From 7a7c389f2ffddb4e4170098e4f5facca1fa8b633 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Hannu=20Niemist=C3=B6?= <hannu.niemisto@iki.fi>
Date: Mon, 19 Sep 2016 12:08:31 +0300
Subject: [PATCH] Merged changes from SVN

---
 .../internal/parsing/parser/SCL.grammar       |   2 +-
 .../internal/parsing/parser/SCLLexer.java     |  86 +++---
 .../internal/parsing/parser/SCLParser.dat     | Bin 21048 -> 21064 bytes
 .../internal/parsing/parser/SCLParser.java    |  16 +-
 .../parsing/parser/SCLParserImpl.java         |   5 +-
 .../internal/parsing/parser/SCLPostLexer.java |   7 +-
 .../simantics/scl/compiler/types/Types.java   |   4 +-
 .../scl/compiler/tests/ActiveTests.java       |   5 +-
 .../scl/compiler/tests/scl/EmptyLet.scl       |   9 +
 .../utils/ui/color/ColorAlphaGradient.java    | 256 ++++++++++++++++++
 .../utils/ui/color/ColorGradient.java         |  11 +-
 11 files changed, 339 insertions(+), 62 deletions(-)
 create mode 100644 bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/EmptyLet.scl
 create mode 100644 bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorAlphaGradient.java

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCL.grammar b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCL.grammar
index 6821da83e..500cf3b20 100644
--- a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCL.grammar
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCL.grammar
@@ -187,7 +187,7 @@ stringLiteral
     ;
 
 statements
-    = LBRACE statement (SEMICOLON statement)* RBRACE         # Statements
+    = LBRACE (statement (SEMICOLON statement)*)? RBRACE      # Statements
     ;
 
 statement
diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLLexer.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLLexer.java
index e23a9a17c..e31112790 100644
--- a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLLexer.java
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLLexer.java
@@ -1,12 +1,12 @@
 /* The following code was generated by JFlex 1.6.1 */
 
-package org.simantics.scl.compiler.internal.parsing.parser;
-
-import org.simantics.scl.compiler.internal.parsing.Token;
-import org.simantics.scl.compiler.errors.Locations;
-import org.simantics.scl.compiler.internal.parsing.exceptions.SCLSyntaxErrorException;
-import gnu.trove.list.array.TIntArrayList;
-
+package org.simantics.scl.compiler.internal.parsing.parser;
+
+import org.simantics.scl.compiler.internal.parsing.Token;
+import org.simantics.scl.compiler.errors.Locations;
+import org.simantics.scl.compiler.internal.parsing.exceptions.SCLSyntaxErrorException;
+import gnu.trove.list.array.TIntArrayList;
+
 
 /**
  * This class is a scanner generated by 
@@ -562,20 +562,20 @@ public class SCLLexer {
   private int zzFinalHighSurrogate = 0;
 
   /* user code: */
-    public SCLParserOptions options = SCLParserOptions.DEFAULT;
-    int stringStart;
-    TIntArrayList parenCountStack = new TIntArrayList(2);
-    int parenCount = 0;
-    TIntArrayList stateStack = new TIntArrayList(2);
-
-    StringBuffer string = new StringBuffer();
-    
-    private Token sym(int id) {
-        return new Token(id, yychar, yychar+yylength(), yytext());
-    }
-    private Token sym(int id, String text) {
-        return new Token(id, yychar, yychar+yylength(), text);
-    }
+    public SCLParserOptions options = SCLParserOptions.DEFAULT;
+    int stringStart;
+    TIntArrayList parenCountStack = new TIntArrayList(2);
+    int parenCount = 0;
+    TIntArrayList stateStack = new TIntArrayList(2);
+
+    StringBuffer string = new StringBuffer();
+    
+    private Token sym(int id) {
+        return new Token(id, yychar, yychar+yylength(), yytext());
+    }
+    private Token sym(int id, String text) {
+        return new Token(id, yychar, yychar+yylength(), text);
+    }
 
