/** Draws the x-labels of the chart. */
private void drawXLabels() {
if (!mDrawXLabels) return;
mXLabelPaint.setTypeface(mXLabels.getTypeface());
mXLabelPaint.setTextSize(mXLabels.getTextSize());
mXLabelPaint.setColor(mXLabels.getTextColor());
float sliceangle = getSliceAngle();
// calculate the factor that is needed for transforming the value to
// pixels
float factor = getFactor();
PointF c = getCenterOffsets();
for (int i = 0; i < mCurrentData.getXValCount(); i++) {
String text = mCurrentData.getXVals().get(i);
float angle = (sliceangle * i + mRotationAngle) % 360f;
PointF p = getPosition(c, mYChartMax * factor + mXLabels.mLabelWidth / 2f, angle);
mDrawCanvas.drawText(text, p.x, p.y + mXLabels.mLabelHeight / 2f, mXLabelPaint);
}
}
/** setup the x-axis labels */
private void prepareXLabels() {
StringBuffer a = new StringBuffer();
int max = (int) Math.round(mCurrentData.getXValAverageLength());
for (int i = 0; i < max; i++) {
a.append("h");
}
mXLabels.mLabelWidth = Utils.calcTextWidth(mXLabelPaint, a.toString());
mXLabels.mLabelHeight = Utils.calcTextWidth(mXLabelPaint, "Q");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow()
.setFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_linechart);
tvX = (TextView) findViewById(R.id.tvXMax);
tvY = (TextView) findViewById(R.id.tvYMax);
mSeekBarX = (SeekBar) findViewById(R.id.seekBar1);
mSeekBarY = (SeekBar) findViewById(R.id.seekBar2);
mSeekBarX.setProgress(45);
mSeekBarY.setProgress(100);
mSeekBarY.setOnSeekBarChangeListener(this);
mSeekBarX.setOnSeekBarChangeListener(this);
mChartView = (ChartView) findViewById(R.id.chart1);
mChart = (LineChart) mChartView.getChart();
mChart.setOnChartValueSelectedListener(this);
// if enabled, the chart will always start at zero on the y-axis
mChart.setStartAtZero(true);
// enable the drawing of values into the chart
mChart.setDrawYValues(true);
mChart.setDrawBorder(true);
mChart.setBorderPositions(new BorderPosition[] {BorderPosition.BOTTOM});
// no description text
mChart.setDescription("");
// invert the y-axis
mChart.setInvertYAxisEnabled(true);
// enable value highlighting
mChart.setHighlightEnabled(true);
// enable touch gestures
mChart.setTouchEnabled(true);
// enable scaling and dragging
mChart.setDragEnabled(true);
mChart.setScaleEnabled(true);
// if disabled, scaling can be done on x- and y-axis separately
mChart.setPinchZoom(true);
// set an alternative background color
// mChart.setBackgroundColor(Color.GRAY);
// create a custom MarkerView (extend MarkerView) and specify the layout
// to use for it
MyMarkerView mv = new MyMarkerView(this, R.layout.custom_marker_view);
// define an offset to change the original position of the marker
// (optional)
mv.setOffsets(-mv.getMeasuredWidth() / 2, -mv.getMeasuredHeight());
// set the marker to the chart
mChart.setMarkerView(mv);
// enable/disable highlight indicators (the lines that indicate the
// highlighted Entry)
mChart.setHighlightIndicatorEnabled(false);
XLabels xl = mChart.getXLabels();
xl.setAvoidFirstLastClipping(true);
// add data
setData(25, 50);
// // restrain the maximum scale-out factor
// mChart.setScaleMinima(3f, 3f);
//
// // center the view to a specific position inside the chart
// mChart.centerViewPort(10, 50);
// get the legend (only possible after setting data)
Legend l = mChart.getLegend();
// modify the legend ...
// l.setPosition(LegendPosition.LEFT_OF_CHART);
l.setForm(LegendForm.LINE);
// dont forget to refresh the drawing
mChartView.invalidate();
}