विभिन्न अक्ष स्केल के साथ कोर प्लॉट ग्राफ़ में दो वाई अक्ष

Question

मैं एक ऐप प्रोग्रामिंग कर रहा हूं जहां मेरे पास दो वाई अक्ष और एक एक्स अक्ष के साथ ग्राफ है। बाएं वाई धुरी 0 से 20 तक है इसलिए 20 प्रमुख टिक अक्ष हैं। राइट वाई धुरी 0 से 10 तक है, इसलिए मैं बाएं वाई अक्ष को प्रत्येक वैकल्पिक प्रमुख TickAxis के लिए लेबल करना चाहता हूं।

यहाँ मेरी कोड स्निपेट

//code 
    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)self.graph.defaultPlotSpace; 
float xmax=10.0; 
float xmin=0.0; 
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(xmin)  length:CPTDecimalFromFloat(xmax-xmin)]; 
float ymax=20.0; 
float ymin=0.0; 
float ymax2=10.0; 
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(ymin) length:CPTDecimalFromFloat(ymax-ymin)]; 



// Grid line styles 
CPTMutableLineStyle *majorGridLineStyle = [CPTMutableLineStyle lineStyle]; 
majorGridLineStyle.lineWidth = 0.75; 
majorGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.75]; 

CPTMutableLineStyle *minorGridLineStyle = [CPTMutableLineStyle lineStyle]; 
minorGridLineStyle.lineWidth = 0.25; 
minorGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.1]; 

CPTMutableLineStyle *redLineStyle = [CPTMutableLineStyle lineStyle]; 
redLineStyle.lineWidth = 2.0; 
redLineStyle.lineColor = [[CPTColor redColor] colorWithAlphaComponent:0.5];       

CPTMutableLineStyle *greenLineStyle = [CPTMutableLineStyle lineStyle]; 
greenLineStyle.lineWidth = 2.0; 
greenLineStyle.lineColor = [[CPTColor greenColor] colorWithAlphaComponent:0.5];  

// Axes 
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)self.graph.axisSet; 
CPTXYAxis *x   = axisSet.xAxis; 
x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0"); 
x.majorIntervalLength = [[NSDecimalNumber decimalNumberWithString:@"1"] decimalValue]; 
x.minorTicksPerInterval  = 4; 
x.labelOffset = 3.0f; 
x.title   = @"Time"; 
x.titleOffset = 20.0; 
x.titleLocation = CPTDecimalFromFloat((xmax+xmin)/2); 
x.majorGridLineStyle= majorGridLineStyle; 
x.minorGridLineStyle=minorGridLineStyle; 


CPTXYAxis *y = axisSet.yAxis; 
y.majorIntervalLength   = CPTDecimalFromString(@"1.0"); 
y.majorTickLength=2.0f; 
y.minorTicksPerInterval  = 4; 
y.orthogonalCoordinateDecimal = CPTDecimalFromFloat(0.0); 
y.labelExclusionRanges = [NSArray arrayWithObjects: 
          [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInteger(0.0) 
                 length:CPTDecimalFromInteger(0.0)],Nil]; 
y.majorGridLineStyle= majorGridLineStyle; 
y.minorGridLineStyle=minorGridLineStyle; 


CPTXYAxis *y2 = [[(CPTXYAxis *)[CPTXYAxis alloc] initWithFrame:CGRectZero] autorelease]; 
y2.plotSpace =plotSpace;  
y2.orthogonalCoordinateDecimal = CPTDecimalFromFloat(xmax); 
y2.majorGridLineStyle=majorGridLineStyle; 
y2.minorGridLineStyle=minorGridLineStyle; 
y2.minorTicksPerInterval  = 4; 
y2.majorIntervalLength  = CPTDecimalFromString(@"1.0"); 
y2.labelOffset  = 10.0; 
y2.coordinate   =CPTCoordinateY; 

