我正在尝试创建饼图。每个馅饼应该有不同的颜色,并有边框。所以我做了我自己的课PieChart.m:CGContextSetRGBStrokeColor不会绘制边框
#import "PieChart.h"
@implementation PieChart
@synthesize startDeg, endDeg, isSelected, colorNumber;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
int centerX = 120;
int centerY = 160;
int radius = 94;
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(ctx, 255.0/255.0, 255.0/255.0, 255.0/255.0, 1.0);
CGContextSetLineWidth(ctx, 2.0);
CGContextSetRGBFillColor(ctx, [self getColorFor:1]/255.0, [self getColorFor:2]/255.0, [self getColorFor:3]/255.0, 1.0);
CGContextMoveToPoint(ctx, centerX, centerY);
CGContextAddArc(ctx, centerX, centerY, radius, (startDeg)*M_PI/180.0, (endDeg)*M_PI/180.0, 0);
CGContextClosePath(ctx);
CGContextFillPath(ctx);
}
- (void)dealloc
{
[super dealloc];
}
-(float)getColorFor:(int)rgb {
if (colorNumber == 1) {
switch (rgb) {
case 1:
return 232.0;
break;
case 2:
return 96.0;
break;
case 3:
return 104.0;
break;
default:
return 255.0;
break;
}
}
if (colorNumber == 2) {
switch (rgb) {
case 1:
return 248.0;
break;
case 2:
return 198.0;
break;
case 3:
return 6.0;
break;
default:
return 255.0;
break;
}
}
return 255.0;
}
@end
问题是,边界永远不会画。或者,如果我设法绘制边界,填充不会在那里!任何建议如何实现?
这是我如何使用这个类在我的ViewController:
- (void)viewDidLoad
{
[super viewDidLoad];
PieChart *pie1 = [[PieChart alloc] initWithFrame:CGRectMake(10, 10, 300, 400)];
pie1.startDeg = 0;
pie1.endDeg = 127;
pie1.colorNumber = 1;
pie1.backgroundColor = [UIColor clearColor];
PieChart *pie2 = [[PieChart alloc] initWithFrame:CGRectMake(10, 10, 300, 400)];
pie2.startDeg = 127;
pie2.endDeg = 360;
pie2.colorNumber = 2;
pie2.backgroundColor = [UIColor clearColor];
[self.view addSubview:pie1];
[self.view addSubview:pie2];
}
感谢的人解决这个问题!这就像一个魅力;) – dizza213