为不同的点更改CPScatterPlot的线型

Question

我在ios上使用coreplot并且有一个散点图。是否可以根据绘制的点改变线条样式？我只找到了如何为整个情节设置它。

Answer 1

是。通过实施 - CPScatterPlotDelegate，确保您的图表委托符合symbolForScatterPlot:recordIndex:。这是一个工作实现，它返回与_selectedIndex匹配的索引的不同符号：

- (CPPlotSymbol *)symbolForScatterPlot:(CPScatterPlot *)plot recordIndex:(NSUInteger)index
{   
    CPMutableLineStyle *symbolLineStyle = [CPMutableLineStyle lineStyle];
    symbolLineStyle.lineColor = [CPColor blackColor];
    CPPlotSymbol *plotSymbol = [CPPlotSymbol ellipsePlotSymbol];
    plotSymbol.lineStyle = symbolLineStyle;

    if (_selectedIndex != NSNotFound && index == _selectedIndex) 
    {
        plotSymbol.symbolType = CPPlotSymbolTypeDiamond;
        plotSymbol.size = CGSizeMake(12, 12);
        plotSymbol.fill = [CPFill fillWithColor:[CPColor redColor]];
    }
    else
    {
        plotSymbol.symbolType = CPPlotSymbolTypeEllipse 
        plotSymbol.size = CGSizeMake(8, 8);
        plotSymbol.fill = [CPFill fillWithColor:[CPColor greenColor]];  
    }
    return plotSymbol;
}