CPTXYScatterPlot-我可以设置绘图符号的Z顺序吗？ [英] CPTXYScatterPlot - Can I set the Z order of plot symbols?

问题描述

使用Core Plot的CPTScatterPlot，我制作了一个类似于上面的气泡图。

Using Core Plot's CPTScatterPlot, I've made a bubble chart that looks like the above.

我已经实现了 plotSymbolWasSelectedAtRecordIndex 我的代表，这样我就可以检测到用户何时触摸了其中一个气泡。以该屏幕截图为例，我希望能够突出显示黄色气泡，并在用户触摸时将其置于红色气泡之前。用图形方式，我想将所选 CPTPlotSymbol 的Z顺序设置为高于其他顺序。我该怎么做？我可以通过在 symbolForScatterPlot 方法中将其绘制为不同的颜色来突出显示选定的气泡，但是我似乎找不到找到使它在前面绘制的方法

I've implemented plotSymbolWasSelectedAtRecordIndex in my delegate so I can detect when the user touches one of the bubbles. Using this screenshot as an example, I want to be able to highlight the yellow bubble and bring it in front of the red one when the user touches it. In graphical terms, I want to set the Z order of the selected CPTPlotSymbol to be higher than the others. How can I accomplish that? I'm able to highlight the selected bubble by drawing it in a different color in my symbolForScatterPlot method, but I can't seem to find a way to make it draw in front of the overlapping symbol.

推荐答案

Core Plot以数据点在数据源中出现的顺序绘制数据点。您需要对数据进行重新排序，以使最上面的气泡位于最后一个索引处，并在绘图上调用 -reloadData 告诉其刷新数据。如果数组中有数据点，则按所需的z索引（从后到前）对其进行排序，然后使用排序后的数组来填充数据源。

Core Plot draws the data points in the order they appear in the datasource. You'll need to reorder the data so the top-most bubble is at the last index and call -reloadData on the plot to tell it to refresh its data. If you have the data points in an array, sort it by the desired z-index (back to front) and use the sorted array to feed the datasource.

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