JAL-2965 graduated sequence point colour from back to front

[jalview.git] / test / jalview / util / ColorUtilsTest.java

diff --git a/test/jalview/util/ColorUtilsTest.java b/test/jalview/util/ColorUtilsTest.java
index fa4091f..0acd806 100644 (file)
--- a/test/jalview/util/ColorUtilsTest.java
+++ b/test/jalview/util/ColorUtilsTest.java
@@ -243,4 +243,48 @@ public class ColorUtilsTest
     assertEquals(new Color(184, 184, 184),
             ColorUtils.createColourFromName("HELLO HELLO HELLO "));
   }
+
+  /**
+   * Tests for the method that returns a colour graduated between darker() and
+   * brighter()
+   */
+  @Test(groups = { "Functional" })
+  public void testGetGraduatedColour_darkerToBrighter()
+  {
+    final Color colour = new Color(180, 200, 220);
+  
+    /*
+     * value half-way between min and max does _not_ mean colour unchanged
+     * darker (*.7) is (126, 140, 154)
+     * brighter (*1/.7) is (255, 255, 255)
+     * midway is (190, 197, 204)
+     */
+    Color col = ColorUtils.getGraduatedColour(20f, 10f, 30f, colour);
+    assertEquals(190, col.getRed());
+    assertEquals(197, col.getGreen());
+    assertEquals(204, col.getBlue());
+
+    // minValue (or less) returns colour.darker()
+    // - or would do if Color.darker calculated better!
+    col = ColorUtils.getGraduatedColour(10f, 10f, 30f, colour);
+    assertEquals(col, new Color(126, 140, 154));
+    // Color.darker computes 125.999999 and rounds down!
+    assertEquals(new Color(125, 140, 154), colour.darker());
+    col = ColorUtils.getGraduatedColour(-10f, 10f, 30f, colour);
+    assertEquals(new Color(126, 140, 154), col);
+
+    // maxValue (or more) returns colour.brighter()
+    col = ColorUtils.getGraduatedColour(30f, 10f, 30f, colour);
+    assertEquals(colour.brighter(), col);
+    col = ColorUtils.getGraduatedColour(40f, 10f, 30f, colour);
+    assertEquals(colour.brighter(), col);
+
+    /*
+     * 'linear' mid-point between 0.7 and 1/0.7 is 1.057
+     * so the '
+     */
+    Color c = new Color(200, 200, 200);
+    col = ColorUtils.getGraduatedColour(106f, 0f, 200f, c);
+    assertEquals(c, col);
+  }
 }