y2.axisLineStyle  = x.axisLineStyle; 
y2.labelTextStyle    = x.labelTextStyle; 
y2.labelOffset     = -30.0f; 
y2.visibleRange    = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInteger(0) length:CPTDecimalFromInteger(ymax2)]; 


y2.title      = @"Temperature"; 
y2.titleLocation    = CPTDecimalFromInteger(5.0); 
y2.titleTextStyle    =x.titleTextStyle; 
y2.titleOffset     =-45.0f; 
y2.labelExclusionRanges = [NSArray arrayWithObjects: 
          [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInteger(0.0) 
                 length:CPTDecimalFromInteger(0.0)],Nil]; 


self.graph.axisSet.axes = [NSArray arrayWithObjects:x, y, y2, nil]; 

// Create a plot that uses the data source method for red graph 
CPTScatterPlot *redPlot = [[[CPTScatterPlot alloc] init] autorelease]; 
redPlot.identifier = @"red Plot";; 

CPTMutableLineStyle *lineStyle = [[redPlot.dataLineStyle mutableCopy] autorelease]; 
lineStyle.miterLimit  = 1.0f; 
redPlot.dataLineStyle = redLineStyle; 
redPlot.dataSource = self; 
redPlot.interpolation = CPTScatterPlotInterpolationStepped; 

[self.graph addPlot:redPlot]; 

// Create a plot that uses the data source method for green graph 
CPTScatterPlot *greenPlot = [[[CPTScatterPlot alloc] init] autorelease]; 
greenPlot.identifier = @"green Plot";; 

CPTMutableLineStyle *greenlineStyle = [[greenPlot.dataLineStyle mutableCopy] autorelease]; 
greenlineStyle.miterLimit  = 1.0f; 
greenPlot.dataLineStyle = greenLineStyle; 
greenPlot.dataSource = self; 
[self.graph addPlot:greenPlot]; 

// Add some data 
NSMutableArray *newData = [NSMutableArray arrayWithCapacity:100]; 
NSUInteger i; 
for (i = 0; i < 45; i++) { 
    id x = [NSNumber numberWithDouble:i * 0.2]; 
    id y = [NSNumber numberWithDouble:i * rand()/((double)RAND_MAX*5.0) ];   
    [newData addObject:[NSDictionary dictionaryWithObjectsAndKeys: 
     x, @"x",y, @"y",nil]]; 
} 
NSMutableArray *newData1 = [NSMutableArray arrayWithCapacity:100]; 
for (i = 0; i < 45; i++) { 
    id x =[NSNumber numberWithDouble:i * rand()/((double)RAND_MAX*5.0) ]; 
    id y2 = [NSNumber numberWithDouble:i * 0.2]; 
    [newData1 addObject:[NSDictionary dictionaryWithObjectsAndKeys: 
         x, @"x",y2, @"y2",nil]]; 
} 
self.plotData = newData; 
self.plotData2=newData1; 

Answer 1

आप दो y अक्षों अलग तराजू करना चाहते हैं है, तो आप एक और साजिश अंतरिक्ष जोड़ने की जरूरत है। दूसरा भूखंड अंतरिक्ष के लिए एक ही xRange का प्रयोग करें, लेकिन एक अलग yRange, जैसे,

CPTXYPlotSpace *plotSpace2 = [[[CPTXYPlotSpace alloc] init] autorelease]; 
plotSpace2.xRange = plotSpace.xRange; 
plotSpace2.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(ymin) 
               length:CPTDecimalFromFloat(ymax2 - ymin)]; 
[graph addPlotSpace:plotSpace2]; 
y2.plotSpace = plotSpace2; 

का उपयोग majorIntervalLength का प्रयोग करें टिक और ग्रिड लाइन के स्थान को नियंत्रित करने के:

y.majorIntervalLength = CPTDecimalFromFloat((ymax - ymin)/10.0f); 
y2.majorIntervalLength = CPTDecimalFromFloat((ymax2 - ymin)/10.0f);