How do I draw a point using Core Graphics?

Question

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. How do I do that

Answer 1

Draw a very small ellipse/circle and fill it!

CGContextAddEllipseInRect(Context,(CGRectMake (x_dot, y_dot, 3.0, 3.0));
CGContextDrawPath(Context, kCGPathFill);
CGContextStrokePath(Context);

I am using this code to create a small dot (3x3 pixels) in a dotted music note.