DialChart.java 文件源码

/**
 * Draws the chart tick lines.
 * 
 * @param canvas the canvas
 * @param min the minimum chart value
 * @param max the maximum chart value
 * @param minAngle the minimum chart angle value
 * @param maxAngle the maximum chart angle value
 * @param centerX the center x value
 * @param centerY the center y value
 * @param longRadius the long radius
 * @param shortRadius the short radius
 * @param ticks the tick spacing
 * @param paint the paint settings
 * @param labels paint the labels
 * @return the angle
 */
private void drawTicks(Canvas canvas, double min, double max, double minAngle, double maxAngle,
    int centerX, int centerY, double longRadius, double shortRadius, double ticks, Paint paint,
    boolean labels) {
  for (double i = min; i <= max; i += ticks) {
    double angle = getAngleForValue(i, minAngle, maxAngle, min, max);
    double sinValue = Math.sin(angle);
    double cosValue = Math.cos(angle);
    int x1 = Math.round(centerX + (float) (shortRadius * sinValue));
    int y1 = Math.round(centerY + (float) (shortRadius * cosValue));
    int x2 = Math.round(centerX + (float) (longRadius * sinValue));
    int y2 = Math.round(centerY + (float) (longRadius * cosValue));
    canvas.drawLine(x1, y1, x2, y2, paint);
    if (labels) {
      paint.setTextAlign(Align.LEFT);
      if (x1 <= x2) {
        paint.setTextAlign(Align.RIGHT);
      }
      String text = i + "";
      if (Math.round(i) == (long) i) {
        text = (long) i + "";
      }
      canvas.drawText(text, x1, y1, paint);
    }
  }
}