 
   /**
@@ -900,7 +900,7 @@ public class SCLLexer {
             }
             case 278: break;
             default:
-          {     return sym(SCLTerminals.EOF);
+          {     return sym(SCLTerminals.EOF);
  }
         }
       }
@@ -943,15 +943,15 @@ public class SCLLexer {
             }
           case 101: break;
           case 10: 
-            { --parenCount;
-                    if(parenCount == 0 && !parenCountStack.isEmpty()) { 
-                       parenCount = parenCountStack.removeAt(parenCountStack.size()-1);
-                       string.setLength(0);
-                       stringStart=yychar;
-                       yybegin(stateStack.removeAt(stateStack.size()-1));
-                       return sym(SCLTerminals.CONTINUE_STRING);
-                    }
-                    else
+            { --parenCount;
+                    if(parenCount == 0 && !parenCountStack.isEmpty()) { 
+                       parenCount = parenCountStack.removeAt(parenCountStack.size()-1);
+                       string.setLength(0);
+                       stringStart=yychar;
+                       yybegin(stateStack.removeAt(stateStack.size()-1));
+                       return sym(SCLTerminals.CONTINUE_STRING);
+                    }
+                    else
                        return sym(SCLTerminals.RPAREN);
             }
           case 102: break;
@@ -1036,7 +1036,7 @@ public class SCLLexer {
             }
           case 122: break;
           case 31: 
-            { yybegin(YYINITIAL); 
+            { yybegin(YYINITIAL); 
                     return new Token(SCLTerminals.END_STRING, stringStart, yychar+1, string.toString());
             }
           case 123: break;
@@ -1113,10 +1113,10 @@ public class SCLLexer {
             }
           case 141: break;
           case 50: 
-            { parenCountStack.add(parenCount);
-                    parenCount = 1;
-                    stateStack.add(STRING);
-                    yybegin(YYINITIAL); 
+            { parenCountStack.add(parenCount);
+                    parenCount = 1;
+                    stateStack.add(STRING);
+                    yybegin(YYINITIAL); 
                     return new Token(SCLTerminals.SUSPEND_STRING, stringStart, yychar+1, string.toString());
             }
           case 142: break;
@@ -1129,10 +1129,10 @@ public class SCLLexer {
             }
           case 144: break;
           case 53: 
-            { parenCountStack.add(parenCount);
-                    parenCount = 1;
-                    stateStack.add(LONG_STRING);
-                    yybegin(YYINITIAL); 
+            { parenCountStack.add(parenCount);
+                    parenCount = 1;
+                    stateStack.add(LONG_STRING);
+                    yybegin(YYINITIAL); 
                     return new Token(SCLTerminals.SUSPEND_STRING, stringStart, yychar+1, string.toString());
             }
           case 145: break;
@@ -1145,12 +1145,12 @@ public class SCLLexer {
             }
           case 147: break;
           case 56: 
-            { String text = yytext();
+            { String text = yytext();
                      return sym(SCLTerminals.ID, text.substring(1, text.length()-1));
             }
           case 148: break;
           case 57: 
-            { String text = yytext();
+            { String text = yytext();
                      return sym(SCLTerminals.SYMBOL, text.substring(1, text.length()-1));
             }
           case 149: break;
@@ -1171,7 +1171,7 @@ public class SCLLexer {
             }
           case 153: break;
           case 62: 
-            { yybegin(YYINITIAL); 
+            { yybegin(YYINITIAL); 
                       return new Token(SCLTerminals.END_STRING, stringStart, yychar+3, string.toString());
             }
           case 154: break;
diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParser.dat b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParser.dat
index f17807cb50b5a65ac8b4185c1df3870340716c06..fe5dac3c46f78e291d2ee254261596d2fdb25b19 100644
GIT binary patch
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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParser.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParser.java
index bde7f10b4..ac61c9010 100644
--- a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParser.java
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParser.java
@@ -13,7 +13,7 @@ public abstract class SCLParser {
     public static final boolean TRACE = false;
 
