I see APIs in Quartz for drawing lines and circles. But all I want to do is to specify the (x,y) cartesian coordinate to color a pixel a particular value. ...
I two concentric circles on the screen and I want the circle on the inside to move around while the user drags their finger around the outside of the larger circle. ...
I was wondering if anyone would be able to tell me how you would go about this?
e.g.
- User pushes (+) Add Button
- Image appears to let user set start point ...
Core Graphics does not provide an anchor point property, and all transforming/translating assumes an anchor point 0,0 (lower left). Core Animation, does provide an anchor point, but we are not using ...