Uiview iOS:UIVew&；CALayer-二维与三维变换
在我以前的代码中，我更改了视图drawRect中的坐标系，因此矩形的中心为0,0，顶部为0,1，右侧为1,0。即标准化笛卡尔系统Uiview iOS:UIVew&；CALayer-二维与三维变换,uiview,3d,2d,transform,calayer,Uiview,3d,2d,Transform,Calayer,在我以前的代码中，我更改了视图drawRect中的坐标系，因此矩形的中心为0,0，顶部为0,1，右侧为1,0。即标准化笛卡尔系统 { // SCALE so that we range from TL(0, 0) - BR(2, -2) CGContextScaleCTM (X, 0.5 * bitmapSize.width, -0.5 * bitmapSize.height); // TRANSLATE so that we range from TL(-1,
{
// SCALE so that we range from TL(0, 0) - BR(2, -2)
CGContextScaleCTM (X, 0.5 * bitmapSize.width, -0.5 * bitmapSize.height);
// TRANSLATE so that we range from TL(-1, 1) - BR(1, -1)
// ie: a cartesian coordinate system, centred on (0, 0) with:
// x increasing to the right
// y increasing upwards
// x&y each ranging from -1 to 1
CGContextTranslateCTM(X, 1, -1);
T = CGContextGetCTM (X);
}