From 33cdd62c742c9298e09ef97d6a0adddd569636e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ilia=20L=2E=20=E2=84=96250504?= <1lagodich@mail.ru>
Date: Thu, 19 Sep 2024 00:24:02 +0300
Subject: [PATCH 1/4] 1. Color spectrum changed

---
 src/demo/parallel/MandelbrotSetTask.java | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/demo/parallel/MandelbrotSetTask.java b/src/demo/parallel/MandelbrotSetTask.java
index adbb217b8..62dc7f11b 100644
--- a/src/demo/parallel/MandelbrotSetTask.java
+++ b/src/demo/parallel/MandelbrotSetTask.java
@@ -351,20 +351,20 @@ private Color getColor(int count) {
          * Color stops for colors table: color values
          */
         Color[] cc = {
-            Color.rgb(40, 0, 0),
+            Color.VIOLET,
             Color.RED,
             Color.WHITE,
-            Color.RED,
-            Color.rgb(100, 0, 0),
-            Color.RED,
-            Color.rgb(50, 0, 0)
+            Color.CYAN,
+            Color.PURPLE,
+            Color.HOTPINK,
+            Color.MISTYROSE
         };
         
         /**
          * Color stops for colors table: relative position in the table
          */
         double[] cp = {
-            0, 0.17, 0.25, 0.30, 0.5, 0.75, 1,};
+            0, 0.10, 0.20, 0.30, 0.5, 0.70, 1,};
         
         /**
          * Color table population

From 20a3a5cc9f34fc12739b0cb1803b668625b18bbf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ilia=20L=2E=20=E2=84=96250504?= <1lagodich@mail.ru>
Date: Thu, 19 Sep 2024 00:28:39 +0300
Subject: [PATCH 2/4] 2. Fractal equation changed

---
 src/demo/parallel/MandelbrotSetTask.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/demo/parallel/MandelbrotSetTask.java b/src/demo/parallel/MandelbrotSetTask.java
index 62dc7f11b..ec70f26ca 100644
--- a/src/demo/parallel/MandelbrotSetTask.java
+++ b/src/demo/parallel/MandelbrotSetTask.java
@@ -273,7 +273,7 @@ protected Long call() throws Exception {
      */
     private int calc(Complex comp) {
         int count = 0;
-        Complex c = new Complex(0, 0);
+        Complex c = new Complex(0.308, 0);
         do {
             c = c.times(c).plus(comp);
             count++;

From 21b61c1661628245468714cff018ec711a91ce95 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ilia=20L=2E=20=E2=84=96250504?= <1lagodich@mail.ru>
Date: Thu, 19 Sep 2024 00:32:34 +0300
Subject: [PATCH 3/4] 3. Substract added

---
 src/demo/parallel/Complex.java           | 11 +++++++++++
 src/demo/parallel/MandelbrotSetTask.java |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/demo/parallel/Complex.java b/src/demo/parallel/Complex.java
index 134a37946..e36c12088 100644
--- a/src/demo/parallel/Complex.java
+++ b/src/demo/parallel/Complex.java
@@ -71,6 +71,17 @@ public Complex plus(Complex b) {
         return this;
     }
 
+    /**
+     * Substract operation.
+     * @param b minuend
+     * @return this Complex object whose value is (this - b)
+     */
+    public Complex minus(Complex b) {
+        re -= b.re;
+        im -= b.im;
+        return this;
+    }
+
     /**
      * Multiply operation.
      * @param  b multiplier
diff --git a/src/demo/parallel/MandelbrotSetTask.java b/src/demo/parallel/MandelbrotSetTask.java
index ec70f26ca..a09078d63 100644
--- a/src/demo/parallel/MandelbrotSetTask.java
+++ b/src/demo/parallel/MandelbrotSetTask.java
@@ -275,7 +275,7 @@ private int calc(Complex comp) {
         int count = 0;
         Complex c = new Complex(0.308, 0);
         do {
-            c = c.times(c).plus(comp);
+            c = c.times(c).minus(comp);
             count++;
         } while (count < CAL_MAX_COUNT && c.lengthSQ() < LENGTH_BOUNDARY);
         return count;

From 0c24d928ff30e48ec154e758449edaf9ad98ac38 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ilia=20L=2E=20=E2=84=96250504?= <1lagodich@mail.ru>
Date: Thu, 19 Sep 2024 00:51:50 +0300
Subject: [PATCH 4/4] 4. Subtract unit test added

---
 src/demo/parallel/Complex.java          | 10 +++++++++-
 src/test/demo/parallel/ComplexTest.java | 19 +++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 src/test/demo/parallel/ComplexTest.java

diff --git a/src/demo/parallel/Complex.java b/src/demo/parallel/Complex.java
index e36c12088..04b8ce091 100644
--- a/src/demo/parallel/Complex.java
+++ b/src/demo/parallel/Complex.java
@@ -72,7 +72,7 @@ public Complex plus(Complex b) {
     }
 
     /**
-     * Substract operation.
+     * Subtract operation.
      * @param b minuend
      * @return this Complex object whose value is (this - b)
      */
@@ -82,6 +82,14 @@ public Complex minus(Complex b) {
         return this;
     }
 
+    public double getRe() {
+        return re;
+    }
+
+    public double getIm() {
+        return im;
+    }
+
     /**
      * Multiply operation.
      * @param  b multiplier
diff --git a/src/test/demo/parallel/ComplexTest.java b/src/test/demo/parallel/ComplexTest.java
new file mode 100644
index 000000000..20278f2a4
--- /dev/null
+++ b/src/test/demo/parallel/ComplexTest.java
@@ -0,0 +1,19 @@
+package test.demo.parallel;
+
+import demo.parallel.Complex;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ComplexTest {
+
+    @Test
+    public void subtractTest() {
+        Complex a = new Complex(7.0, 2.0);
+        Complex b = new Complex(3.0, 1.0);
+        Complex difference = a.minus(b);
+
+        assertEquals(4.0, difference.getRe(), 1e-10, "Real part must be 4.0" );
+        assertEquals(1.0, difference.getIm(), 1e-10, "Imaginary part must be 1.0");
+    }
+}