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    <p>Ok, the Bounty is gone, but I want to contribute another answer. You will find a working project at github: <a href="https://github.com/vikingosegundo/PlectrumView" rel="nofollow noreferrer">https://github.com/vikingosegundo/PlectrumView</a></p> <pre><code>#import "PlectrumView.h" @implementation PlectrumView - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { } return self; } -(void) drawPlectrumWithPercentage:(CGFloat) percentage color:(UIColor *)color { CGFloat factor = self.frame.size.width ; percentage*=factor; UIBezierPath* plectrum = [UIBezierPath bezierPathWithRoundedRect: CGRectMake(0, factor - percentage, percentage,percentage) byRoundingCorners: UIRectCornerTopLeft | UIRectCornerTopRight | UIRectCornerBottomRight cornerRadii: CGSizeMake(percentage/2, percentage/2)]; [color setFill]; [plectrum fill]; } - (void)drawRect:(CGRect)rect { [self drawPlectrumWithPercentage:1.0 color:[UIColor colorWithWhite:.9 alpha:1]]; [self drawPlectrumWithPercentage:.75 color:[UIColor colorWithRed:245.0/255.0 green:134.0/255.0 blue:122.0/255.0 alpha:1]]; [self drawPlectrumWithPercentage:.61 color:[UIColor colorWithRed:171.0/255.0 green:212.0/255.0 blue:105.0/255.0 alpha:1]]; } @end </code></pre> <p>Results in</p> <p><img src="https://i.stack.imgur.com/UZzgl.png" alt="enter image description here"></p> <hr> <p>edit:</p> <p>I change the plectrum code in a way that it's area will represent the percentage instead of it's width. It feels more natural.</p> <p><img src="https://i.stack.imgur.com/7tobb.png" alt="plectrum new"></p> <pre><code>-(void) drawPlectrumWithPercentage:(CGFloat) percentage color:(UIColor *)color { static CGFloat pi = 3.141592653589793; static CGFloat radius100percent = 50.0; static CGFloat area100percent; static CGFloat threeFouthPiPlusOne; area100percent= radius100percent * radius100percent * pi *3/4 + radius100percent*radius100percent; threeFouthPiPlusOne = (1 + (pi*(3.0/4.0))); CGFloat area = area100percent * percentage; CGFloat newRadius = sqrt(area / threeFouthPiPlusOne); percentage = newRadius/ 50.0; CGFloat factor = self.frame.size.width ; percentage*=factor; UIBezierPath* plectrum = [UIBezierPath bezierPathWithRoundedRect: CGRectMake(0, factor - percentage, percentage,percentage) byRoundingCorners: UIRectCornerTopLeft | UIRectCornerTopRight | UIRectCornerBottomRight cornerRadii: CGSizeMake(percentage/2, percentage/2)]; [color setFill]; [plectrum fill]; } </code></pre>
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    1. COnote that I changed the code.
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    2. COCan you please help me in drawing the next graph too? In that i have to show the arrows too.
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    3. COAs i understand, the solutions and projects shown and linked in this thread, cover all the example you've shown. So I am not sure, how I can help u.
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