Tag: XAxisDragModifier | Fast, Native Chart Controls for WPF, iOS, Android and Xamarin

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Panning/Dragging on Y axis is moving X axis also

Android zoompanmodifier YAxis Drag XAxisDragModifier YAxisDragModifier

Hello, I have added YAxisDragModifier and ZoomPanModifier to my surface and when I try to drag on Y axis I can move the X axis too and that is not the behavior that I was trying to get. I want when I drag/move YAxis not to move on the YAxis also.

Here is my code:

Surface.ChartModifiers.Add(new PinchZoomModifier());
Surface.ChartModifiers.Add(new ZoomExtentsModifier());
Surface.ChartModifiers.Add(new YAxisDragModifier { DragMode = AxisDragModifierBase.AxisDragMode.Pan });
Surface.ChartModifiers.Add(new XAxisDragModifier { DragMode = AxisDragModifierBase.AxisDragMode.Pan, ClipModeX = ClipMode.None });
Surface.ChartModifiers.Add(new ZoomPanModifier
{
Direction = Direction2D.XDirection,
ZoomExtentsY = false
});

Here is the video with the behavior:
VIDEO: https://drive.google.com/file/d/1kbYi2voKNvHD5J7D6-XDw7OJx4IwlEqr/view

Help please!

Ilija Kocev asked 3 months ago
last active 3 months ago

1 vote

1 answer

1k views

Chart xAxis drag and scroll ratio

Android zoompanmodifier XAxisDragModifier

Hi I am implementing a chart on Android with 24 Hours of data viewable in 1, 2, 4, 8, 12 and 24 hours windows. The chart is drag-able upon the xAxis only. The full extent of the yAxis is always visible.

I am struggling to control the rate of scroll compared to the drag speed. What is desired is always a perceived one to one ratio of movement. This means that a data point’s movement distance when scrolled is the same is the point of touch’s movement distance regardless of zoom level.

I am currently using:

    ChartModifierCollection surfaceChartModifiers =  surface.getChartModifiers();
    XAxisDragModifier dragModifier = new XAxisDragModifier();
    dragModifier.setDragMode(AxisDragModifierBase.AxisDragMode.Pan);
    dragModifier.setClipModeX(ClipMode.ClipAtExtents);
    surfaceChartModifiers.add(dragModifier);

    ZoomPanModifier zoomPanModifier = new ZoomPanModifier();
    zoomPanModifier.setClipModeX(ClipMode.ClipAtExtents);
    zoomPanModifier.setDirection(Direction2D.XDirection);
    zoomPanModifier.setZoomExtentsY(false);
    surfaceChartModifiers.add(zoomPanModifier);

Currently however the ratio does not appear to be one to one the scrolling move further than the touch drag distance.

How can I achieve this?

Simon Barnes asked 9 months ago
last active 8 months ago