Hey Guys,

I'm trying to optimize my program's excessive amount redraw. I'm wanting to derive a technique that checks to see if the state of things has changed visually and if they have, redraw, update whatever. If they haven't then I want to put these items into some sort of image buffer. so that there is only ever one image being redrawn of on the canvas (in the main draw loop) when things are idol.

Hope this makes sense. Here is a small section of the code from what I am working on. It would be awesome if someone could edit this code and show me an example of how to implement this. Please note I am not looking to use the loop() and noLoop() functions as this means that the rollover functions cant not update when the entire program is at a halt.

Thanks in advance!

1.  BezierSection bezSection1;
   
   
   void setup() {
     size(600, 400);
     noStroke();
     smooth();
     bezSection1 = new BezierSection(1, new PVector(60, 300), new PVector(300, 300), new PVector( 200,90), new PVector(440,90));
   }
   
   void draw() {
     background(41);
    bezSection1.display(mouseX);
   }
   
   // release any point attached to the mouse
   void mouseReleased () {
     bezSection1.release();
   }
   
   // for dragg'n dem points
   void mousePressed () {
     bezSection1.press();
   }
   
   
   class BezierSection {
   
   
   
     // variables for control and anchor points.
     int pts = 4;
     int ptSize = 8;
     float[]x = new float[4];
     float[]y = new float[4];
     boolean[]isDragSafe = new boolean[4];
     float[]xOld = new float[4];
     float[]yOld = new float[4];
     float[]xOffset = new float[4];
     float[]yOffset = new float[4];
     boolean[]over = new boolean[4];
     boolean hasChanged =false;
   
     float stuff;
   
   
   
   
     BezierSection(float t, PVector A, PVector B, PVector C, PVector D) {
       // fill coordinate arrays
       xOld[0] = x[0] = A.x;
       xOld[1] = x[1] = B.x;
       xOld[2] = x[2] = C.x;
       xOld[3] = x[3] = D.x;
       yOld[0] = y[0] = A.y;
       yOld[1] = y[1] = B.y;
       yOld[2] = y[2] = C.y;
       yOld[3] = y[3] = D.y;
   
       //initialize dragging flags to false
       for (int i =0; i< pts; i++) {
         isDragSafe[i] = false;
       }
     }
   
   
     void display(float timeSliderPos) {
   
      
       // test print function
       ///////////////////////////////////println(getCVPositions());
   
       //draw curves and control handles
       strokeWeight(2);
       stroke(138, 216, 20);
       noFill();
       bezier (x[0], y[0], x[1], y[1], x[2], y[2], x[3], y[3]);
       // draw bezier handles
       strokeWeight(2);
       stroke(107);
       line(x[1], y[1], x[0], y[0]);
       line(x[3], y[3], x[2], y[2]);
       // draw anchor/control points
       noStroke();
       fill(0);
       for (int i =0; i< pts; i++) {
         if (i ==0 || i==3) {
   
           fill(0);
           ellipse(x[i], y[i], ptSize+4, ptSize+4);
         } 
         else {
           fill(231, 163, 27);
           rectMode(CENTER);
           rect(x[i], y[i], ptSize, ptSize);
         }
       }
   
       over(); //currently just used as a rollover hint for the CVs
   
   
       // start dragging if flag true
       if (isDragSafe[0]&&isDragSafe[1]) {// if it's anchor 1 and it's handle then move them both and add and offset to the handle
         //  getOffset();
         x[0] = mouseX;
         y[0] = mouseY ;
         x[1] = mouseX - xOffset[1];
         y[1] = mouseY - yOffset[1];
         xOld[1] = x[1];
         yOld[1] = y[1];
       }
       if (isDragSafe[1]&&!isDragSafe[0]) {
         x[1] = mouseX;
         xOld[1] = x[1];
         y[1] = mouseY;
         yOld[1] = y[1];
       }
       if (isDragSafe[2]&&isDragSafe[3]) {// if it's anchor 2 and it's handle then move them both and add and offset to the handle
         x[3] = mouseX;
         y[3] = mouseY;
         x[2] = mouseX - xOffset[2];
         y[2] = mouseY - yOffset[2];
         xOld[2] = x[2];
         yOld[2] = y[2];
       }
       if (isDragSafe[2]&&!isDragSafe[3]) {
         x[2] = mouseX;
         xOld[2] = x[2];
         y[2] = mouseY;
         yOld[2] = y[2];
       }
       fill(231, 163, 27);
      
