MPAndroidChart:让一个图形反映姊妹图形上的缩放/滑动 [英] MPAndroidChart: Have one graph mirror the zoom/swipes on a sister graph

问题描述

我有两个折线图显示了同一时间段内的互补数据.有没有办法将一个图形接收到的任何触摸事件发送到另一个图形?我基本上想要它，以便图形始终显示相同的查看矩形(至少在水平方向上).因此，如果用户在顶部图形上向左滑动n"个单位，底部图形将自动向左滚动n"个单位以进行匹配.

I have two line graphs that show complementary data over the same time period. Is there any way to send any touch events received by one graph to the other? I essentially want it so that the graphs always show the same viewing rectangle (at least on horizontally). So if a user swipes left 'n' units on the top graph, the bottom graph will automatically scroll left 'n' units to match.

推荐答案

可以使用当前的 MPAndroidChart 版本进行缩放，用于滚动签出或等待我的扩展被合并:https://github.com/PhilJay/MPAndroidChart/pull/545

Zooms can be done with the current MPAndroidChart release, for scrolling check out or wait for my extension to be merged: https://github.com/PhilJay/MPAndroidChart/pull/545

您需要在主图上设置一个 OnChartGestureListener 来将平移矩阵值复制到从图:

You need to set up an OnChartGestureListener on the master chart that copies the translation matrix values to the slave charts:

public class CoupleChartGestureListener implements OnChartGestureListener {

    private Chart srcChart;
    private Chart[] dstCharts;

    public CoupleChartGestureListener(Chart srcChart, Chart[] dstCharts) {
        this.srcChart = srcChart;
        this.dstCharts = dstCharts;
    }

    [...other overrides...]

    @Override
    public void onChartScale(MotionEvent me, float scaleX, float scaleY) {
        //Log.d(TAG, "onChartScale " + scaleX + "/" + scaleY + " X=" + me.getX() + "Y=" + me.getY());
        syncCharts();
    }

    @Override
    public void onChartTranslate(MotionEvent me, float dX, float dY) {
        //Log.d(TAG, "onChartTranslate " + dX + "/" + dY + " X=" + me.getX() + "Y=" + me.getY());
        syncCharts();
    }

    public void syncCharts() {
        Matrix srcMatrix;
        float[] srcVals = new float[9];
        Matrix dstMatrix;
        float[] dstVals = new float[9];

        // get src chart translation matrix:
        srcMatrix = srcChart.getViewPortHandler().getMatrixTouch();
        srcMatrix.getValues(srcVals);

        // apply X axis scaling and position to dst charts:
        for (Chart dstChart : dstCharts) {
            if (dstChart.getVisibility() == View.VISIBLE) {
                dstMatrix = dstChart.getViewPortHandler().getMatrixTouch();
                dstMatrix.getValues(dstVals);
                dstVals[Matrix.MSCALE_X] = srcVals[Matrix.MSCALE_X];
                dstVals[Matrix.MTRANS_X] = srcVals[Matrix.MTRANS_X];
                dstMatrix.setValues(dstVals);
                dstChart.getViewPortHandler().refresh(dstMatrix, dstChart, true);
            }
        }
    }

}

然后像这样设置主/从连接:

Then set up your master/slave connections for example like this:

//
// Couple chart viewports:
//

tripChart.setOnChartGestureListener(new CoupleChartGestureListener(
        tripChart, new Chart[] { powerChart, energyChart }));
powerChart.setOnChartGestureListener(new CoupleChartGestureListener(
        powerChart, new Chart[] { tripChart, energyChart }));
energyChart.setOnChartGestureListener(new CoupleChartGestureListener(
        energyChart, new Chart[] { tripChart, powerChart }));

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