     private static final int INITIAL_CAPACITY = 16;
-    private static final int STATE_COUNT = 323;
+    private static final int STATE_COUNT = 324;
     private static final int TERMINAL_COUNT = 79;
     private static final int NONTERMINAL_COUNT = 49;
     private static final int PRODUCT_COUNT = 126;
@@ -21,7 +21,7 @@ public abstract class SCLParser {
     private static final int[] ACTION_ROW_ID = new int[STATE_COUNT];
     private static final int[] ACTION_COLUMN_ID = new int[TERMINAL_COUNT];
     private static final short[] ACTION_TABLE = new short[5508];
-    private static final int[] ERROR_TABLE = new int[798];
+    private static final int[] ERROR_TABLE = new int[800];
     private static final int[] GOTO_ROW_ID = new int[STATE_COUNT];
     private static final int[] GOTO_COLUMN_ID = new int[NONTERMINAL_COUNT];
     private static final short[] GOTO_TABLE = new short[1620];
@@ -362,19 +362,19 @@ public abstract class SCLParser {
         return parse(0);
     }
     public Object parseCommands() {
-        return parse(308);
+        return parse(309);
     }
     public Object parseImport() {
-        return parse(315);
+        return parse(316);
     }
     public Object parseType() {
-        return parse(317);
+        return parse(318);
     }
     public Object parseExp() {
-        return parse(319);
+        return parse(320);
     }
     public Object parseEquationBlock() {
-        return parse(321);
+        return parse(322);
     }
 
 
@@ -945,7 +945,7 @@ public abstract class SCLParser {
      */
     protected abstract Object reduceFieldDescription();
     /**
-     * statements ::= LBRACE statement (SEMICOLON statement)&#42; RBRACE
+     * statements ::= LBRACE (statement (SEMICOLON (statement SEMICOLON)&#42; statement)?)? RBRACE
      */
     protected abstract Object reduceStatements();
     /**
diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParserImpl.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParserImpl.java
index 680be5e35..bbf944f1e 100644
--- a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParserImpl.java
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLParserImpl.java
@@ -480,8 +480,9 @@ public class SCLParserImpl extends SCLParser {
     @Override
     protected Object reduceStatements() {
         EBlock block = new EBlock();
-        for(int i=1;i<length();i+=2)
-            block.addStatement((Statement)get(i));
+        if(length() > 2)
+            for(int i=1;i<length();i+=2)
+                block.addStatement((Statement)get(i));
         return block;
     }
 
diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLPostLexer.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLPostLexer.java
index 4a446e6e2..866fb8c98 100644
--- a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLPostLexer.java
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCLPostLexer.java
@@ -79,6 +79,10 @@ public class SCLPostLexer {
     }
     
     private void push(Token symbol) {
+        /*System.out.println("TOKEN " + symbol.text + " (" + SCLParser.TERMINAL_NAMES[symbol.id] + ")" +
+                " [" 
+                + Locations.beginOf(symbol.location) + ".." 
+                + Locations.endOf(symbol.location) + "]");*/
         if(queueSize == queue.length)
             queue = Arrays.copyOf(queue, queueSize*2);
         queue[queueSize++] = symbol;
@@ -117,8 +121,6 @@ public class SCLPostLexer {
         int symbolEnd = Locations.endOf(symbol.location);
         
         if(INDENTABLE.contains(prevTokenId) && symbolId != SCLTerminals.LBRACE) {
-            if(prevTokenId == SCLTerminals.LET)
-                indentations.add(-1);
             push(new Token(SCLTerminals.LBRACE, symbolStart, symbolStart, "implicit {"));
             int symbolIndentation = symbolStart-lineStart;
             //System.out.println("symbolIndentation = " + symbolIndentation);
@@ -149,6 +151,7 @@ public class SCLPostLexer {
         case SCLTerminals.LPAREN:
         case SCLTerminals.LBRACKET:
         case SCLTerminals.IF:
+        case SCLTerminals.LET:
             indentations.add(-1);
             push(symbol);
             return;
diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/types/Types.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/types/Types.java
index 5e332742a..5e8c54887 100644
--- a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/types/Types.java
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/types/Types.java
@@ -154,11 +154,13 @@ public class Types {
      * Get the concrete type pointed to by a chain of type meta-variables.
      */
     public static Type canonical(Type type) {
-        while(type instanceof TMetaVar) {
+        if(type instanceof TMetaVar) {
             TMetaVar metaVar = (TMetaVar)type;
             type = metaVar.ref;
             if(type == null)
                 return metaVar;
+            else
+                return metaVar.ref = canonical(type);
         }
         return type;
     }
diff --git a/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/ActiveTests.java b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/ActiveTests.java
index 0b7b52e29..f9533efee 100644
--- a/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/ActiveTests.java
+++ b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/ActiveTests.java
@@ -6,7 +6,7 @@ import org.junit.Test;
 public class ActiveTests extends TestBase {
     
