如何在Silverlight中从matrix3d获得2d点? [英] How can I get a 2d point from a matrix3d in silverlight?

问题描述

我有一个Matrix3D对象，该对象定义了具有透视图的2d平面. (想想一幅大画掉在地上，离你很远)

I have a Matrix3D object that defines a 2d plane with perspective. (think a large painting that has fallen on the floor, away from you)

翻译后如何获得与新位置相关的2d点?

How can I get the 2d point that relates to the new location after the translation ?

如果绘画"是三个水平条纹，那么一旦变换绘画"，这三个等宽的条纹现在就是梯形，顶部的条纹小于中间和底部的条纹.

If the 'painting' was three horizontal stripes then once the 'painting' is transformed those three stripes of equal width are now a trapezoid where the top stripe is smaller than the middle and bottom one.

推荐答案

您需要使用此矩阵转换(X，Y，0)形式的3D向量.不幸的是，Matrix3D没有合适的方法，因此您必须手动编写矩阵向量乘法.无论如何，当您进行变换时，新的X，Y坐标将对应于屏幕空间中变换后的位置，而Z坐标将成为深度.

You need to transform a 3D vector of the form (X, Y, 0) using this matrix. Unfortunately, Matrix3D doesn't have an appropriate method, so you'll have to write the matrix-vector multiplication by hand. Anyway, when you do the transform, the new X, Y coordinates will correspond to the transformed position in screen space, and the Z coordinate will be the depth.

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