軸位置和繪圖顏色

Question

我有兩個問題。

1. 我的軸不能滿足於適當的點即我希望我的y軸的0相交的x軸的第一個值。我通過orthogonalCoordinateDecimal屬性嘗試了很多方法，但我無法管理它。其次，我右邊的第二個圖不是紅色的繪圖，因爲我已經編碼了。你能告訴我我可能會錯過什麼嗎？

圖：

的我的代碼片段採寫：

NSTimeInterval oneDay = 24 * 60 * 60; 

// Setup plot spaces 

//1- calorie 
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace; 
plotSpace.allowsUserInteraction = YES; 
NSTimeInterval xLow  = 0.0f; 
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(xLow) length:CPTDecimalFromFloat(oneDay * 7.0f)]; 
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(0) length:CPTDecimalFromInt(600)]; 

//2- exercise 
plotSpace2 = [[[CPTXYPlotSpace alloc] init] autorelease]; 
plotSpace2.allowsUserInteraction = YES; 
plotSpace2.xRange = plotSpace.xRange; 
plotSpace2.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0) 
               length:CPTDecimalFromFloat(60.0)]; 
[graph addPlotSpace:plotSpace2]; 

CPTXYAxisSet *axisSet = (CPTXYAxisSet *) self.graphHost.hostedGraph.axisSet; 

// Axes 
CPTXYAxis *x = axisSet.xAxis; 
NSTimeInterval oneDay = 24 * 60 * 60;  
x.majorIntervalLength   = CPTDecimalFromFloat(oneDay); 
x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0"); 
x.minorTicksPerInterval  = 0; 

CPTXYAxis *y = axisSet.yAxis; 
y.majorIntervalLength = CPTDecimalFromInt(200); 
y.minorTicksPerInterval = 9; 
y.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0); 
y.title = @"Calories Burned"; 

CPTXYAxis *y2 = [[[CPTXYAxis alloc] init]retain]; 
y2.coordinate = CPTCoordinateY; 
y2.majorIntervalLength = CPTDecimalFromString(@"5.0"); 
y2.minorTicksPerInterval = 3; 
y2.orthogonalCoordinateDecimal = CPTDecimalFromString(@"-20.0"); 
y2.title = @"Exercise Time (min)"; 

//I added these lines too 
//adding 2nd axis 
NSMutableArray *newAxes = [graph.axisSet.axes mutableCopy]; 
[newAxes addObject:y2]; 
graph.axisSet.axes = newAxes; 
[newAxes release]; 

CPTScatterPlot *caloriePlot = [[CPTScatterPlot alloc] init]; 
caloriePlot.dataSource = self; 
caloriePlot.identifier = @"Calorie"; 

//create styles and symbols 
CPTMutableLineStyle *calorieLineStyle = [caloriePlot.dataLineStyle mutableCopy]; 
calorieLineStyle.lineWidth = 2.5; 
calorieLineStyle.lineColor = [CPTColor greenColor]; 
caloriePlot.dataLineStyle = calorieLineStyle; 

[graph addPlot:caloriePlot toPlotSpace:plotSpace]; 

CPTScatterPlot *exercisePlot = [[CPTScatterPlot alloc] init]; 
exercisePlot.dataSource = self; 
exercisePlot.identifier = @"Exercise"; 

CPTMutableLineStyle *exerciseLineStyle = [exercisePlot.dataLineStyle mutableCopy]; 
exerciseLineStyle.lineWidth = 2.5; 
exerciseLineStyle.lineColor = [CPTColor redColor]; 
exerciseLineStyle.dashPattern = [NSArray arrayWithObjects:[NSNumber numberWithFloat:5.0f], [NSNumber numberWithFloat:5.0f], nil]; 
exercisePlot.dataLineStyle =calorieLineStyle; 
[graph addPlot:exercisePlot toPlotSpace:plotSpace2]; 

任何幫助將是appreciated.Thanks。

Answer 1

1. 很難說，沒有看到更多的代碼。你有多少個地方空間？每個軸分配哪個繪圖空間？每個繪圖空間的繪圖範圍是什麼？

2. 改變這一行：

   exercisePlot.dataLineStyle = calorieLineStyle; 
   

   到

   exercisePlot.dataLineStyle = exerciseLineStyle;