Core Plot 1.0 Retina图像无法正确显示

Question

我刚刚完成了我的应用程序，并在核心情节和他们敬业的员工的帮助下添加了一些很棒的东西。我的问题涉及使用视网膜显示器的图像。我有一个注释，是一个讲话泡泡的图片。当我在模拟器中运行应用程序时，它显示正常分辨率，但当我切换到视网膜时，图像被裁剪。见下图。我有一个.png，我称之为Bubble，我又添加了另一个名为Bubble @ 2x的大小两倍，我认为这是我需要做的。那没用。所以我试着设置view.contentScale，见下面的代码。但似乎没有任何效果。任何人都有任何想法，我忘了做什么？再次感谢。

{
    //first annotation
    NSValue *value = [self.myData objectAtIndex:index];
    CGPoint point = [value CGPointValue];
    NSString *number1 = [NSString stringWithFormat:@"(%.2f, ", point.x];
    NSString *number2 = [NSString stringWithFormat:@"%.2f)", point.y];
    NSNumber *x = [NSNumber numberWithFloat:point.x];
    NSNumber *y = [NSNumber numberWithFloat:point.y];    
    NSArray *anchorPoint = [NSArray arrayWithObjects: x, y, nil];
    NSString *final = [number1 stringByAppendingString:number2];

    //second annotation        
    UIImage *bubble = [UIImage imageNamed:@"Bubble.png"];
    CPTImage *fillimage = [CPTImage imageWithCGImage:bubble.CGImage];
    CPTBorderedLayer *imageLayer = [[CPTBorderedLayer alloc] init];
    //imageLayer.contentsScale = [[UIScreen mainScreen] scale]; //tried this
    imageLayer.frame = CGRectMake(0, 0, 150, 80);
    //imageLayer.contentsScale = 2.0f;  //and this

    imageLayer.fill = [CPTFill fillWithImage:fillimage];

    CPTTextLayer *textLayer = [[CPTTextLayer alloc] initWithText:final style:annotationTextStyle];
    _annotation = [[CPTPlotSpaceAnnotation alloc] initWithPlotSpace:graph.defaultPlotSpace anchorPlotPoint:anchorPoint];        
    _annotation.contentLayer = textLayer;        
    _annotation.displacement = CGPointMake(90.0f, 5.0f);
    _annotation.rotation = M_PI * .03f;

    _picAnnotation = [[CPTPlotSpaceAnnotation alloc] initWithPlotSpace:graph.defaultPlotSpace anchorPlotPoint:anchorPoint];
    _picAnnotation.contentLayer = imageLayer;
    _picAnnotation.displacement = CGPointMake(75.0f, 5.0f);

}

在该代码之后，我随后放置了两个注释。你可以看到一个有用，另一个没有。

Answer 1

如果您需要支持Retina图像，则应在创建scale时传递图像CPTImage。

CPTImage *fillimage = [CPTImage imageWithCGImage:bubble.CGImage
                                           scale:bubble.scale];