private void highlightPoints(Canvas canvas) {
        int lineIndex = selectedValue.getFirstIndex();
        Line line = dataProvider.getLineChartData().getLines().get(lineIndex);
        drawPoints(canvas, line, lineIndex, MODE_HIGHLIGHT);
    }
Draws lines, uses path for drawing filled area on software canvas. Line is drawn with canvas.drawLines() method.
hellocharts-library/src/lecho/lib/hellocharts/renderer/LineChartRenderer.java