如何在coreplot中触及该点时获取某个点的信息？

Question

我在核心情节的分散情节中工作。当我触摸该图中任何绘制的点时，我需要显示一些与该触摸点相关的信息。

我怎样才能做到这一点？

提前致谢。

Answer 1

这些委托方法帮助了我。

-(BOOL)plotSpace:(CPTXYPlotSpace *)space shouldHandlePointingDeviceUpEvent:(id)event atPoint:(CGPoint)point{
 NSLog(@"point.x=%lf,point.y=%lf",point.x,point.y);
 return YES;
}

-(BOOL)plotSpace:(CPTXYPlotSpace *)space shouldHandlePointingDeviceCancelledEvent:(id)event{
 //NSLog(@"point.x=%lf,point.y=%lf",point.x,point.y);
 return YES;
}

 -(BOOL)plotSpace:(CPTXYPlotSpace *)space shouldHandlePointingDeviceDownEvent:(id)event atPoint:(CGPoint)point{
 NSLog(@"point.x=%lf,point.y=%lf",point.x,point.y);
 return YES;
}

-(BOOL)plotSpace:(CPTXYPlotSpace *)space shouldHandlePointingDeviceDraggedEvent:(id)event atPoint:(CGPoint)point{
 NSLog(@"point.x=%lf,point.y=%lf",point.x,point.y);
 return YES;
}

Answer 2

Core Plot附带的示例应用程序显示了几种不同的方法。在Plot Gallery应用程序中，查看渐变散点图或简单散点图。 Mac版CPTTestApp有一个点选择演示，它显示了在所选点而不是标签上绘制十字准线的一种方法。