I’m trying to display text on the left of the LimitLine like this:
However these are the only options I’m getting for setting the position of the Label for limit line.
I’m using LimitLine.LimitLabelPosition.LEFT_TOP and it only displays the Label above the Limit line.
YAxis leftAxis = mChart.getAxisLeft(); LimitLine minimumLimit = new LimitLine(50f, "Minimum Limit"); minimumLimit.setLineWidth(0.5f); minimumLimit.setTextColor(ContextCompat.getColor(this, R.color.white_60_opacity)); minimumLimit.setLabelPosition(LimitLine.LimitLabelPosition.LEFT_TOP); leftAxis.addLimitLine(minimumLimit);
How do I display the LimitLine‘s Label to the left of the LimitLine?
Edit:
I have also tried used the methods .setXOffset(50f) and .setYOffset(50f) but this only shifts the position of the label and not the line minimumLimit.
Answer
You can achieve this by using a custom YAxisRenderer with a little modification of the override method public void renderLimitLines(Canvas c).
The modifications needed for this purpose are:
1.To calculate the label width of each limit line to be able to move the limit line to the correct x position like below:
limitLinePath.moveTo(mViewPortHandler.contentLeft()+getLabelTextWidth(l), pts[1]);
2.To draw the label to the new x,y position something like this:
c.drawText(label, mViewPortHandler.contentLeft() + xOffset, pts[1]+l.getYOffset(), mLimitLinePaint);
Below is a custom MyYAxisRenderer containing the above modifications:
public class MyYAxisRenderer extends YAxisRenderer {
private final Paint textPaint;
public MyYAxisRenderer(ViewPortHandler viewPortHandler, YAxis yAxis, Transformer trans) {
super(viewPortHandler, yAxis, trans);
textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
}
@Override
public void renderLimitLines(Canvas c) {
List<LimitLine> limitLines = mYAxis.getLimitLines();
if (limitLines == null || limitLines.size() <= 0)
return;
float[] pts = mRenderLimitLinesBuffer;
pts[0] = 0;
pts[1] = 0;
Path limitLinePath = mRenderLimitLines;
limitLinePath.reset();
for (int i = 0; i < limitLines.size(); i++) {
LimitLine l = limitLines.get(i);
if (!l.isEnabled())
continue;
int clipRestoreCount = c.save();
mLimitLineClippingRect.set(mViewPortHandler.getContentRect());
mLimitLineClippingRect.inset(0.f, -l.getLineWidth());
c.clipRect(mLimitLineClippingRect);
mLimitLinePaint.setStyle(Paint.Style.STROKE);
mLimitLinePaint.setColor(l.getLineColor());
mLimitLinePaint.setStrokeWidth(l.getLineWidth());
mLimitLinePaint.setPathEffect(l.getDashPathEffect());
pts[1] = l.getLimit();
mTrans.pointValuesToPixel(pts);
limitLinePath.moveTo(mViewPortHandler.contentLeft()+getLabelTextWidth(l), pts[1]);
limitLinePath.lineTo(mViewPortHandler.contentRight(), pts[1]);
c.drawPath(limitLinePath, mLimitLinePaint);
limitLinePath.reset();
String label = l.getLabel();
// if drawing the limit-value label is enabled
if (label != null && !label.equals("")) {
mLimitLinePaint.setStyle(l.getTextStyle());
mLimitLinePaint.setPathEffect(null);
mLimitLinePaint.setColor(l.getTextColor());
mLimitLinePaint.setTypeface(l.getTypeface());
mLimitLinePaint.setStrokeWidth(0.5f);
mLimitLinePaint.setTextSize(l.getTextSize());
final float labelLineHeight = Utils.calcTextHeight(mLimitLinePaint, label);
float xOffset = getLimitLineXOffset(l);
float yOffset = l.getLineWidth() + labelLineHeight + l.getYOffset();
final LimitLine.LimitLabelPosition position = l.getLabelPosition();
//draw the label on the left in the same y position of the limit line
mLimitLinePaint.setTextAlign(Paint.Align.LEFT);
c.drawText(label,
mViewPortHandler.contentLeft() + xOffset,
pts[1]+l.getYOffset(), mLimitLinePaint);
}
c.restoreToCount(clipRestoreCount);
}
}
private float getLimitLineXOffset(LimitLine l){
return Utils.convertDpToPixel(4f) + l.getXOffset();
}
private float getLabelTextWidth(LimitLine l) {
String label = l.getLabel();
if (label != null && !label.equals("")) {
textPaint.setStyle(l.getTextStyle());
textPaint.setPathEffect(null);
textPaint.setColor(l.getTextColor());
textPaint.setTypeface(l.getTypeface());
textPaint.setStrokeWidth(0.5f);
textPaint.setTextSize(l.getTextSize());
int textWidth = Utils.calcTextWidth(textPaint, label);
float xOffset = getLimitLineXOffset(l);
return textWidth + (xOffset*2);
}
return 0;
}
}
In the above renderer i have added two helper functions one for the calculation of the label text width private float getLabelTextWidth(LimitLine l) for a specific limit line and one to get the x offset of each limit line private float getLimitLineXOffset(LimitLine l) which you can modify based on your needs.
And you can use the above Renderer like the below:
lineChart.setRendererLeftYAxis(new MyYAxisRenderer(lineChart.getViewPortHandler(), lineChart.getAxisLeft(), lineChart.getTransformer(YAxis.AxisDependency.LEFT)));
Result:
Note: This was tested with v3.1.0 (‘com.github.PhilJay:MPAndroidChart:v3.1.0’)