Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Topics/GUI/Handles/Handles.pde

@@ -0,0 +1,127 @@
+/**
+ * Handles. 
+ * 
+ * Click and drag the white boxes to change their position. 
+ */
+ 
+Handle[] handles;
+
+void setup() {
+  size(640, 360);
+  int num = height/15;
+  handles = new Handle[num];
+  int hsize = 10;
+  for (int i = 0; i < handles.length; i++) {
+    handles[i] = new Handle(width/2, 10+i*15, 50-hsize/2, 10, handles);
+  }
+}
+
+void draw() {
+  background(153);
+  
+  for (int i = 0; i < handles.length; i++) {
+    handles[i].update();
+    handles[i].display();
+  }
+  
+  fill(0);
+  rect(0, 0, width/2, height);
+}
+
+void mouseReleased()  {
+  for (int i = 0; i < handles.length; i++) {
+    handles[i].releaseEvent();
+  }
+}
+
+class Handle {
+  
+  int x, y;
+  int boxx, boxy;
+  int stretch;
+  int size;
+  boolean over;
+  boolean press;
+  boolean locked = false;
+  boolean otherslocked = false;
+  Handle[] others;
+  
+  Handle(int ix, int iy, int il, int is, Handle[] o) {
+    x = ix;
+    y = iy;
+    stretch = il;
+    size = is;
+    boxx = x+stretch - size/2;
+    boxy = y - size/2;
+    others = o;
+  }
+  
+  void update() {
+    boxx = x+stretch;
+    boxy = y - size/2;
+    
+    for (int i=0; i<others.length; i++) {
+      if (others[i].locked == true) {
+        otherslocked = true;
+        break;
+      } else {
+        otherslocked = false;
+      }  
+    }
+    
+    if (otherslocked == false) {
+      overEvent();
+      pressEvent();
+    }
+    
+    if (press) {
+      stretch = lock(mouseX-width/2-size/2, 0, width/2-size-1);
+    }
+  }
+  
+  void overEvent() {
+    if (overRect(boxx, boxy, size, size)) {
+      over = true;
+    } else {
+      over = false;
+    }
+  }
+  
+  void pressEvent() {
+    if (over && mousePressed || locked) {
+      press = true;
+      locked = true;
+    } else {
+      press = false;
+    }
+  }
+  
+  void releaseEvent() {
+    locked = false;
+  }
+  
+  void display() {
+    line(x, y, x+stretch, y);
+    fill(255);
+    stroke(0);
+    rect(boxx, boxy, size, size);
+    if (over || press) {
+      line(boxx, boxy, boxx+size, boxy+size);
+      line(boxx, boxy+size, boxx+size, boxy);
+    }
+
+  }
+}
+
+boolean overRect(int x, int y, int width, int height) {
+  if (mouseX >= x && mouseX <= x+width && 
+      mouseY >= y && mouseY <= y+height) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+int lock(int val, int minv, int maxv) { 
+  return  min(max(val, minv), maxv); 
+}