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//
// UACellBackgroundView.m
// Ambiance
//
// Created by Matt Coneybeare on 1/31/10.
// Copyright 2010 Urban Apps LLC. All rights reserved.
//
 
#define TABLE_CELL_BACKGROUND { 1, 1, 1, 1, 0.866, 0.866, 0.866, 1} // #FFFFFF and #DDDDDD
#define kDefaultMargin 10
 
#import "UACellBackgroundView.h"
 
static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth,float ovalHeight);
 
@implementation UACellBackgroundView
 
@synthesize position;
 
- (BOOL) isOpaque {
return NO;
}
 
-(void)drawRect:(CGRect)aRect {
// Drawing code
 
CGContextRef c = UIGraphicsGetCurrentContext();
 
int lineWidth = 1;
CGRect rect = [self bounds];
CGFloat minx = CGRectGetMinX(rect), midx = CGRectGetMidX(rect), maxx = CGRectGetMaxX(rect);
CGFloat miny = CGRectGetMinY(rect), midy = CGRectGetMidY(rect), maxy = CGRectGetMaxY(rect);
miny -= 1;
CGFloat locations[2] = { 0.0, 1.0 };
CGColorSpaceRef myColorspace = CGColorSpaceCreateDeviceRGB();
CGGradientRef myGradient = nil;
CGFloat components[8] = TABLE_CELL_BACKGROUND;
CGContextSetStrokeColorWithColor(c, [[UIColor grayColor] CGColor]);
CGContextSetLineWidth(c, lineWidth);
CGContextSetAllowsAntialiasing(c, YES);
CGContextSetShouldAntialias(c, YES);
if (position == UACellBackgroundViewPositionTop) {
miny += 1;
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, minx, maxy);
CGPathAddArcToPoint(path, NULL, minx, miny, midx, miny, kDefaultMargin);
CGPathAddArcToPoint(path, NULL, maxx, miny, maxx, maxy, kDefaultMargin);
CGPathAddLineToPoint(path, NULL, maxx, maxy);
CGPathAddLineToPoint(path, NULL, minx, maxy);
CGPathCloseSubpath(path);
// Fill and stroke the path
CGContextSaveGState(c);
CGContextAddPath(c, path);
CGContextClip(c);
myGradient = CGGradientCreateWithColorComponents(myColorspace, components, locations, 2);
CGContextDrawLinearGradient(c, myGradient, CGPointMake(minx,miny), CGPointMake(minx,maxy), 0);
CGContextAddPath(c, path);
CGPathRelease(path);
CGContextStrokePath(c);
CGContextRestoreGState(c);
 
} else if (position == UACellBackgroundViewPositionBottom) {
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, minx, miny);
CGPathAddArcToPoint(path, NULL, minx, maxy, midx, maxy, kDefaultMargin);
CGPathAddArcToPoint(path, NULL, maxx, maxy, maxx, miny, kDefaultMargin);
CGPathAddLineToPoint(path, NULL, maxx, miny);
CGPathAddLineToPoint(path, NULL, minx, miny);
CGPathCloseSubpath(path);
// Fill and stroke the path
CGContextSaveGState(c);
CGContextAddPath(c, path);
CGContextClip(c);
myGradient = CGGradientCreateWithColorComponents(myColorspace, components, locations, 2);
CGContextDrawLinearGradient(c, myGradient, CGPointMake(minx,miny), CGPointMake(minx,maxy), 0);
CGContextAddPath(c, path);
CGPathRelease(path);
CGContextStrokePath(c);
CGContextRestoreGState(c);
 
} else if (position == UACellBackgroundViewPositionMiddle) {
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, minx, miny);
CGPathAddLineToPoint(path, NULL, maxx, miny);
CGPathAddLineToPoint(path, NULL, maxx, maxy);
CGPathAddLineToPoint(path, NULL, minx, maxy);
CGPathAddLineToPoint(path, NULL, minx, miny);
CGPathCloseSubpath(path);
// Fill and stroke the path
CGContextSaveGState(c);
CGContextAddPath(c, path);
CGContextClip(c);
myGradient = CGGradientCreateWithColorComponents(myColorspace, components, locations, 2);
CGContextDrawLinearGradient(c, myGradient, CGPointMake(minx,miny), CGPointMake(minx,maxy), 0);
CGContextAddPath(c, path);
CGPathRelease(path);
CGContextStrokePath(c);
CGContextRestoreGState(c);
} else if (position == UACellBackgroundViewPositionSingle) {
miny += 1;
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, minx, midy);
CGPathAddArcToPoint(path, NULL, minx, miny, midx, miny, kDefaultMargin);
CGPathAddArcToPoint(path, NULL, maxx, miny, maxx, midy, kDefaultMargin);
CGPathAddArcToPoint(path, NULL, maxx, maxy, midx, maxy, kDefaultMargin);
CGPathAddArcToPoint(path, NULL, minx, maxy, minx, midy, kDefaultMargin);
CGPathCloseSubpath(path);
// Fill and stroke the path
CGContextSaveGState(c);
CGContextAddPath(c, path);
CGContextClip(c);
myGradient = CGGradientCreateWithColorComponents(myColorspace, components, locations, 2);
CGContextDrawLinearGradient(c, myGradient, CGPointMake(minx,miny), CGPointMake(minx,maxy), 0);
CGContextAddPath(c, path);
CGPathRelease(path);
CGContextStrokePath(c);
CGContextRestoreGState(c);
}
CGColorSpaceRelease(myColorspace);
CGGradientRelease(myGradient);
return;
}
 
- (void)dealloc {
[super dealloc];
}
 
- (void)setPosition:(UACellBackgroundViewPosition)newPosition {
if (position != newPosition) {
position = newPosition;
[self setNeedsDisplay];
}
}
 
@end
 
static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth,float ovalHeight) {
float fw, fh;
if (ovalWidth == 0 || ovalHeight == 0) {// 1
CGContextAddRect(context, rect);
return;
}
CGContextSaveGState(context);// 2
CGContextTranslateCTM (context, CGRectGetMinX(rect),// 3
CGRectGetMinY(rect));
CGContextScaleCTM (context, ovalWidth, ovalHeight);// 4
fw = CGRectGetWidth (rect) / ovalWidth;// 5
fh = CGRectGetHeight (rect) / ovalHeight;// 6
CGContextMoveToPoint(context, fw, fh/2); // 7
CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);// 8
CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1);// 9
CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1);// 10
CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); // 11
CGContextClosePath(context);// 12
CGContextRestoreGState(context);// 13
}

Updated with my current code (fixed some minor things, leaks)

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