     public ActiveTests() { super("scl"); }
-
+/*
     @Test public void Equations1() { test(); }
     @Test public void MarketModel2() { test(); }
     @Test public void Overloading2() { test(); }
@@ -17,5 +17,8 @@ public class ActiveTests extends TestBase {
     @Ignore
     @Test public void TypeClass2() { test(); }
     @Test public void TypeClassBug2() { test(); }
+  */  
     
+    //@Test public void CityoptSetup() { test(); }
+    @Test public void EmptyLet() { test(); }
 }
diff --git a/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/EmptyLet.scl b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/EmptyLet.scl
new file mode 100644
index 000000000..68c662378
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/EmptyLet.scl
@@ -0,0 +1,9 @@
+import "Prelude"
+
+ex1 = let in 1
+ex2 = let {} in 2
+ex3 = let {a=3} in a 
+
+main = ex1 + ex2 + ex3
+--
+6
\ No newline at end of file
diff --git a/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorAlphaGradient.java b/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorAlphaGradient.java
new file mode 100644
index 000000000..05635dfe1
--- /dev/null
+++ b/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorAlphaGradient.java
@@ -0,0 +1,256 @@
+package org.simantics.utils.ui.color;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Color;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.widgets.Display;
+
+public class ColorAlphaGradient extends ColorGradient {
+	
+	List<Integer> alphaValues;
+	
+	
+	public ColorAlphaGradient() {
+		super();
+		this.alphaValues = new ArrayList<>();
+	}
+	
+	public ColorAlphaGradient(ColorAlphaGradient copyFrom) {
+		super(copyFrom);
+		this.alphaValues = copyFrom.alphaValues;
+    }
+	
+	public ColorAlphaGradient(ColorValue array[], int alphaArray[]) {
+		super(array);
+		if (array.length != alphaArray.length)
+			throw new IllegalArgumentException("Array lenghts do not match.");
+		this.alphaValues = new ArrayList<>(alphaArray.length);
+		for (int a : alphaArray) {
+            alphaValues.add(a);
+        }
+	}
+	
+	public ColorAlphaGradient(ColorValue array[], int alphaArray[], int type) {
+		super(array, type);
+		if (array.length != alphaArray.length)
+			throw new IllegalArgumentException("Array lenghts do not match.");
+		this.alphaValues = new ArrayList<>(alphaArray.length);
+		for (int a : alphaArray) {
+            alphaValues.add(a);
+        }
+	}
+	
+	public ColorAlphaGradient(Collection<ColorValue> values, Collection<Integer> alphaValues) {
+		super(values);
+		if (values.size() != alphaValues.size())
+			throw new IllegalArgumentException("Array lenghts do not match.");
+		this.alphaValues = new ArrayList<>(alphaValues);
+	}
+	
+	public ColorAlphaGradient(Collection<ColorValue> values, Collection<Integer> alphaValues, int type) {
+		super(values, type);
+		if (values.size() != alphaValues.size())
+			throw new IllegalArgumentException("Array lenghts do not match.");
+		this.alphaValues = new ArrayList<>(alphaValues);
+	}
+	
+	 /**
+     * Interpolates color in RGB space
+     * 
+     * @param value
+     * @return
+     */
+    private byte[] getRGBColor(double value) {
+        int index = 1;
+        while (values.get(index).getValue() <= value && index < values.size()-1)
+            index++;
+
+        value -= values.get(index - 1).getValue();
+        value /= (values.get(index).getValue() - values.get(index - 1).getValue());
+        double valuei = 1.0 - value;
+        byte color[] = new byte[] {
+                (byte) Math.min(255.0, Math.floor(value * values.get(index).getColor().getR() + valuei * values.get(index - 1).getColor().getR())),
+                (byte) Math.min(255.0, Math.floor(value * values.get(index).getColor().getG() + valuei * values.get(index - 1).getColor().getG())),
+                (byte) Math.min(255.0, Math.floor(value * values.get(index).getColor().getB() + valuei * values.get(index - 1).getColor().getB())),
+                (byte) Math.min(255.0, Math.floor(value * alphaValues.get(index)              + valuei * alphaValues.get(index - 1)))};
+        return color;
+
+    }
+
+    /**
+     * Interpolates color in HSV space
+     * 
+     * @param value
+     * @return
+     */
+    private byte[] getHSVColor(double value) {
