Question

What I need to do to draw some shapes on retina display, defining actual screen pixels. I mean that I need that all lines will be 1 pixel width, and no antialiasing. And, if i write the the code:

CGContextMoveToPoint(context,0,0);
CGContextAddLineToPoint(context,0,959);

然后,显示器将从顶端左上层到最左侧最底层的六分之一,包括它。

If I understood well, I need to use CGContextScaleCTM. But there is not always the same regularity in coordinates. Sometimes there is offset on Y-axis, and sometimes no. I have tried to write some macro for converting the coordinates, but have confused at all. I know, that there is logical points and auto positioning stuff. But that is the point that I need to draw all the pixels manually, cause I m developing some util.

Answer 1

相反:

CGContextMoveToPoint(context, 0.5, 0);
CGContextAddLineToPoint(context, 0.5, 959);

<>光> 1 1.0 个Pixel宽线将放在你给它的坐标上。因此,如果你开始(0,0),其中一半将列入1-1至0栏,一半的线将列入0至1栏。愤怒坐标使你能够看到像黑板图像这样的东西。

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