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我正在用这个tutorial跟着Quartz做一个图形。使用Quartz绘制图形的流畅线条
这是我硬编码类:
#import "GraphView.h"
#define kGraphHeight 110
#define kDefaultGraphWidth 900
#define kOffsetX 0
#define kStepX 50
#define kStepY 50
#define kOffsetY 10
#define kGraphBottom 110
#define kGraphTop 0
#define kBarTop 10
#define kBarWidth 40
#define kCircleRadius 3
@implementation GraphView
float data[] = {0.7, 0.4, 0.9, 1.0, 0.2, 0.85, 0.11, 0.75, 0.53, 0.44, 0.88, 0.77, 0.99, 0.55};
- (void)drawLineGraphWithContext:(CGContextRef)ctx
{
CGContextSetLineWidth(ctx, 0.2);
CGContextSetStrokeColorWithColor(ctx, [[UIColor colorWithRed:1.0 green:0.5 blue:0 alpha:1.0] CGColor]);
int maxGraphHeight = kGraphHeight - kOffsetY;
CGContextBeginPath(ctx);
CGContextMoveToPoint(ctx, kOffsetX, kGraphHeight - maxGraphHeight * data[0]);
for (int i = 1; i < sizeof(data); i++)
{
CGContextAddLineToPoint(ctx, kOffsetX + i * kStepX, kGraphHeight - maxGraphHeight * data[i]);
}
CGContextDrawPath(ctx, kCGPathStroke);
CGContextSetFillColorWithColor(ctx, [[UIColor colorWithRed:1.0 green:0.5 blue:0 alpha:1.0] CGColor]);
}
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetAllowsAntialiasing(context, true);
for (int i = 0; i < sizeof(data); i++)
{
[self drawLineGraphWithContext:context];
}
}
@end
这是结果:
正如你所看到的,线不能有任何欠光滑。他们看起来不太好。尝试抗锯齿但没有任何改变,我如何提高线条质量?
谢谢!
你是对的,我是如此f @ @#惭愧。我正在绘制和重绘,这就是为什么它看起来很糟糕。从drawRect中移除for循环做到了。 – ferostar 2012-04-02 22:41:15