iphonequartz在两条线的上面画两条线会产生蠕虫效应
我正在使用Quartz-2D for iPhone在地图上显示路线。这条路线是根据温度而上色的。因为有些街道是黄色的,所以我在路线线下使用了一条稍粗的黑色线来创建边界效果,这样路线的黄色部分就可以在黄色的街道上看到。但是,即使黑线和路线一样粗,整个路线看起来就像一条蠕虫(非常难看)。我认为这是因为我在各个航路点之间画线,而不是使用最后一个航路点作为下一个起始航路点。这样,如果缺少几个航路点,路线仍将没有切入点 要显示这两行而不产生蠕虫效果,我需要做什么iphonequartz在两条线的上面画两条线会产生蠕虫效应,iphone,drawing,line,quartz-2d,routes,Iphone,Drawing,Line,Quartz 2d,Routes,我正在使用Quartz-2D for iPhone在地图上显示路线。这条路线是根据温度而上色的。因为有些街道是黄色的,所以我在路线线下使用了一条稍粗的黑色线来创建边界效果,这样路线的黄色部分就可以在黄色的街道上看到。但是,即使黑线和路线一样粗,整个路线看起来就像一条蠕虫(非常难看)。我认为这是因为我在各个航路点之间画线,而不是使用最后一个航路点作为下一个起始航路点。这样,如果缺少几个航路点,路线仍将没有切入点 要显示这两行而不产生蠕虫效果,我需要做什么 -(void) drawRect:(CGR
-(void) drawRect:(CGRect) rect
{
CSRouteAnnotation* routeAnnotation = (CSRouteAnnotation*)self.routeView.annotation;
// only draw our lines if we're not int he moddie of a transition and we
// acutally have some points to draw.
if(!self.hidden && nil != routeAnnotation.points && routeAnnotation.points.count > 0)
{
CGContextRef context = UIGraphicsGetCurrentContext();
Waypoint* fromWaypoint = [[Waypoint alloc] initWithDictionary:[routeAnnotation.points objectAtIndex:0]];
Waypoint* toWaypoint;
for(int idx = 1; idx < routeAnnotation.points.count; idx++)
{
toWaypoint = [[Waypoint alloc] initWithDictionary:[routeAnnotation.points objectAtIndex:idx]];
CLLocation* fromLocation = [fromWaypoint getLocation];
CGPoint fromPoint = [self.routeView.mapView convertCoordinate:fromLocation.coordinate toPointToView:self];
CLLocation* toLocation = [toWaypoint getLocation];
CGPoint toPoint = [self.routeView.mapView convertCoordinate:toLocation.coordinate toPointToView:self];
routeAnnotation.lineColor = [fromWaypoint.weather getTemperatureColor];
CGContextBeginPath(context);
CGContextSetLineWidth(context, 3.0);
CGContextSetStrokeColorWithColor(context, [UIColor blackColor].CGColor);
CGContextMoveToPoint(context, fromPoint.x, fromPoint.y);
CGContextAddLineToPoint(context, toPoint.x, toPoint.y);
CGContextStrokePath(context);
CGContextClosePath(context);
CGContextBeginPath(context);
CGContextSetLineWidth(context, 3.0);
CGContextSetStrokeColorWithColor(context, routeAnnotation.lineColor.CGColor);
CGContextMoveToPoint(context, fromPoint.x, fromPoint.y);
CGContextAddLineToPoint(context, toPoint.x, toPoint.y);
CGContextStrokePath(context);
CGContextClosePath(context);
fromWaypoint = toWaypoint;
}
[fromWaypoint release];
[toWaypoint release];
}
}
-(void)drawRect:(CGRect)rect
{
CSRouteAnotation*RouteAnotation=(CSRouteAnotation*)self.routeView.annotation;
//只有在我们不处于过渡模式的情况下才能画出我们的线
//阿库塔利有几点要画。
如果(!self.hidden&&nil!=routeAnotation.points&&routeAnotation.points.count>0)
{
CGContextRef context=UIGraphicsGetCurrentContext();
航路点*fromWaypoint=[[Waypoint alloc]initWithDictionary:[RouteAnotation.points objectAtIndex:0]];
航路点*拖航点;
对于(int idx=1;idx
还有,我有一个
<Error>: CGContextClosePath: no current point.
