XNA - 用现有纹理填充多边形？ [英] XNA - Fill polygon with existing texture?

问题描述

Hey Codeproject，



如果我的多边形类似于带有铜线的正方形：

0：0,0

1：0,32

2：32,32

3：32,0



如何用现有的Texture2D填充那些cooardinates（方形），并将带纹理的多边形转换为另一个Texture2D？



这就是我的意思：



Texture2D：---

多边形：[]

新的Texture2D：[ - ]

Hey Codeproject,

If I have a polygon that resembles a square with the cooardinates:
0: 0, 0
1: 0, 32
2: 32, 32
3: 32, 0

How would I fill those cooardinates(The square) with an existing Texture2D, and convert the polygon with the texture to another Texture2D?

Here's what I mean:

Texture2D: ---
Polygon: [ ]
New Texture2D: [-]

推荐答案

我已经谷歌搜索了一段时间，我遇到了这个。我将对此进行测试。

I've been Googling for a while, and I came across this. I'll be testing this out.

private Bitmap ClippedBitmap(Bitmap texture, Point[] pointsArray, out Point position)
    {
        int minX = pointsArray.Min(x => x.X);
        int maxX = pointsArray.Max(x => x.X);
        int minY = pointsArray.Min(x => x.Y);
        int maxY = pointsArray.Max(x => x.Y);
        position = new Point(minX, minY);
        Bitmap bit = new Bitmap(maxX - minX, maxY - minY);
        Point[] offset = new Point[pointsArray.Length];
        pointsArray.CopyTo(offset, 0);
        offset = Array.ConvertAll(offset, x=> x = new Point(x.X - minX,x.Y - minY)); 
        Graphics g = Graphics.FromImage(bit);
        TextureBrush tb = new TextureBrush(texture);
        g.FillPolygon(tb, offset);
        return bit;
    }

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