Answer by Empy2 for Explanation of a 45-degree 2D rotation matrix
You were using radians. 45 radians = 8100/pi degrees; 45 degrees = pi/4 radians. Use cos(pi/4) and sin(pi/4), or else change your calculator to degree mode.
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Explanation of a 45-degree 2D rotation matrix
I am trying to understand how 2D matrix transformation works. Let's say I have a point (1, 1). The angle it makes with X axis is $\theta = 45°$ and I want to rotate the point (around origin) by...
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