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for example rotate with this line: (0,0,300,300)
See the rotate() function.
The 2d Transformations tutorial is probably also relevant.
i said in 3D mode ..... i mean in 3D mode it only can rotate in X Y Z three direction can the rotate main axis be set by my self??? for examle set (0,0,300,300) as axis
You mean like this?
size(600, 600, P3D);
rotate(angle, 300, 300, 0);
rect(100, 100, 100, 100);
thanks,but what's 300,300,0?point?and that's mean the line across the (0,0,0) and (300,300,0)?
Yes, you are defining an axis between 0,0,0 and 300, 300, 0, and then rotating around that axis.