how to draw an arc with line using UIBezierPath - ios

Question

I am trying to draw shape shown in figure. Background is white.. Hope it is visible to you..
I am using bezier path to draw this. I have provided bounds to shape as shown by blue border.
So far I am successfully able to draw just two lines(shown in green). I have to draw the one with red further.
I am unable to draw arc from this point. I can't understand how to pass correct parameters to addArcWithCenter.
Code
-(void) drawRect:(CGRect)rect
{
//declare and instantiate the UIBezierPath object
aPath = [UIBezierPath bezierPath];
// Set the starting point of the shape.
[aPath moveToPoint:CGPointMake(CGRectGetMinX(rect), CGRectGetMinY(rect))];
// Draw some lines.
[aPath addLineToPoint:CGPointMake(CGRectGetMaxX(rect), CGRectGetMinY(rect))];
[aPath addLineToPoint:CGPointMake(CGRectGetMaxX(rect), CGRectGetMaxY(rect) - 40)];
[aPath addArcWithCenter:self.center radius:40 startAngle:3 *(M_PI / 2) endAngle:M_PI clockwise:NO];
//set the line width
aPath.lineWidth = 2;
//set the stoke color
[[UIColor greenColor] setStroke];
//draw the path
[aPath stroke];
}
I am new to core graphics. Please be lenient over me.. Thanks..

Answer 1

Try with this (as you can see, I've used addQuadCurveToPoint a variant of addCurveToPoint proposed by #wain - ask google for addCurveToPoint and switch to picture search to see how it work ) :
-(void) drawRect:(CGRect)rect
{
UIBezierPath * aPath = [UIBezierPath bezierPath];
// Set the starting point of the shape.
[aPath moveToPoint:CGPointMake(CGRectGetMinX(rect), CGRectGetMinY(rect))];
// Draw some lines.
[aPath addLineToPoint:CGPointMake(CGRectGetMaxX(rect), CGRectGetMinY(rect))];
//changes start here !
//the point look to be at 80% down
[aPath addLineToPoint:CGPointMake(CGRectGetMaxX(rect), CGRectGetMaxY(rect) * .8)];
//1st arc
//The end point look to be at 1/4 at left, bottom
CGPoint p = CGPointMake(CGRectGetMaxX(rect) / 4, CGRectGetMaxY(rect));
CGPoint cp = CGPointMake( (CGRectGetMaxX(rect) / 4) + ((CGRectGetMaxX(rect) - (CGRectGetMaxX(rect) / 4)) / 2) , CGRectGetMaxY(rect) * .8);
[aPath addQuadCurveToPoint:p controlPoint:cp];
//2nd arc
//The end point look to be at 80% downt at left,
CGPoint p2 = CGPointMake(CGRectGetMinX(rect), CGRectGetMaxY(rect) * .8);
CGPoint cp2 = CGPointMake( (CGRectGetMaxX(rect) / 4) / 2 , CGRectGetMaxY(rect) * .8);
[aPath addQuadCurveToPoint:p2 controlPoint:cp2];
//close the path
[aPath closePath];
//set the line width
aPath.lineWidth = 2;
//set the stoke color
[[UIColor greenColor] setStroke];
//draw the path
[aPath stroke];
}