:CGContextClosePath:没有当前点。
错误,我认为这是胡说八道
请提示我!:)
听起来可能与线帽有关。试着用平头帽画画,看看有什么帮助 更新: 我知道现在发生了什么。它只是一条“背景”线,与前一条“背景”+“放弃”线所覆盖的像素重叠。更改为绘制所有“背景”线,然后绘制所有“前景”线可以避免此问题。 你的线条仍然会透支一些像素,但只有相同的颜色,所以你不会注意到。
(请注意,大多数线条端点封口样式都延伸到线条中实际点的周围,使效果更加明显-重叠像素更多。)您可以只绘制一条线条并使用它,而不是绘制两条线条吗?谢谢大家!因此,简单地添加阴影或线帽没有帮助,效果保持不变。然而,我只是玩了一下代码,结果是,如果我在完整路径中分别画两条线(在两个for循环中),效果就消失了!然后我在背景线上加上了方形线帽,使它稍微好看一点 现在我唯一想知道的是…这有什么解释?这是新代码,我以后会优化它
-(void) drawRect:(CGRect) rect {
CSRouteAnnotation* routeAnnotation = (CSRouteAnnotation*)self.routeView.annotation;
// only draw our lines if we're not int he moddie of a transition and we
// acutally have some points to draw.
if(!self.hidden && nil != routeAnnotation.points && routeAnnotation.points.count > 0)
{
CGContextRef context = UIGraphicsGetCurrentContext();
Waypoint* fromWaypoint = [[Waypoint alloc] initWithDictionary:[routeAnnotation.points objectAtIndex:0]];
Waypoint* toWaypoint;
for(int idx = 1; idx < routeAnnotation.points.count; idx++)
{
toWaypoint = [[Waypoint alloc] initWithDictionary:[routeAnnotation.points objectAtIndex:idx]];
CLLocation* fromLocation = [fromWaypoint getLocation];
CGPoint fromPoint = [self.routeView.mapView convertCoordinate:fromLocation.coordinate toPointToView:self];
CLLocation* toLocation = [toWaypoint getLocation];
CGPoint toPoint = [self.routeView.mapView convertCoordinate:toLocation.coordinate toPointToView:self];
routeAnnotation.lineColor = [fromWaypoint.weather getTemperatureColor];
CGContextBeginPath(context);
CGContextSetLineWidth(context, 3.5);
CGContextSetStrokeColorWithColor(context, [UIColor blackColor].CGColor);
CGContextSetLineCap(context, kCGLineCapSquare);
CGContextMoveToPoint(context, fromPoint.x, fromPoint.y);
CGContextAddLineToPoint(context, toPoint.x, toPoint.y);
CGContextStrokePath(context);
CGContextClosePath(context);
fromWaypoint = toWaypoint;
}
// zweite for schleife
for(int idx = 1; idx < routeAnnotation.points.count; idx++)
{
toWaypoint = [[Waypoint alloc] initWithDictionary:[routeAnnotation.points objectAtIndex:idx]];
CLLocation* fromLocation = [fromWaypoint getLocation];
CGPoint fromPoint = [self.routeView.mapView convertCoordinate:fromLocation.coordinate toPointToView:self];
CLLocation* toLocation = [toWaypoint getLocation];
CGPoint toPoint = [self.routeView.mapView convertCoordinate:toLocation.coordinate toPointToView:self];
routeAnnotation.lineColor = [fromWaypoint.weather getTemperatureColor];
CGContextBeginPath(context);
CGContextSetLineWidth(context, 3.0);
CGContextSetStrokeColorWithColor(context, routeAnnotation.lineColor.CGColor);
CGContextSetLineCap(context, kCGLineCapSquare );
CGContextMoveToPoint(context, fromPoint.x, fromPoint.y);
CGContextAddLineToPoint(context, toPoint.x, toPoint.y);
CGContextStrokePath(context);
CGContextClosePath(context);
}
[fromWaypoint release];
}
}
-(void)drawRect:(CGRect)rect{
CSRouteAnotation*RouteAnotation=(CSRouteAnotation*)self.routeView.annotation;
//只有在我们不处于过渡模式的情况下才能画出我们的线
//阿库塔利有几点要画。
如果(!self.hidden&&nil!=routeAnotation.points&&routeAnotation.points.count>0)
{
CGContextRef context=UIGraphicsGetCurrentContext();
航路点*fromWaypoint=[[Waypoint alloc]initWithDictionary:[RouteAnotation.points objectAtIndex:0]];
航路点*拖航点;
对于(int idx=1;idx