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;
}
});