Coreplot：图形中两点之间的自定义空间

Question

如何在图中的数据点之间实现自定义空间，如下图所示，使用Objective c

CGRect bounds = self.graphView.bounds;
CPTGraph *graph = [[CPTXYGraph alloc] initWithFrame:bounds];
self.graphView.hostedGraph = graph;

// graph.plotAreaFrame.paddingTop    += 25.0;
graph.plotAreaFrame.paddingLeft   += 55.0;
graph.plotAreaFrame.paddingBottom += 70.0;
graph.plotAreaFrame.paddingRight  += 20.0;

// Grid line styles
CPTMutableLineStyle *majorGridLineStyle = [CPTMutableLineStyle lineStyle];
majorGridLineStyle.lineWidth = 0.75;
majorGridLineStyle.lineColor =  self.line1Color;
//[[CPTColor colorWithGenericGray:0.2] colorWithAlphaComponent:0.75];

CPTLineCap *lineCap = [CPTLineCap sweptArrowPlotLineCap];
lineCap.size = CGSizeMake(15.0, 15.0);

// Axes
// Label x axis with a fixed interval policy
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
CPTXYAxis *x          = axisSet.xAxis;

x.majorIntervalLength = CPTDecimalFromInt(1);
x.labelingOrigin = @(0).decimalValue;
int i = 0;
NSMutableArray *customLabels = [NSMutableArray new];
NSMutableArray *titleLocations = [NSMutableArray new];
for (NSMutableDictionary *v in self.values)
{
    CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText:[[v valueForKey:@"x"] toDDMMYYYYString] textStyle:x.labelTextStyle];
    newLabel.tickLocation = [[NSNumber numberWithInt:i] decimalValue];
    newLabel.offset          = x.labelOffset + x.majorTickLength;
    newLabel.rotation = M_PI/2.0f;
    [customLabels addObject:newLabel];
    [titleLocations addObject:[NSNumber numberWithInt:i ]];
    i++;
}

x.labelingPolicy = CPTAxisLabelingPolicyNone;
x.majorTickLocations = [NSSet setWithArray:titleLocations];
x.axisLabels = [NSSet setWithArray:customLabels];
x.majorGridLineStyle = majorGridLineStyle;
x.axisConstraints             = [CPTConstraints constraintWithLowerOffset:0.0];

x.labelingOrigin = @(0).decimalValue;
x.orthogonalCoordinateDecimal = [NSDecimalNumber zero].decimalValue;
lineCap.lineStyle = x.axisLineStyle;
lineCap.fill      = [CPTFill fillWithColor:lineCap.lineStyle.lineColor];

// Label y with an automatic label policy.
CPTXYAxis *y = axisSet.yAxis;
y.labelingPolicy              = CPTAxisLabelingPolicyAutomatic;
y.majorGridLineStyle          = majorGridLineStyle;
y.axisConstraints             = [CPTConstraints constraintWithLowerOffset:0.0];
y.labelOffset                 = 10.0;
y.minorTicksPerInterval = 0;`

我已经给出了以下 xrange 和 yrange

if(self.values.count>5){
        plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(self.pt) length:CPTDecimalFromFloat( MAX(self.values.count, 6))];
        plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(min) length:CPTDecimalFromFloat(max)];
}else{
        plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(self.pt) length:CPTDecimalFromFloat( MIN(self.values.count, 3))];
        plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(min) length:CPTDecimalFromFloat(max)];
}

Answer 1

数据源为每个数据点提供 x 值和 y 值。这些值不必均匀分布。轴标签由labelingPolicy 控制。使用提供的位置或“无”策略来提供您自己的标签和/或勾选位置。