JAL-98 refactor bleachColour() to ColorUtils

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

diff --git a/test/jalview/util/ColorUtilsTest.java b/test/jalview/util/ColorUtilsTest.java
index 2b12a72..77a023f 100644 (file)
--- a/test/jalview/util/ColorUtilsTest.java
+++ b/test/jalview/util/ColorUtilsTest.java
@@ -22,6 +22,7 @@ package jalview.util;
 
 import static org.testng.AssertJUnit.assertEquals;
 import static org.testng.AssertJUnit.assertNull;
+import static org.testng.AssertJUnit.assertSame;
 
 import java.awt.Color;
 
@@ -72,4 +73,87 @@ 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);
+  }
+
+  @Test(groups = { "Functional" })
+  public void testBleachColour()
+  {
+    Color colour = new Color(155, 105, 55);
+    assertSame(colour, ColorUtils.bleachColour(colour, 0));
+    assertEquals(Color.WHITE, ColorUtils.bleachColour(colour, 1));
+    assertEquals(Color.WHITE, ColorUtils.bleachColour(colour, 2));
+    assertEquals(new Color(175, 135, 95),
+            ColorUtils.bleachColour(colour, 0.2f));
+    assertEquals(new Color(225, 210, 195),
+            ColorUtils.bleachColour(colour, 0.7f));
+
+    /*
+     * and some 'negative fade'
+     */
+    assertEquals(Color.BLACK, ColorUtils.bleachColour(colour, -1));
+    assertEquals(Color.BLACK, ColorUtils.bleachColour(colour, -2));
+    assertEquals(new Color(124, 84, 44),
+            ColorUtils.bleachColour(colour, -0.2f));
+    assertEquals(new Color(46, 31, 16), // with rounding down
+            ColorUtils.bleachColour(colour, -0.7f));
+  }
 }