ios - CALayer doesn't shrink downwards with anchorPoint and setAffineTransform -


i want draw real-time graph (x axis: time, y axis: speed using corelocation) auto-scale in animation. can't control transform of layer.

        ...         view.layer.anchorpoint = cgpointmake(0.5, 0.5)         ...         plotshapelayer.setaffinetransform             (cgaffinetransformmakescale(1.0, 0.5))         ...

enter image description here

i want shrink downwards😩

        ...         view.layer.anchorpoint = cgpointmake(0.0, 0.0)         ...         plotshapelayer.setaffinetransform             (cgaffinetransformmakescale(1.0, 0.5))         ...

enter image description here

the graph goes away...😩

        ...         view.layer.anchorpoint = cgpointmake(0.0, 1.0)         ...         plotshapelayer.setaffinetransform             (cgaffinetransformmakescale(1.0, 0.5))         ...

enter image description here

the graph go away...but graph appeared:

enter image description here

could me? overall code below:

class plotviewcontroller: uiviewcontroller {     var shapelayers: [cashapelayer] = []     var pitchy: cgfloat = 12.0     var ymax: float = 0.0     ...             override func viewwillappear(animated: bool) {         ...         view.layer.anchorpoint = cgpointmake(0.0, 1.0)     }      override func observevalueforkeypath(...)     {         ...             let newvalue = float(model.value)              if ymax < newvalue {                 // when sensed value exceeds display upper limit                 ymax = newvalue                 ...                 plotshapelayer in plotshapelayers {                     plotshapelayer.setaffinetransform                         (cgaffinetransformmakescale(1.0, 0.5))                 }             }     ... }

enter image description here

finally, want code below , fit maximum change of value:

self.setaffinetransform     (cgaffinetransformmakescale(1.0, newpitchy / originalpitchy))

thank help.


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