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Editorial Team
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Asked: 2026-06-10T19:02:54+00:00

I want to draw a line chart, displaying data from a database read. I

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I want to draw a line chart, displaying data from a database read. I use the X-axis to record time, I want the chart to support pan and zoom.

I use core plot, I created one demo, but it gives 4 errors. The other demo work the same wrong. I use Xcode 4.3.3 and iOS 5.1 SDK.

Screenshot of the errors

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1 Answer

  1. Editorial Team

    If you want to allow only horizontal scrolling (and/or zooming) in Core Plot, check out this answer by Jay from another question. Here’s the code from his answer:

    Use this to allow only horizontal scrolling/panning:

    -(CGPoint)plotSpace:(CPTPlotSpace *)space willDisplaceBy:(CGPoint)displacement
{
    return CGPointMake(displacement.x, 0);
}

    Use this to allow only horizontal zooming:

    -(CPTPlotRange *)plotSpace:(CPTPlotSpace *)space willChangePlotRangeTo:(CPTPlotRange *)newRange forCoordinate:(CPTCoordinate)coordinate
{
    if (coordinate == CPTCoordinateY) {
    newRange = ((CPTXYPlotSpace*)space).yRange;
    }
    return newRange;
}

    About the errors you’re getting: they don’t really seem to be directly related to Core Plot. They appear because you haven’t declared the ivars in your header file. (Use of undeclared identifier _titleFont, etc)

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