JAL-3746 apply copyright to source

[jalview.git] / src / jalview / gui / Slider.java

diff --git a/src/jalview/gui/Slider.java b/src/jalview/gui/Slider.java
index b913ba0..5dc3351 100644 (file)
--- a/src/jalview/gui/Slider.java
+++ b/src/jalview/gui/Slider.java
@@ -1,3 +1,23 @@
+/*
+ * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
+ * Copyright (C) $$Year-Rel$$ The Jalview Authors
+ * 
+ * This file is part of Jalview.
+ * 
+ * Jalview is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation, either version 3
+ * of the License, or (at your option) any later version.
+ *  
+ * Jalview is distributed in the hope that it will be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty 
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+ * PURPOSE.  See the GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with Jalview.  If not, see <http://www.gnu.org/licenses/>.
+ * The Jalview Authors are detailed in the 'AUTHORS' file.
+ */
 package jalview.gui;
 
 import javax.swing.JSlider;
@@ -16,6 +36,12 @@ import javax.swing.JSlider;
 public class Slider extends JSlider
 {
   /*
+   * the number of nominal positions the slider represents
+   * (higher number = more fine-grained positioning)
+   */
+  private static final int SCALE_TICKS = 1000;
+
+  /*
    * 'true' value corresponding to zero on the slider
    */
   private float trueMin;
@@ -29,7 +55,7 @@ public class Slider extends JSlider
    * scaleFactor applied to true value range to give a
    * slider range of 0 - 100
    */
-  private int sliderScaleFactor;
+  private float sliderScaleFactor;
 
   /**
    * Constructor that rescales min - max to 0 - 100 for the slider
@@ -57,7 +83,7 @@ public class Slider extends JSlider
     trueMin = min;
     trueMax = max;
     setMinimum(0);
-    sliderScaleFactor = (int) (100f / (max - min));
+    sliderScaleFactor = SCALE_TICKS / (max - min);
     int sliderMax = (int) ((max - min) * sliderScaleFactor);
     setMaximum(sliderMax);
     setSliderValue(value);
@@ -75,7 +101,7 @@ public class Slider extends JSlider
      */
     int value = getValue();
     return value == getMaximum() ? trueMax
-            : value / (float) sliderScaleFactor + trueMin;
+            : value / sliderScaleFactor + trueMin;
   }
 
   /**
@@ -85,12 +111,12 @@ public class Slider extends JSlider
    */
   public void setSliderValue(float value)
   {
-    setValue((int) ((value - trueMin) * sliderScaleFactor));
+    setValue(Math.round((value - trueMin) * sliderScaleFactor));
   }
 
   /**
-   * Answers the value of the slider position as a percentage between minimum and
-   * maximum of its range
+   * Answers the value of the slider position as a percentage between minimum
+   * and maximum of its range
    * 
    * @return
    */