在核心图中触摸多个plotsymbol并获得两个触摸图符号索引 [英] Touching a multiple plotsymbol in core plot and get the two touch plot symbol index

问题描述

我希望同时触及两点之间的区别。但我只通过这种方法得到散射图的一个索引，

I want to get the difference between two points touched simultaneously. But i am only getting one index into scatter plot by this method,

-(void)scatterPlot:(CPTScatterPlot *)plot plotSymbolWasSelectedAtRecordIndex:(NSUInteger)idx withEvent:(CPTNativeEvent *)event;

如何通过多点触控得到两个索引？

How to get two index by multitouch?

推荐答案

内置交互方法一次只支持一个点。您可以获取触摸点的坐标，将它们转换为绘图区域图层的坐标空间，并使用 -indexOfVisiblePointClosestToPlotAreaPoint：方法从中获取每个点的索引散点图。

The built-in interaction methods only support one point at a time. You can get the coordinates of the touch points, convert them to the coordinate space of the plot area layer, and use the -indexOfVisiblePointClosestToPlotAreaPoint: method to get the index of each point from the scatter plot.

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