add rainbow vine example

Author: mikebarkmin

README.md

@@ -243,6 +243,14 @@ An example with heavy use of the ScratchPen. It also plays an sound file in the
 
 ![pipes example](web/assets/pipes.gif)
 
+### Rainbow Vine
+
+Source Code: https://github.com/mikebarkmin/processing-library-scratch/tree/master/examples/RainbowVine
+
+An example which makes use a mouse events.
+
+![rainbow vine example](web/assets/rainbow_vine.gif)
+
 ## Missing
 
 * blocks which are not listed above are currently missing

examples/RainbowVine/RainbowVine.pde

@@ -2,38 +2,48 @@ import eu.barkmin.processing.scratch.*;
 
 ScratchStage stage;
 
-ArrayList<ScratchSprite> sprites = new ArrayList();
 VineSprite vine;
 
 void setup() {
   size(800, 600);
   ScratchStage.init(this);
   stage = ScratchStage.getInstance();
   stage.setColor(0, 0, 0);
+  
   vine = new VineSprite();
-  sprites.add(vine);
 }
 
 void draw() {
-  for(int i = 0; i < sprites.size(); i++) {
-    sprites.get(i).draw();
-  }
-  sprites.add(new LeafSprite(vine));
+  vine.draw(); 
 }
 
 class VineSprite extends ScratchSprite {
+  
+  ArrayList<LeafSprite> leafs = new ArrayList();
+  int lastSpawnTime;
+  
   VineSprite() {
     super("vine", "sprites/vine.png");
+    this.lastSpawnTime = millis();
     this.getPen().down();
     this.getPen().setSize(3);
+    this.getPen().setColor(120);
     this.hide();
   }
 
   void draw() {
     super.draw();
     this.setPosition(ScratchStage.parent.mouseX, ScratchStage.parent.mouseY);
-    this.getPen().changeColor(10);
     this.turnRight(5);
+    
+    for(int i = 0; i < leafs.size(); i++) {
+      leafs.get(i).draw();
+    }
+    
+    if ((millis() - lastSpawnTime) > 20) {
+      leafs.add(new LeafSprite(vine));
+      lastSpawnTime = millis();
+    }
   }
 }
 
@@ -48,7 +58,10 @@ class LeafSprite extends ScratchSprite {
     this.startMillis = millis();
     this.vine = vine;
     this.setRotation(vine.getRotation());
+    // use current color from vine for pen
     this.getPen().setColor(vine.getPen().getColor());
+    // update vine color with every leaf spawn
+    vine.getPen().changeColor(2);
     this.setPosition((int) vine.getX(), (int) vine.getY());
     this.hide();
   }
@@ -57,9 +70,13 @@ class LeafSprite extends ScratchSprite {
     super.draw();
     this.turnRight(5);
     this.move(10);
+    
+    // slowly increase pen size
     this.getPen().changeSize(1);
-    if ((millis() - this.startMillis) / 1000.0 >= 0.2) {
-      sprites.remove(this);
+    
+    // remove leaf after 200ms
+    if ((millis() - this.startMillis) >= 200) {
+      this.vine.leafs.remove(this);
     }
   }
 }

src/eu/barkmin/processing/scratch/ScratchColor.java

@@ -8,6 +8,10 @@ public class ScratchColor {
     private float g = 255;
     private float b = 255;
 
+    private float h = 255;
+    private float s = 255;
+    private float l = 255;
+
     public ScratchColor() {
     }
 
@@ -20,6 +24,10 @@ public ScratchColor(ScratchColor c) {
         this.r = c.r;
         this.g = c.g;
         this.b = c.b;
+
+        this.h = c.h;
+        this.s = c.s;
+        this.l = c.l;
     }
 
     /**
@@ -28,8 +36,7 @@ public ScratchColor(ScratchColor c) {
      * @return hue value [0...255]
      */
     public float getHSB() {
-        float[] hsb = ScratchColor.RGBtoHSB(this.r, this.b, this.g);
-        return hsb[0] * 255;
+        return this.h;
     }
 
     /**
@@ -38,11 +45,7 @@ public float getHSB() {
      * @param h A hue value [0...255]
      */
     public void setHSB(float h) {
-        h = (h % 255) / 255.0f;
-        float[] rgb = ScratchColor.HSBtoRGB(h, 1.0f, 1.0f);
-        this.r = rgb[0];
-        this.g = rgb[1];
-        this.b = rgb[2];
+        this.setHSB(h, this.s, this.l);
     }
 
     /**
@@ -53,9 +56,24 @@ public void setHSB(float h) {
      * @param l A luminosity value [0...255]
      */
     public void setHSB(float h, float s, float l) {
-        h = (h % 255) / 255.0f;
-        s = (s % 255) / 255.0f;
-        l = (l % 255) / 255.0f;
+        while (h > 255) {
+            h -= 255;
+        }
+        while (s > 255) {
+            s-= 255;
+        }
+        while (l > 255) {
+            l -= 255;
+        }
+
+        this.h = h;
+        this.s = s;
+        this.l = l;
+
+        h = h / 255.0f;
+        s = s / 255.0f;
+        l = l / 255.0f;
+
         float[] rgb = ScratchColor.HSBtoRGB(h, s, l);
         this.r = rgb[0];
         this.g = rgb[1];
@@ -73,6 +91,12 @@ public void setRGB(float r, float g, float b) {
         this.r = r;
         this.g = g;
         this.b = b;
+
+        float[] hsb = ScratchColor.RGBtoHSB(r, g, b);
+
+        this.h = hsb[0] * 255;
+        this.s = hsb[1] * 255;
+        this.l = hsb[2] * 255;
     }
 
     /**
@@ -81,7 +105,7 @@ public void setRGB(float r, float g, float b) {
      * @param h A hue value. Could be any positive or negative number.
      */
     public void changeColor(float h) {
-        float newH = (this.getHSB() + h) % 255;
+        float newH = this.getHSB() + h;
         this.setHSB(newH);
     }
 
@@ -144,4 +168,15 @@ public float getBlue() {
     }
 
 
+    public float getH() {
+        return h;
+    }
+
+    public float getS() {
+        return s;
+    }
+
+    public float getL() {
+        return l;
+    }
 }

src/eu/barkmin/processing/scratch/ScratchPen.java

@@ -63,7 +63,7 @@ public void changeColor(float c) {
     }
 
     public void changeColor(double c) {
-        this.changeColor((float) c);
+        this.color.changeColor((float) c);
     }
 
     /**

src/eu/barkmin/processing/scratch/ScratchSprite.java

@@ -274,6 +274,7 @@ public void setOnEdgeBounce(boolean b) {
     public void setPosition(int x, int y) {
         this.x = x;
         this.y = y;
+        this.getPen().setPosition(x, y);
     }
 
     /**