iPhone Core-plot: Chart Zoom In Zoom out, Y axis Bigger, Y axis Smaller

Question

I am now using Core-plot for iPhone chart Development. But it has some requirement i can not reach.

I am now using CorePlot 0.4, example code

Answer 1

I see several questions here:

1. Y-axis scale: Try the CPTAxisLabelingPolicyAutomatic labeling policy on your y-axis. If that doesn't give you enough control, use a different labeling policy and use a plot space delegate to adjust the labeling parameters as the user zooms in and out.

2. Disappearing x-axis: Make it a "floating" axis. For example,

   x.axisConstraints = [CPTConstraints constraintWithLowerOffset:0.0];
   

3. Maximum zoom level: Use the globalXRange and globalYRange plot space properties. If you need more control, you can use a plot space delegate.

4. Scroll bars: This isn't directly supported. You could use a plot space delegate to update the scroll bar position.