码。
private void DrawRoundedRectangle(Graphics gfx, Rectangle Bounds, int CornerRadius, Pen DrawPen, Color FillColor)
{
GraphicsPath gfxPath = new GraphicsPath();
DrawPen.EndCap = DrawPen.StartCap = LineCap.Round;
gfxPath.AddArc(Bounds.X, Bounds.Y, CornerRadius, CornerRadius, 180, 90);
gfxPath.AddArc(Bounds.X + Bounds.Width - CornerRadius, Bounds.Y, CornerRadius, CornerRadius, 270, 90);
gfxPath.AddArc(Bounds.X + Bounds.Width - CornerRadius, Bounds.Y + Bounds.Height - CornerRadius, CornerRadius, CornerRadius, 0, 90);
gfxPath.AddArc(Bounds.X, Bounds.Y + Bounds.Height - CornerRadius, CornerRadius, CornerRadius, 90, 90);
gfxPath.CloseAllFigures();
gfx.FillPath(new SolidBrush(FillColor), gfxPath);
gfx.DrawPath(DrawPen, gfxPath);
}
采纳答案by Dylan Vester
Alright guys, I figured it out! Just need to shrink the bounds to take into account the width of the pen. I kind of knew this was the answer I was just wondering if there was a way to draw a line on the inside of a path. This works good though.
好吧，伙计们，我想通了！只需要缩小边界以考虑笔的宽度。我有点知道这就是答案，我只是想知道是否有办法在路径的内侧画一条线。不过这很好用。
private void DrawRoundedRectangle(Graphics gfx, Rectangle Bounds, int CornerRadius, Pen DrawPen, Color FillColor)
{
int strokeOffset = Convert.ToInt32(Math.Ceiling(DrawPen.Width));
Bounds = Rectangle.Inflate(Bounds, -strokeOffset, -strokeOffset);
DrawPen.EndCap = DrawPen.StartCap = LineCap.Round;
GraphicsPath gfxPath = new GraphicsPath();
gfxPath.AddArc(Bounds.X, Bounds.Y, CornerRadius, CornerRadius, 180, 90);
gfxPath.AddArc(Bounds.X + Bounds.Width - CornerRadius, Bounds.Y, CornerRadius, CornerRadius, 270, 90);
gfxPath.AddArc(Bounds.X + Bounds.Width - CornerRadius, Bounds.Y + Bounds.Height - CornerRadius, CornerRadius, CornerRadius, 0, 90);
gfxPath.AddArc(Bounds.X, Bounds.Y + Bounds.Height - CornerRadius, CornerRadius, CornerRadius, 90, 90);
gfxPath.CloseAllFigures();
gfx.FillPath(new SolidBrush(FillColor), gfxPath);
gfx.DrawPath(DrawPen, gfxPath);
}