+        int index = 1;
+        while (values.get(index).getValue() <= value && index < values.size()-1)
+            index++;
+
+        value -= values.get(index - 1).getValue();
+        value /= (values.get(index).getValue() - values.get(index - 1).getValue());
+        double valuei = 1.0 - value;
+        double h;
+        if (Float.isNaN(values.get(index).getColor().getH())) {
+            h = values.get(index-1).getColor().getH();
+        } else if (Float.isNaN(values.get(index-1).getColor().getH())) {
+            h = values.get(index).getColor().getH();
+        } else {
+            // selecting shortest direction between hues
+            float angle = values.get(index).getColor().getH() - values.get(index - 1).getColor().getH();
+            if (angle > 180.f)
+                angle -= 360.f;
+            else if (angle < -180.f)
+                angle += 360.f;
+            h = values.get(index - 1).getColor().getH() + value * angle;
+            if (h > 360.f)
+                h -= 360.f;
+            else if (h < 0.f)
+                h+= 360.f;
+        }
+        org.simantics.utils.ui.color.Color interpolated = new org.simantics.utils.ui.color.Color(h, value * values.get(index).getColor().getS() + valuei * values.get(index - 1).getColor().getS(),
+                value * values.get(index).getColor().getV() + valuei * values.get(index - 1).getColor().getV());
+        byte color[] = new byte[] { (byte) interpolated.getR(), (byte) interpolated.getG(), (byte) interpolated.getB(), (byte) Math.min(255.0, Math.floor(value * alphaValues.get(index)              + valuei * alphaValues.get(index - 1)))};
+
+        return color;
+
+    }
+
+    /**
+     * <p>
+     * Returns gradient in array of bytes. Array is RGB order and int contains 3 * requested size of bytes.
+     * </p>
+     * <p>
+     * If gradient contains only one color array is filled with that color
+     * </p>
+     * <p>
+     * if gradient has no colors array is filled with white
+     * </p>
+     * @param size number of pixels
+     * @return gradient in array of bytes
+     */
+    public byte[] getGradientArray(int size) {
+        byte array[] = new byte[size * 4];
+        if (values.size() > 1) {
+            for (int i = 0; i < size; i++) {
+                int index = i * 4;
+                double value = values.get(0).getValue() + (values.get(values.size() - 1).getValue() - values.get(0).getValue()) * (double) i / (double) size;
+                byte color[];
+                if (type == RGB)
+                    color = getRGBColor(value);
+                else
+                    color = getHSVColor(value);
+                array[index] = color[0];
+                array[index + 1] = color[1];
+                array[index + 2] = color[2];
+                array[index + 3] = color[3];
+            }
+        } else if (values.size() == 1) {
+            byte color[] = new byte[3];
+            color[0] = (byte)values.get(0).getColor().getR();
+            color[1] = (byte)values.get(0).getColor().getG();
+            color[2] = (byte)values.get(0).getColor().getB();
+            color[3] = (byte)(int)alphaValues.get(0);
+            for (int i = 0; i < size; i++) {
+                int index = i * 3;
+                array[index] = color[0];
+                array[index + 1] = color[1];
+                array[index + 2] = color[2];
+                array[index + 3] = color[3];
+            }
+        } else {
+            for (int i = 0; i < size; i++) {
+                int index = i * 4;
+                array[index] = (byte)255;
+                array[index + 1] = (byte)255;
+                array[index + 2] = (byte)255;
+                array[index + 3] = (byte)255;
+            }
+        }
+        return array;
+    }
+
+    /**
+     * <p>
+     * Returns gradient in image.
+     * </p>
+     * <p>
+     * If gradient contains only one color image is filled with that color
+     * </p>
+     * <p>
+     * if gradient has no colors image is filled with white
+     * </p>
+     * <p>
+     * Style must be set to  <code>SWT.HORIZONTAL</code> or <code>SWT.VERTICAL</code>
+     * </p>
+     * @param size number of pixels
+     * @return gradient in array of bytes
