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IOS CorePlot Dock Vertical Axis

/ Published in: iPhone
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Begin by making the class a CPPlotSpaceDelegate.

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  1. // in the viewDidLoad Method:
  2. // CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace;
  3. // plotSpace.delegate = self;
  4.  
  5. /*
  6.  * "Dock" the Y-axis and only allow horizontal scrolling toward the right.
  7.  */
  8. - (CPPlotRange *)plotSpace:(CPPlotSpace *)space
  9.      willChangePlotRangeTo:(CPPlotRange *)newRange
  10.              forCoordinate:(CPCoordinate)coordinate {
  11.  
  12.     NSLog(@"WillChangePlotRangeTo");
  13.  
  14.     // only allows scrolling to the right
  15.     // remove this to have scrolling in both directions
  16.     if (newRange.locationDouble < 0.0F) {
  17.         newRange.location = CPDecimalFromFloat(0.0);
  18.     }
  19.  
  20.     // Adjust axis to keep them in view at the left and bottom;
  21.     // adjust scale-labels to match the scroll.
  22.     CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet;
  23.     if (coordinate == CPCoordinateX) {
  24.         axisSet.yAxis.orthogonalCoordinateDecimal = newRange.location;
  25.         axisSet.xAxis.titleLocation = CPDecimalFromFloat(newRange.locationDouble +
  26.                                                          (newRange.lengthDouble / 2.0F));
  27.     } else {
  28.         axisSet.xAxis.orthogonalCoordinateDecimal = newRange.location;
  29.         axisSet.yAxis.titleLocation = CPDecimalFromFloat(newRange.locationDouble +
  30.                                                          (newRange.lengthDouble / 2.0F));
  31.     }
  32.  
  33.     return newRange;
  34. }

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