Class Compositor.BoostCompositor

java.lang.Object
uk.ac.starlink.ttools.plot2.paper.Compositor
uk.ac.starlink.ttools.plot2.paper.Compositor.BoostCompositor
Enclosing class:
Compositor
public static class Compositor.BoostCompositor extends Compositor
Compositor with boosted saturation. This acts like Compositor.SATURATION except that any pixel with a non-zero alpha has its alpha value boosted to a given minimum. The effect is that even very slightly populated pixels can be visually distinguished from unpopulated pixels, which is not the case for standard saturation composition.
Since:
12 Feb 2013
Author:
Mark Taylor

  • Constructor Details

    • BoostCompositor

      public BoostCompositor(float boost)
      Constructor. The boost value must be in the range 0..1; zero is equivalent to Compositor.SATURATION.
      Parameters:
      boost - minimum alpha output for non-empty pixel

  • Method Details

    • createBuffer

      public Compositor.Buffer createBuffer(int count)
      Description copied from class: Compositor
      Creates a buffer on which compositing operations can be performed.
      Specified by:
      createBuffer in class Compositor
      Parameters:
      count - number of pixel elements in buffer
      Returns:
      new buffer

    • scaleAlpha

      public float scaleAlpha(float alpha)
      Description copied from class: Compositor
      Adjusts an alpha value in accordance with this compositor's policy. It takes an alpha value in the range 0-1 and maps it into the range to be used for output from this compositor.
      Specified by:
      scaleAlpha in class Compositor
      Parameters:
      alpha - input alpha in range 0-1
      Returns:
      adjusted alpha, also in range 0-1

    • getBoost

      public float getBoost()
      Returns the boost value for this compositor.
      Returns:
      boost value in range 0..1

Copyright © 2026 Central Laboratory of the Research Councils. All Rights Reserved.