Core Graphics Drawing

1.)Drawing a Line Segment
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CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 2.0);
CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
CGContextMoveToPoint(context, 50, 200);
CGContextAddLineToPoint(context,100,100);
CGContextMoveToPoint(context, 50, 200);
CGContextAddLineToPoint(context,200,400);
CGContextStrokePath(context);


2.)Drawing a Filled Circle
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CGContextRef contextRef = UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(contextRef, 255, 0, 255, 0.9);
CGContextSetRGBStrokeColor(contextRef, 255, 0, 0, 0.9);
CGContextFillEllipseInRect(contextRef, CGRectMake(100, 100, 50, 50));


3.)Drawing a Hollow Circle
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CGContextRef contextRef = UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(contextRef, 255, 0, 255, 0.9);
CGContextSetRGBStrokeColor(contextRef, 255, 0, 0, 0.9);
CGContextStrokeEllipseInRect(contextRef, CGRectMake(200, 100, 50, 50));


4.)Drawing a circle with boundary
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CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(context, 0, 255, 0, 1);
CGContextFillEllipseInRect(context, CGRectMake(100, 200, 25, 25));
CGContextSetLineWidth(context, 2.0);
CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
CGContextStrokeEllipseInRect(context,CGRectMake(100, 200, 25, 25));


5.)Drawing a Hollow Rectangle
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CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(ctx, 255, 255, 0, 1);
CGContextStrokeRect(ctx, CGRectMake(195, 195, 60, 60));


6.)Drawing a Solid Rectangle
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CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(ctx, 255, 255, 0, 1);
CGContextFillRect(ctx, CGRectMake(260, 195, 60, 60));


7.)Drawing a Triangle
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CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(ctx, 255, 0, 255, 1);
CGPoint points[6] = { CGPointMake(200, 200), CGPointMake(250, 250),
CGPointMake(250, 250), CGPointMake(100, 250),
CGPointMake(100, 250), CGPointMake(200, 200) };
CGContextStrokeLineSegments(ctx, points, 6);