我正试图在我的androidplot中得到一个值的像素位置,但是我无法让它工作。这样做的目的是将光标放在绘图上显示的精确点上。你们中有人遇到过类似的问题吗?
当做
耶斯珀

最佳答案

我不知道是否有更好的内置解决方案,但这里有一个手动方法。
下面的代码将光标放在用户触摸屏幕的x坐标和绘图的第一个数据系列的相应y坐标处。

//NOTE about XYPlotZoomPan: when an OnTouchListener is set, zooming is disabled. Subclass to avoid it.
mPlot.setOnTouchListener(new View.OnTouchListener(){
    @Override
    public boolean onTouch(View v, MotionEvent me) {
        float touchX = me.getX();
        float touchY = me.getY();
        XYGraphWidget widget = mPlot.getGraphWidget();
        RectF gridRect = widget.getGridRect();
        if(gridRect.contains(touchX, touchY)){ //Check the touch event is in the grid
            XYSeries xyData = mPlot.getSeriesSet().iterator().next();
            long targetValX = Math.round(widget.getXVal(touchX));
            Log.d(TAG, "Touched at " + touchX + ", " + touchY + ". Target val X: " + targetValX);
            Long targetValY = null;
            Long prevValX = null;
            if(mPlot.getSeriesSet().size() > 1){
                Log.w(TAG, "More than one series in plot. Using only the first one");
            }
            for(int i = 0; i < xyData.size(); ++i){
                long currValX = xyData.getX(i).longValue();
                long currValY = xyData.getY(i).longValue();
                //Calculate the range value of the closest domain value (assumes xyData is sorted in ascending X order)
                if(currValX >= targetValX){
                    long currDiff = currValX - targetValX;
                    if(prevValX != null && (targetValX - prevValX) < currDiff){
                        targetValY = xyData.getY(i-1).longValue();
                    }else{
                        targetValY = currValY;
                    }
                    break;
                }
                prevValX = currValX;
            }
            if(targetValY != null){
                long maxValY = mPlot.getCalculatedMaxY().longValue();
                long minValY = mPlot.getCalculatedMinY().longValue();
                float pixelPosY = gridRect.top + ValPixConverter.valToPix(
                        (double)targetValY, (double)minValY, (double)maxValY, (float)gridRect.height(), true);
                widget.setRangeCursorPosition(pixelPosY);
                widget.setDomainCursorPosition(touchX);
                Log.d(TAG, String.format("Domain cursor set at Y %.2f, val %.2f = %d, min-maxValY (%d, %d)",
                        pixelPosY,
                        widget.getRangeCursorVal(), targetValY,
                        minValY, maxValY));
            }else{
                Log.w(TAG, "Couldn't find the closest range to the selected domain coordinate");
            }
            mPlot.invalidate();
        }else{
            Log.d(TAG, "Touched outside the plot grid");
        }

        return false;
    }
});

10-07 19:25
查看更多