Make rainbow more nyan-like

.gitignore

@@ -0,0 +1,94 @@
+
+# Created by https://www.gitignore.io/api/java,intellij
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/dictionaries
+
+# Sensitive or high-churn files:
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.xml
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+
+# Gradle:
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# CMake
+cmake-build-debug/
+
+# Mongo Explorer plugin:
+.idea/**/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Ruby plugin and RubyMine
+/.rakeTasks
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+# .idea/misc.xml
+# *.ipr
+
+# Sonarlint plugin
+.idea/sonarlint
+
+### Java ###
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+
+# End of https://www.gitignore.io/api/java,intellij

src/NyanProgressBarUi.java

@@ -15,13 +15,7 @@
 import java.awt.geom.*;
 
 public class NyanProgressBarUi extends BasicProgressBarUI {
-    private static final float ONE_OVER_SEVEN = 1f / 7;
-    private static final Color VIOLET = new Color(90, 0, 157);
 
-
-    {
-
-    }
     @SuppressWarnings({"MethodOverridesStaticMethodOfSuperclass", "UnusedDeclaration"})
     public static ComponentUI createUI(JComponent c) {
         c.setBorder(JBUI.Borders.empty().asUIResource());
@@ -74,9 +68,7 @@ protected void paintIndeterminate(Graphics g2d, JComponent c) {
         int h = c.getPreferredSize().height;
         if (!isEven(c.getHeight() - h)) h++;
 
-        LinearGradientPaint baseRainbowPaint = new LinearGradientPaint(0, JBUI.scale(2), 0, h - JBUI.scale(6),
-                new float[]{ONE_OVER_SEVEN * 1, ONE_OVER_SEVEN * 2, ONE_OVER_SEVEN * 3, ONE_OVER_SEVEN * 4, ONE_OVER_SEVEN * 5, ONE_OVER_SEVEN * 6, ONE_OVER_SEVEN * 7},
-                new Color[]{Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.cyan, Color.blue, VIOLET});
+        LinearGradientPaint baseRainbowPaint = getRainbowPaintFromHeight(h);
 
         g.setPaint(baseRainbowPaint);
 
@@ -88,11 +80,6 @@ protected void paintIndeterminate(Graphics g2d, JComponent c) {
         g.translate(0, (c.getHeight() - h) / 2);
         int x = -offset;
 
-
-//        LinearGradientPaint baseRainbowPaint = new LinearGradientPaint(0, JBUI.scale(2), 0, h - JBUI.scale(6),
-//                new float[]{ONE_OVER_SEVEN * 1, ONE_OVER_SEVEN * 2, ONE_OVER_SEVEN * 3, ONE_OVER_SEVEN * 4, ONE_OVER_SEVEN * 5, ONE_OVER_SEVEN * 6, ONE_OVER_SEVEN * 7},
-//                new Color[]{Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.cyan, Color.blue, VIOLET});
-
         Paint old = g.getPaint();
         g.setPaint(baseRainbowPaint);
 
@@ -204,9 +191,7 @@ protected void paintDeterminate(Graphics g, JComponent c) {
         g2.setColor(c.getParent().getBackground());
         g2.fill(new RoundRectangle2D.Float(off, off, w - 2f*off - off, h - 2f*off - off, R, R));
 //        g2.setColor(progressBar.getForeground());
-        g2.setPaint(new LinearGradientPaint(0, JBUI.scale(2), 0, h - JBUI.scale(6),
-                new float[]{ONE_OVER_SEVEN * 1, ONE_OVER_SEVEN * 2, ONE_OVER_SEVEN * 3, ONE_OVER_SEVEN * 4, ONE_OVER_SEVEN * 5, ONE_OVER_SEVEN * 6, ONE_OVER_SEVEN * 7},
-                new Color[]{Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.cyan, Color.blue, VIOLET}));
+        g2.setPaint(getRainbowPaintFromHeight(h));
 
         NyanIcons.CAT_ICON.paintIcon(progressBar, g2, amountFull - JBUI.scale(10), -JBUI.scale(6));
         g2.fill(new RoundRectangle2D.Float(2f*off,2f*off, amountFull - JBUI.scale(5f), h - JBUI.scale(5f), JBUI.scale(7f), JBUI.scale(7f)));
@@ -258,6 +243,29 @@ private void paintString(Graphics g, int x, int y, int w, int h, int fillStart,
         g2.setClip(oldClip);
     }
 
+    /** Create a gradient such as [0, 0.99, 1, 1.99, ...], [RED, RED, ORANGE, ORANGE, ..] */
+    private LinearGradientPaint getRainbowPaintFromHeight(float scaledHeight) {
+
+        int numRainbowColors = RainbowColors.RAINBOW_ARRAY.length;
+        float epsilon = 0.000001f;
+
+        float[] fractionList = new float[numRainbowColors * 2];
+        Color[] colorList = new Color[numRainbowColors * 2];
+
+        for (int i = 0; i < numRainbowColors; i++) {
+            fractionList[i * 2] = (float) i / numRainbowColors;
+            fractionList[i * 2 + 1] = ((i + 1) - epsilon) / numRainbowColors;
+
+            colorList[i * 2] = RainbowColors.RAINBOW_ARRAY[i];
+            colorList[i * 2 + 1] = RainbowColors.RAINBOW_ARRAY[i];
+        }
+
+        return new LinearGradientPaint(0, JBUI.scale(1),
+                0, scaledHeight - JBUI.scale(3),
+                fractionList, colorList);
+    }
+
+
     @Override
     protected int getBoxLength(int availableLength, int otherDimension) {
         return availableLength;

src/RainbowColors.java

@@ -0,0 +1,12 @@
+import java.awt.*;
+
+public class RainbowColors {
+    static final Color RED = new Color(255, 0, 0);
+    static final Color ORANGE = new Color(255, 154, 0);
+    static final Color YELLOW = new Color(255, 255, 0);
+    static final Color GREEN = new Color(25, 255, 0);
+    static final Color BLUE = new Color(0, 150, 255);
+    static final Color VIOLET = new Color(100, 30, 255);
+
+    static final Color[] RAINBOW_ARRAY = new Color[]{RED, ORANGE, YELLOW, GREEN, BLUE, VIOLET};
+}