/**
* Get labels position having into account the horizontal padding of text size.
*
* @param nLabels - number of labels to display
*/
private ArrayList<Float> calcLabelsPos(int nLabels) {
final ArrayList<Float> result = new ArrayList<Float>();
if (nLabels == 1)
result.add(
mChartView.getInnerChartLeft()
+ (getInnerChartRight() - mChartView.getInnerChartLeft()) / 2);
else {
final float screenStep =
(getInnerChartRight()
- mChartView.getInnerChartLeft()
- mChartView.style.axisThickness / 2
// if 0 first label will be right at the beginning of the
// axis
- borderSpacing * 2
- mandatoryBorderSpacing * 2)
/ (nLabels - 1);
float pos = mChartView.getInnerChartLeft() + borderSpacing + mandatoryBorderSpacing;
while (pos <= mChartView.chartRight - borderSpacing - mandatoryBorderSpacing) {
result.add(pos);
pos += screenStep;
}
}
return result;
}
public XController(ChartView chartView) {
mChartView = chartView;
// Initialize variables and set defaults
mDistLabelToAxis = (int) (mChartView.getResources().getDimension(R.dimen.axis_dist_from_label));
mandatoryBorderSpacing = 0;
hasAxis = true;
labelsPos = new ArrayList<Float>();
labelsPositioning = LabelPosition.OUTSIDE;
borderSpacing = mChartView.getResources().getDimension(R.dimen.axis_border_spacing);
}
protected void init() {
// Set the vertical display coordinate
mLabelVerCoord = mChartView.chartBottom;
if (labelsPositioning == LabelPosition.INSIDE) mLabelVerCoord -= mDistLabelToAxis;
// In case of mandatory border spacing (ex. BarChart)
if (mandatoryBorderSpacing == 1)
mandatoryBorderSpacing =
(getInnerChartRight() - mChartView.getInnerChartLeft() - borderSpacing * 2)
/ mChartView.data.get(0).size()
/ 2;
labelsPos = calcLabelsPos(mChartView.data.get(0).size());
}
/**
* Method called from onDraw method to draw XController data
*
* @param canvas - Canvas to use while drawing the data.
*/
protected void draw(Canvas canvas) {
// Draw axis
if (hasAxis)
canvas.drawLine(
mChartView.getInnerChartLeft(),
getAxisVerticalPosition(),
getInnerChartRight(),
getAxisVerticalPosition(),
mChartView.style.chartPaint);
// Draw labels
if (labelsPositioning != LabelPosition.NONE) {
mChartView.style.labelPaint.setTextAlign(Align.CENTER);
for (int i = 0; i < mChartView.data.get(0).size(); i++) {
canvas.drawText(
mChartView.data.get(0).getLabel(i),
labelsPos.get(i),
mLabelVerCoord,
mChartView.style.labelPaint);
}
}
}
