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POZooming axes in CorePlot
 

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  1. POZooming axes in CorePlot
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    <p>I have an app where I use CorePlot to plot a graph. I have implemented the zooming of the graph itself with pinch gestures, but I still can't make the labels near the axis (which contain numbers like 1, 2 etc.) zoom properly, so instead of 1 the major interval changes to 5 or 0.5 (or any other number) depending on the pinch gesture.</p> <pre><code>-(void) viewDidAppear { UIPinchGestureRecognizer* rec = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scalePiece:)]; // set options for this recognizer. [self.view addGestureRecognizer:rec]; ... xMajorInterval = 1; yMajorInterval = 1; axisSet = (CPXYAxisSet *)graph.axisSet; axisSet.xAxis.majorIntervalLength = CPDecimalFromFloat(xMajorInterval); axisSet.xAxis.minorTicksPerInterval = 4; axisSet.xAxis.minorTickLength = 4.0f; axisSet.xAxis.majorTickLength = 8.0f; axisSet.xAxis.labelOffset = 1.0f; axisSet.yAxis.majorIntervalLength = CPDecimalFromFloat(yMajorInterval); axisSet.yAxis.minorTicksPerInterval = 4; axisSet.yAxis.minorTickLength = 4.0f; axisSet.yAxis.majorTickLength = 8.0f; axisSet.yAxis.labelOffset = 1.0f; ... } - (void)scalePiece:(UIPinchGestureRecognizer *)gestureRecognizer { //Here I tried to change xMajorInterval and yMajorInterval and redraw axes } </code></pre> <p>Here's how I zoom the plot</p> <pre><code>- (void)scalePiece:(UIPinchGestureRecognizer *)gestureRecognizer { if (PlotSpaceX &gt; -0.1) { if ([gestureRecognizer scale] &gt; 1) { PlotSpaceY = PlotSpaceY - 0.1; PlotSpaceX = PlotSpaceX - 0.1; } } if (PlotSpaceY &gt;= -0.1) { if ([gestureRecognizer scale] &lt; 1){ PlotSpaceY = PlotSpaceY + 0.1; PlotSpaceX = PlotSpaceX + 0.1; } } plotSpace.xRange = [CPPlotRange plotRangeWithLocation:plotSpace.xRange.location length:CPDecimalFromFloat(PlotSpaceX * 2.0)]; plotSpace.yRange = [CPPlotRange plotRangeWithLocation:plotSpace.yRange.location length:CPDecimalFromFloat(PlotSpaceY * 2.0)]; majorInterval = majorInterval*PlotSpaceX/4; intMajorInterval = majorInterval; NSLog(@"%i", intMajorInterval); axisSet.xAxis.majorIntervalLength = CPDecimalFromInt(intMajorInterval); axisSet.yAxis.majorIntervalLength = CPDecimalFromInt(intMajorInterval); } </code></pre> <p>In the scalePiece method I tried to change xMajorInterval and yMajorInterval and redraw axes but, unfortunately, this method is called so often during the pinch gesture that the labels just display huuuge numbers.</p> <p>Can you help me, please?</p>
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    1. COHow are you calculating the new values for majorIntervalLength?
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    2. COThat is my question - how should I change the values of xMajorInterval and yMajorInterval, so the labels display normal user-friendly numbers
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