更改CPScatterPlot不同點的線條樣式

Question

我在ios上使用coreplot並繪製散點圖。是否可以根據繪製的點來改變線條樣式？我只發現如何爲整個情節設置它。

Answer 1

是的。通過執行 - symbolForScatterPlot:recordIndex:確保您的圖表代理符合CPScatterPlotDelegate。這裏有一個返回不同的符號相匹配_selectedIndex索引工作實現：

- (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; 
}