如何使用coreplot CPPlotSymbol绘制垂直线？ [英] How do you draw vertical line using coreplot CPPlotSymbol?

问题描述

如何使用Custom PlotSymbol在plotSymbol上绘制垂直线？

How do I draw a vertical line on plotSymbol using Custom PlotSymbol? If it would be grateful, give any samples regarding that.

Sri

推荐答案

您只需创建一个描述自定义符号轮廓的CGPath。下面是来自CPTestApp（在CorePlot / examples文件夹中）的示例：

You simply create a CGPath that describes the outline of your custom symbol. Here's a sample from CPTestApp (in the CorePlot/examples folder):

CPPlotSymbol *symbol = [[[CPPlotSymbol alloc] init] autorelease];
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, 0., 0.);

CGPathAddEllipseInRect(path, NULL, CGRectMake(0., 0., 10., 10.));
CGPathAddEllipseInRect(path, NULL, CGRectMake(1.5, 4., 3., 3.));
CGPathAddEllipseInRect(path, NULL, CGRectMake(5.5, 4., 3., 3.));
CGPathMoveToPoint(path, NULL, 5., 2.);
CGPathAddArc(path, NULL, 5., 3.3, 2.8, 0., pi, TRUE);
CGPathCloseSubpath(path);

symbol.customSymbolPath = path;
symbol.usesEvenOddClipRule = YES;
CGPathRelease(path);

您可以设置 plotSymbol 散点图以将您的符号应用到每个点或使用 -symbolForScatterPlot：recordIndex：或 -symbolsForScatterPlot：recordIndexRange：方法来应用它的一些点。

You can set the plotSymbol property on the scatter plot to apply your symbol to every point or use the -symbolForScatterPlot:recordIndex: or -symbolsForScatterPlot:recordIndexRange: datasource method to apply it to some of the points.

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