ZoomInvariantBelowThresholdLabelStyle.java

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package style.zoominvariantlabelstyle;

import com.yworks.yfiles.graph.ILabel;

/**
 * Stops the label from getting smaller in view coordinates if the zoom is
 * less than the style's minimum zoom value.
 */
public class ZoomInvariantBelowThresholdLabelStyle extends AbstractZoomInvariantLabelStyle {
  private double minZoom;

  /**
   * Initializes a new {@code ZoomInvariantBelowThresholdLabelStyle} instance
   * with {@code minZoom} set to {@code 1.0}.
   */
  public ZoomInvariantBelowThresholdLabelStyle() {
    minZoom = 1;
  }

  /**
   * Stops the label from getting smaller in view coordinates if the zoom is
   * less than the style's minimum zoom value.
   * @param label the current label which will be styled
   * @param zoom the current zoom factor
   */
  @Override
  protected double getScaleForZoom( ILabel label, double zoom ) {
    double min = getMinZoom();
    if (zoom > min) {
      return 1;
    }
    return min / zoom;
  }

  /**
   * Gets the minimum zoom value for this style.
   * This style will scale labels only down to this zoom value.
   */
  public double getMinZoom() {
    return minZoom;
  }

  /**
   * Gets the minimum zoom value for this style.
   * This style will scale labels only down to this zoom value.
   */
  public void setMinZoom( double value ) {
    this.minZoom = value;
  }
}