Animation Issue

[mayuresh21]

In Line chart while updating data that time animation is start from start it should be start from actual values. but it start from start x or y;

[desnyki]

To use have your chart defined in a global mChart variable. and make sure your x-axis has points defined from your x min to x max (ex. graph from 0 to 5 would have x points 0,1,2,3,4,5).

Example call
animateXYAxis(initialData,finalData,2000);

This code only works with a LineChart (you could try and implement different chart compatibility) and has not been thoroughly tested.

Intended use is to take make a copy of your dataSet and make the changes to the copy. Then pass the initial dataset as start and the copy as final. That s how the spacial change vector is calculated.

  private Handler mHandler = new Handler();

    public void animateXYAxis(LineDataSet start,LineDataSet end,int duration){
        float[] dy = new float[start.getEntryCount()];
        float[] dx = new float[start.getEntryCount()];
        int iterations = (duration/1000)*30;
        int iterationDuration = duration/iterations;
        List<Entry> endVals = end.getYVals();
        List<Entry> startVals = start.getYVals();
        for (int i=0;i<dx.length;i++){
            dx[i]=((float)endVals.get(i).getXIndex()-(float)startVals.get(i).getXIndex())/iterations;
            dy[i]=(endVals.get(i).getVal()-startVals.get(i).getVal())/iterations;
        }
        MyXYAnimation renderAnimation = new MyXYAnimation(iterations,iterationDuration,dx,dy,start);
        mHandler.post(renderAnimation);
    }

    public class MyXYAnimation implements Runnable {

        private int iterations;
        private int iterationDuration;
        float[] dx;
        float[] dy;
        LineDataSet setToDisplay;
        int counter =0;
        float xOffset[];
        public MyXYAnimation(int iterations, int iterationDuration, float[] dx, float[] dy, LineDataSet setToDisplay) {
            this.iterations = iterations;
            this.iterationDuration = iterationDuration;
            this.dx = dx;
            this.dy = dy;
            this.setToDisplay = setToDisplay;
            xOffset = new float[dx.length];
            Arrays.fill(xOffset,0);
        }

        @Override
        public void run(){
            for (Entry entry : setToDisplay.getYVals()){
                xOffset[counter%dx.length] += dx[counter%dx.length];
                if(xOffset[counter%dx.length]>=1||xOffset[counter%dx.length]<=-1) {
                    entry.setXIndex( (entry.getXIndex() + (int)xOffset[counter%dx.length]));
                    xOffset[counter%dx.length]-=(int)xOffset[counter%dx.length];
                }
                entry.setVal((entry.getVal()+dy[counter%dy.length]));
                counter++;
            }
            mChart.invalidate();
            iterations--;
            if(iterations>0)
                mHandler.postDelayed(this,iterationDuration);
        }
    }