FYI to draw a line
This code constructs a triangle from a set of three lines.
// Draw a purple triangle with using lines
CGContextSetRGBStrokeColor(ctx, 255, 0, 255, 1);
CGPoint points[6] = { CGPointMake(100, 200), CGPointMake(150, 250),
CGPointMake(150, 250), CGPointMake(50, 250),
CGPointMake(50, 250), CGPointMake(100, 200) };
CGContextStrokeLineSegments(ctx, points, 6);
u can set any point to draw graph
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