+     */
+    
+    public Image getGradientImage(int width, int height, int style) {
+        Image image = new Image(Display.getCurrent(), width, height);
+        GC gc = new GC(image);
+        gc.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
+        gc.fillRectangle(0, 0, width, height);
+        if (values.size() > 1) {
+            if (SWT.HORIZONTAL == (style | SWT.HORIZONTAL)) {
+                for (int x = 0; x < width; x++) {
+                    double value = values.get(0).getValue() + (values.get(values.size() - 1).getValue() - values.get(0).getValue()) * (double) x / (double) (width - 1);
+                    byte byteColor[];
+                    if (type == RGB)
+                        byteColor = getRGBColor(value);
+                    else
+                        byteColor = getHSVColor(value);
+                    Color color = new Color(Display.getCurrent(), byteColor[0] & 0xff, byteColor[1] & 0xff, byteColor[2] & 0xff, byteColor[3] & 0xff);
+                    gc.setForeground(color);
+                    gc.drawLine(x, 0, x, height);
+                    color.dispose();
+                }
+            } else if (SWT.VERTICAL == (style | SWT.VERTICAL)){
+                for (int y = 0; y < height; y++) {
+                    double value = values.get(0).getValue() + (values.get(values.size() - 1).getValue() - values.get(0).getValue()) * (double) y
+                            / (double) (height - 1);
+                    byte byteColor[];
+                    if (type == RGB)
+                        byteColor = getRGBColor(value);
+                    else
+                        byteColor = getHSVColor(value);
+                    Color color = new Color(Display.getCurrent(), byteColor[0] & 0xff, byteColor[1] & 0xff, byteColor[2] & 0xff, byteColor[3] & 0xff);
+                    gc.setForeground(color);
+                    gc.drawLine(0, y, width, y);
+                    color.dispose();
+                }
+            } else {
+                gc.dispose();
+                image.dispose();
+                SWT.error(SWT.ERROR_INVALID_ARGUMENT);
+            }
+        } else if (values.size() == 1) {
+            Color color = new Color(Display.getCurrent(), values.get(0).getColor().getR(), values.get(0).getColor().getG(), values.get(0).getColor().getB(), alphaValues.get(0));      
+            gc.setBackground(color);
+            gc.fillRectangle(0, 0, width, height);
+            color.dispose();
+        } else {
+            gc.fillRectangle(0, 0, width, height);
+        }
+        gc.dispose();
+        return image;
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+    	if (super.equals(obj)) {
+    		ColorAlphaGradient cg = (ColorAlphaGradient)obj;
+    		return alphaValues.containsAll(cg.alphaValues);
+    	} else {
+    		return false;
+    	}
+    }
+
+}
diff --git a/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorGradient.java b/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorGradient.java
index a08010f20..56195ce0c 100644
--- a/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorGradient.java
+++ b/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorGradient.java
@@ -38,9 +38,9 @@ public class ColorGradient {
 
     public static final int HSV = 1;
 
-    private ArrayList<ColorValue> values;
+    protected ArrayList<ColorValue> values;
 
-    private int type;
+    protected int type;
     
     public ColorGradient() {
         this.values = new ArrayList<ColorValue>();
@@ -59,7 +59,7 @@ public class ColorGradient {
     }
 
     public ColorGradient(ColorValue array[]) {
-        this.values = new ArrayList<ColorValue>();
+        this.values = new ArrayList<ColorValue>(array.length);
         for (ColorValue c : array) {
             values.add(c);
         }
@@ -295,7 +295,10 @@ public class ColorGradient {
     
     @Override
     public boolean equals(Object obj) {
-        if (!(obj instanceof ColorGradient)) return false;
+    	if (obj == null)
+    		return false;
+    	if (obj.getClass() != getClass())
+    		return false;
         ColorGradient cg = (ColorGradient) obj;
         if (cg.type != type) return false;
         if (values.size()!=cg.values.size()) return false;
-- 
2.47.1