Android Colored Half Hour Arcs around a Circle

colored_arcs.java

int[] colors = new int[]{
        getResources().getColor(R.color.flatui_red_1),
        getResources().getColor(R.color.flatui_red_2),
        getResources().getColor(R.color.flatui_orange_1),
        getResources().getColor(R.color.flatui_orange_2),
        getResources().getColor(R.color.flatui_yellow_1),
        getResources().getColor(R.color.flatui_yellow_2),
        getResources().getColor(R.color.flatui_green_1),
        getResources().getColor(R.color.flatui_green_2),
        getResources().getColor(R.color.flatui_blue_1),
        getResources().getColor(R.color.flatui_blue_2),
        getResources().getColor(R.color.flatui_purple_1),
        getResources().getColor(R.color.flatui_purple_2),

        getResources().getColor(R.color.flatui_red_1),
        getResources().getColor(R.color.flatui_red_2),
        getResources().getColor(R.color.flatui_orange_1),
        getResources().getColor(R.color.flatui_orange_2),
        getResources().getColor(R.color.flatui_yellow_1),
        getResources().getColor(R.color.flatui_yellow_2),
        getResources().getColor(R.color.flatui_green_1),
        getResources().getColor(R.color.flatui_green_2),
        getResources().getColor(R.color.flatui_blue_1),
        getResources().getColor(R.color.flatui_blue_2),
        getResources().getColor(R.color.flatui_purple_1),
        getResources().getColor(R.color.flatui_purple_2),
    };

    int NUM_HALF_HOURS = 12 * 2;
    Path[] mHourPaths;
    mHourPaths = new Path[NUM_HALF_HOURS];
    Path hourPath = new Path();
    hourPath.setFillType(Path.FillType.EVEN_ODD);

    RectF fullCircleRect = new RectF(0, 0, getWidth(), getHeight());
    int centerX = getWidth() / 2;
    int centerY = getHeight() / 2;

    for (int halfHour = 0; halfHour < NUM_HALF_HOURS; halfHour++) {
      // circle drawing starts at 3 oclock so need to adjust
      float halfHourAngle = 360f / NUM_HALF_HOURS;
      float quarterHourAngle = halfHourAngle / 2;
      float hourAngle = halfHourAngle * halfHour - quarterHourAngle;
      hourAngle = (hourAngle + 360f * 3 / 4) % 360; // make up for mathematical vs clock degrees
      hourPath.addArc(fullCircleRect, hourAngle, halfHourAngle); // hourSweepAngle covers 2 of these quarter hour sections = 1 half hour section
      hourPath.lineTo(centerX, centerY);
      hourPath.close();
      highlightPaint.setColor(colors[halfHour]);
      canvas.drawPath(hourPath, highlightPaint);
      mHourPaths[halfHour] = new Path(hourPath);
      hourPath.reset();
    }