X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=test%2Fjalview%2Futil%2FColorUtilsTest.java;fp=test%2Fjalview%2Futil%2FColorUtilsTest.java;h=a82b9c0237b0793e71938066ffcdf19a0b9d0541;hb=99d5f1d805e530f23a53dad4484d44ecd0fbfdf3;hp=2b12a7249ad2f55fd5efd37f9c302748ff0a320f;hpb=e6134bccddc2c7faad28fad1a4e77ccd0ceb3d84;p=jalview.git

diff --git a/test/jalview/util/ColorUtilsTest.java b/test/jalview/util/ColorUtilsTest.java
index 2b12a72..a82b9c0 100644
--- a/test/jalview/util/ColorUtilsTest.java
+++ b/test/jalview/util/ColorUtilsTest.java
@@ -72,4 +72,65 @@ public class ColorUtilsTest
     assertEquals("#800080", ColorUtils.toTkCode(new Color(128, 0, 128))); // purple
     assertEquals("#00ff00", ColorUtils.toTkCode(new Color(0, 255, 0))); // lime
   }
+
+  @Test(groups = { "Functional" })
+  public void testGetGraduatedColour()
+  {
+    Color minColour = new Color(100, 100, 100);
+    Color maxColour = new Color(180, 200, 220);
+
+    /*
+     * value half-way between min and max
+     */
+    Color col = ColorUtils.getGraduatedColour(20f, 10f, minColour, 30f,
+            maxColour);
+    assertEquals(140, col.getRed());
+    assertEquals(150, col.getGreen());
+    assertEquals(160, col.getBlue());
+
+    /*
+     * value two-thirds of the way between min and max
+     */
+    col = ColorUtils
+            .getGraduatedColour(30f, 10f, minColour, 40f, maxColour);
+    assertEquals(153, col.getRed());
+    // Color constructor rounds float value to nearest int
+    assertEquals(167, col.getGreen());
+    assertEquals(180, col.getBlue());
+
+    /*
+     * value = min
+     */
+    col = ColorUtils
+            .getGraduatedColour(10f, 10f, minColour, 30f, maxColour);
+    assertEquals(minColour, col);
+
+    /*
+     * value = max
+     */
+    col = ColorUtils
+            .getGraduatedColour(30f, 10f, minColour, 30f, maxColour);
+    assertEquals(maxColour, col);
+
+    /*
+     * value < min
+     */
+    col = ColorUtils.getGraduatedColour(0f, 10f, minColour, 30f, maxColour);
+    assertEquals(minColour, col);
+
+    /*
+     * value > max
+     */
+    col = ColorUtils
+            .getGraduatedColour(40f, 10f, minColour, 30f,
+            maxColour);
+    assertEquals(maxColour, col);
+
+    /*
+     * min = max
+     */
+    col = ColorUtils
+            .getGraduatedColour(40f, 10f, minColour, 10f, maxColour);
+    assertEquals(minColour, col);
+  }
 }