private void drawLeftAxisLabel(Canvas canvas, int position) {
Paint axisLabelPaint = labelPaints[LEFT];
String text = getLeftLabel(position);
if (position == 0) {
canvas.drawText(text, 0, -axisLabelPaint.ascent(), axisLabelPaint);
} else if (position == HORIZONTAL_LINE_NUMBER) {
float y =
chartView.getContentHeight() + (axisLabelPaint.ascent() + axisLabelPaint.descent()) / 2;
canvas.drawText(text, 0, y, axisLabelPaint);
} else {
float y = position / (float) HORIZONTAL_LINE_NUMBER * chartView.getContentHeight();
y = y - (axisLabelPaint.ascent() + axisLabelPaint.descent()) / 2;
canvas.drawText(text, 0, y, axisLabelPaint);
}
}
private void computeLeftAxisMinAndMax() {
int start = ((KLineChartView) chartView).getCandleStartIndex();
int end = ((KLineChartView) chartView).getCandleEndIndex();
if (start < 0) {
return;
}
List<QuoteData> quoteDataList = chartView.getChartData().getQuoteDataList();
min = quoteDataList.get(start).low;
max = quoteDataList.get(start).high;
for (int i = start; i <= end; i++) {
QuoteData current = quoteDataList.get(i);
if (min > current.low) {
min = current.low;
}
if (max < current.high) {
max = current.high;
}
}
min -= (max - min) * 0.03;
max += (max - min) * 0.03;
}
public KLineAxisRenderer(ChartView chartView) {
this.chartView = chartView;
labelTextSize = Util.dp2px(chartView.getResources(), LABEL_SIZE);
for (int i = 0; i < 4; i++) {
linePaints[i].setColor(lineColor);
labelPaints[i].setColor(AXIS_LABEL_COLOR_WHITE);
labelPaints[i].setTextSize(labelTextSize);
}
}
@Override
public void drawHorizontalLines(Canvas canvas) {
Paint paint = linePaints[LEFT];
paint.setColor(borderColor);
canvas.drawLine(0, 0, chartView.getWidth(), 0, linePaints[LEFT]);
paint.setColor(lineColor);
for (int i = 1; i < HORIZONTAL_LINE_NUMBER; i++) {
float yPos = (i / (float) HORIZONTAL_LINE_NUMBER) * chartView.getContentHeight();
canvas.drawLine(0, yPos, chartView.getWidth(), yPos, linePaints[LEFT]);
}
paint.setColor(borderColor);
canvas.drawLine(
0, chartView.getContentHeight(), chartView.getWidth(), chartView.getContentHeight(), paint);
}
@Override
public void drawVerticalLines(Canvas canvas) {
Paint linePaint = linePaints[BOTTOM];
linePaint.setColor(borderColor);
canvas.drawLine(0, 0, 0, chartView.getContentHeight(), linePaint);
linePaint.setColor(lineColor);
for (int i = 1; i < VERTICAL_LINE_NUMBER; i++) {
float x = (i / (float) VERTICAL_LINE_NUMBER) * chartView.getWidth();
canvas.drawLine(x, 0, x, chartView.getContentHeight(), linePaint);
}
linePaint.setColor(borderColor);
canvas.drawLine(
chartView.getWidth() - 1,
0,
chartView.getWidth() - 1,
chartView.getContentHeight(),
linePaint);
}