我正在编写一个应用程序,其中我有两个 y 轴和一个 x 轴的图形。左 y 轴的范围从 0 到 20,所以有 20 个majorTick 轴。右 y 轴的范围从 0 到 10,所以我想要左 y 轴为每个备用的majorTickAxis 标记。
这是我的代码片段
//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;