コード例 #1
0
  /**
   * Compute the bounds of the text, if necessary.
   *
   * @param dc the current DrawContext.
   */
  protected void computeBoundsIfNeeded(DrawContext dc) {
    // Do not compute bounds if they are available. Computing text bounds is expensive, so only do
    // this
    // calculation if necessary.
    if (this.bounds != null) return;

    TextRenderer textRenderer =
        OGLTextRenderer.getOrCreateTextRenderer(dc.getTextRendererCache(), this.getFont());

    int width = 0;
    int maxLineHeight = 0;
    this.lineBounds = new Rectangle2D[this.lines.length];

    for (int i = 0; i < this.lines.length; i++) {
      Rectangle2D lineBounds = textRenderer.getBounds(lines[i]);
      width = (int) Math.max(lineBounds.getWidth(), width);

      double thisLineHeight = Math.abs(lineBounds.getY());
      maxLineHeight = (int) Math.max(thisLineHeight, maxLineHeight);

      this.lineBounds[i] = lineBounds;
    }
    this.lineHeight = maxLineHeight;

    // Compute final height using maxLineHeight and number of lines
    this.bounds =
        new Rectangle(
            this.lines.length,
            maxLineHeight,
            width,
            this.lines.length * maxLineHeight + this.lines.length * this.lineSpacing);
  }
コード例 #2
0
  /**
   * Compute the amount of rotation to apply to a label in order to keep it oriented toward its
   * orientation position.
   *
   * @param screenPoint Geographic position of the text, projected onto the screen.
   * @param orientationScreenPoint Orientation position, projected onto the screen.
   * @return The rotation angle to apply when drawing the label.
   */
  protected Angle computeRotation(Vec4 screenPoint, Vec4 orientationScreenPoint) {
    // Determine delta between the orientation position and the label position
    double deltaX = screenPoint.x - orientationScreenPoint.x;
    double deltaY = screenPoint.y - orientationScreenPoint.y;

    if (deltaX != 0) {
      double angle = Math.atan(deltaY / deltaX);
      return Angle.fromRadians(angle);
    } else {
      return Angle.POS90; // Vertical label
    }
  }