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Asked: 2026-05-27T23:30:42+00:00

I am trying to understand how to use CorePlot. Previously, I used to use

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I am trying to understand how to use CorePlot. Previously, I used to use google charts to plot my graph.

I am trying to set the axis of my chart to the bottom left and start the 0 from the bottom for both x and y axis. However, I am unable to understand how the code works.

Here is the code – 

// Setup plot space
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(2.0)];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(3.0)];

// Axes
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
CPTXYAxis *x = axisSet.xAxis;
x.majorIntervalLength = CPTDecimalFromString(@"0.5");
x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"2");
x.minorTicksPerInterval = 2;
NSArray *exclusionRanges = [NSArray arrayWithObjects:
    [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.99) length:CPTDecimalFromFloat(0.02)], 
    [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.99) length:CPTDecimalFromFloat(0.02)],
    [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(2.99) length:CPTDecimalFromFloat(0.02)],
    nil];
x.labelExclusionRanges = exclusionRanges;

CPTXYAxis *y = axisSet.yAxis;
y.majorIntervalLength = CPTDecimalFromString(@"0.5");
y.minorTicksPerInterval = 5;
y.orthogonalCoordinateDecimal = CPTDecimalFromString(@"2");
exclusionRanges = [NSArray arrayWithObjects:
    [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.99) length:CPTDecimalFromFloat(0.02)], 
    [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.99) length:CPTDecimalFromFloat(0.02)],
    [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(3.99) length:CPTDecimalFromFloat(0.02)],
    nil];
y.labelExclusionRanges = exclusionRanges;

Would someone be able to tell me what I should do?

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1 Answer

  1. Editorial Team

    To start the graph at (0, 0) you need to change the x and y ranges and intersection points. You can change this by modifying

    plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(2.0)];

    to

    plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0) length:CPTDecimalFromFloat(2.0)];

    and also change the plotRangeWithLocation to 0 for the yRange.

    Also, you need to change this

    x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"2");

    to

    x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0");

    and do the same for orthogonalCoordinateDecimal of y.

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