java/examples/Topics/GUI/Handles/applet/Handles.java

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+import processing.core.*; 
+
+import java.applet.*; 
+import java.awt.*; 
+import java.awt.image.*; 
+import java.awt.event.*; 
+import java.io.*; 
+import java.net.*; 
+import java.text.*; 
+import java.util.*; 
+import java.util.zip.*; 
+import java.util.regex.*; 
+
+public class Handles extends PApplet {
+
+/**
+ * Handles. 
+ * 
+ * Click and drag the white boxes to change their position. 
+ */
+ 
+Handle[] handles;
+int num;
+
+public void setup()
+{
+  size(200, 200);
+  num = height/15;
+  handles = new Handle[num];
+  int hsize = 10;
+  for(int i=0; i<num; i++) {
+    handles[i] = new Handle(width/2, 10+i*15, 50-hsize/2, 10, handles);
+  }
+}
+
+public void draw()
+{
+  background(153);
+  
+  for(int i=0; i<num; i++) {
+    handles[i].update();
+    handles[i].display();
+  }
+  
+  fill(0);
+  rect(0, 0, width/2, height);
+}
+
+public void mouseReleased() 
+{
+  for(int i=0; i<num; i++) {
+    handles[i].release();
+  }
+}
+
+class Handle
+{
+  int x, y;
+  int boxx, boxy;
+  int length;
+  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;
+    length = il;
+    size = is;
+    boxx = x+length - size/2;
+    boxy = y - size/2;
+    others = o;
+  }
+  
+  public void update() 
+  {
+    boxx = x+length;
+    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) {
+      over();
+      press();
+    }
+    
+    if(press) {
+      length = lock(mouseX-width/2-size/2, 0, width/2-size-1);
+    }
+  }
+  
+  public void over()
+  {
+    if(overRect(boxx, boxy, size, size)) {
+      over = true;
+    } else {
+      over = false;
+    }
+  }
+  
+  public void press()
+  {
+    if(over && mousePressed || locked) {
+      press = true;
+      locked = true;
+    } else {
+      press = false;
+    }
+  }
+  
+  public void release()
+  {
+    locked = false;
+  }
+  
+  public void display() 
+  {
+    line(x, y, x+length, 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);
+    }
+
+  }
+}
+
+public 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;
+  }
+}
+
+public int lock(int val, int minv, int maxv) 
+{ 
+  return  min(max(val, minv), maxv); 
+} 
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "Handles" });
+  }
+}