2012-06-11 47 views
2

所以我的問題很簡單。我試圖將我的圖表從條形圖切換到折線圖,但我的折線圖不顯示/繪圖。我爲我的CPTBarPlot'條形圖'使用類似的代碼,並且這種繪製/顯示正確。核心情節CPTScatterPlot'線圖'沒有顯示

其正確繪製我的柱狀圖中的代碼是:

CPTBarPlot *barPlot    = nil;  
barPlot       = [CPTBarPlot tubularBarPlotWithColor:[CPTColor colorWithComponentRed:0.9294f green:0.3960f blue:0.5921f alpha:1.0f] horizontalBars:NO]; 
barPlot.fill     = [CPTFill fillWithColor:[CPTColor colorWithComponentRed:0.9294f green:0.3960f blue:0.5921f alpha:1.0f]]; 
barPlot.opacity     = 0.8f; 
barPlot.dataSource    = self; 
barPlot.delegate    = self; 
barPlot.baseValue    = CPTDecimalFromString(@"0"); 
barPlot.barOffset    = CPTDecimalFromFloat(0.50f); 

switch (graphType) { 
    case kWeightThreeMonth: 
    { 
     barPlot.identifier = [GraphsViewController threeMonthBarPlotIdentifier]; 
    } 
     break; 

    case kWeightSixMonth: 
    { 
     barPlot.identifier = [GraphsViewController sixMonthBarPlotIdentifier]; 
    } 
     break; 

    case kWeightNineMonth: 
    { 
     barPlot.identifier = [GraphsViewController nineMonthBarPlotIdentifier]; 
    } 
     break; 
    default: 
     break; 
} 
barPlot.barCornerRadius   = 2.0f; 
barPlot.lineStyle    = nil; 
[lineGraph addPlot:barPlot toPlotSpace:plotSpace]; 

我的折線圖碼不顯示的是:

// Create a blue plot area 
CPTScatterPlot *boundLinePlot = [[[CPTScatterPlot alloc] init] autorelease]; 
CPTMutableLineStyle *lineStyle = [CPTMutableLineStyle lineStyle]; 
lineStyle.miterLimit   = 1.0f; 
lineStyle.lineWidth    = 3.0f; 
lineStyle.lineColor    = [CPTColor redColor]; 
boundLinePlot.dataLineStyle  = lineStyle; 
switch (graphType) { 
    case kWeightThreeMonth: 
    { 
     boundLinePlot.identifier = [GraphsViewController threeMonthBarPlotIdentifier]; 
    } 
     break; 

    case kWeightSixMonth: 
    { 
     boundLinePlot.identifier = [GraphsViewController sixMonthBarPlotIdentifier]; 
    } 
     break; 

    case kWeightNineMonth: 
    { 
     boundLinePlot.identifier = [GraphsViewController nineMonthBarPlotIdentifier]; 
    } 
     break; 
    default: 
     break; 
} 

boundLinePlot.dataSource = self; 
boundLinePlot.delegate  = self; 
[lineGraph addPlot:boundLinePlot toPlotSpace:plotSpace]; 

// Do a blue gradient 
CPTColor *areaColor1  = [CPTColor colorWithComponentRed:0.3 green:0.3 blue:1.0 alpha:0.8]; 
CPTGradient *areaGradient1 = [CPTGradient gradientWithBeginningColor:areaColor1 endingColor:[CPTColor clearColor]]; 
areaGradient1.angle   = -90.0f; 
CPTFill *areaGradientFill = [CPTFill fillWithGradient:areaGradient1]; 
boundLinePlot.areaFill  = areaGradientFill; 
boundLinePlot.areaBaseValue = [[NSDecimalNumber zero] decimalValue]; 

// Add plot symbols 
CPTMutableLineStyle *symbolLineStyle = [CPTMutableLineStyle lineStyle]; 
symbolLineStyle.lineColor = [CPTColor blackColor]; 
CPTPlotSymbol *plotSymbol = [CPTPlotSymbol ellipsePlotSymbol]; 
plotSymbol.fill    = [CPTFill fillWithColor:[CPTColor blueColor]]; 
plotSymbol.lineStyle  = symbolLineStyle; 
plotSymbol.size    = CGSizeMake(10.0, 10.0); 
boundLinePlot.plotSymbol = plotSymbol; 

我失去了一些東西在這裏?考慮到條形圖工作正常,我會認爲數據源等都會以相同的方式工作。我只是試圖從條形圖切換到折線圖。

任何幫助將不勝感激。

親切的問候, 丹

回答

1

這實際上是我自己的錯。

在dataSource方法中;

-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot 
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index 

我在做一個If語句的;

if ([plot isKindOfClass:[CPTBarPlot class]]){ 

Ofcourse我正在使用CPTScatterPlot,所以我的代碼沒有被調用。衛生署。

1

您可能需要重新加載你的情節的數據。嘗試這樣做:

[lineGraph reloadData] 
+0

嗨skyram。不幸的是,我已經在我的代碼底部做了這些工作(未在我的原始文章中展示過)。奇怪的是,我希望條形圖和折線圖以類似的方式工作。不知道爲什麼條形圖能夠正確地繪製和顯示,而折線圖卻沒有。兩者之間的差異基本上是我原來的帖子中的代碼。謝謝 –