       // If statement to be called and used in conjunction with image buffer (once I learn how)
       if (xOld[0] == x[0]&&
           xOld[1] == x[1]&&
           xOld[2] == x[2]&&
           xOld[3] == x[3]&&
           yOld[0] == y[0]&&
           yOld[1] == y[1]&&
           yOld[2] == y[2]&&
           yOld[3] == y[3]){
       println("hasn't changed");
       hasChanged = false;
       }
       else {
       println("has changed!!!");
       xOld[0] = x[0];
       xOld[1] = x[1];
       xOld[2] = x[2];
       xOld[3] = x[3];
       yOld[0] = y[0];
       yOld[1] = y[1];
       yOld[2] = y[2];
       yOld[3] = y[3];
       hasChanged = true;
       }
     }
   
   
     void press() {
       for (int i =0; i< pts; i++) {
         if (mouseX>=x[i]-ptSize-5 && mouseX<=x[i]+ptSize+5 && 
           mouseY>=y[i]-ptSize-5 && mouseY<=y[i]+ptSize+5) {
           if (i==0) {
             isDragSafe[i] = true;
             isDragSafe[i+1] = true;
             yOffset[1] = (y[0] - yOld[1]);  //Work out the offset between the anchor and the handle
             xOffset[1] = (x[0] - xOld[1]);
           }
           if (i==3) {
             isDragSafe[i] = true;
             isDragSafe[i-1] = true;
             yOffset[2] = (y[3] - yOld[2]);  //Work out the offset between the anchor and the handle
             xOffset[2] = (x[3] - xOld[2]);
           }
           else {
             isDragSafe[i] = true;
           }
         }
       }
     }
   
     void over() { // this is all just for rollover feedback
       for (int i =0; i< pts; i++) {
         if (mouseX>=x[i]-ptSize-5 && mouseX<=x[i]+ptSize+5 && 
           mouseY>=y[i]-ptSize-5 && mouseY<=y[i]+ptSize+5) {
           if (i==0 && isDragSafe[1] == false && isDragSafe[2] == false && isDragSafe[3] == false ) {
             fill(0);
             noStroke();
             ellipse(x[i], y[i], 15, 15);
           }
           if (i==1 && isDragSafe[2] == false && isDragSafe[3] == false ) {
             fill(231, 163, 27);
             noStroke();
             rect(x[i], y[i], 12, 12);
           }
           if (i==2 && isDragSafe[0] == false && isDragSafe[1] == false) {
             fill(231, 163, 27);
             noStroke();
             rect(x[i], y[i], 12, 12);
           }
           if (i==3 && isDragSafe[0] == false&& isDragSafe[1] == false && isDragSafe[2] == false) {
             fill(0);
             noStroke();
             ellipse(x[i], y[i], 15, 15);
           }
         }
       }
     }
   
     void release() {
       for (int i =0; i< pts; i++) {
         isDragSafe[i] = false;
       }
     }
   
     void move() {
       cursor(ARROW);   
       for (int i =0; i< pts; i++) {
         if (mouseX>=x[i]-15 && mouseX<=x[i]+15 && mouseY>=y[i]-15 && mouseY<=y[i]+15) {
           cursor(HAND);
         }
       }
     }
   
     PVector[] getCVPositions() {
       PVector[] vals = {
         new PVector(x[0], y[0]), new PVector(x[1], y[1]), new PVector(x[2], y[2]), new PVector(x[3], y[3])
         };
         return vals;
     }
   
     boolean getBezLockedState() {
       if (isDragSafe[0] || isDragSafe[1]||isDragSafe[2]||isDragSafe[3]) {
         return true;
       }
       return false;
     }
    
   }
   
   
   
   
   
   
   
   

Hi all,

I'm writing my own text field and was wondering how I might go supporting copy and paste. I want to be able to copy and paste from one field to another and also from outside of the app. Like copying from a text editor to the processing applet.

Anyone out there familiar with this problem?

Thanks,

Dan.

Hi,

I'm having some trouble with the cursor() function. If you run the code below you will see that the cursor only turns into a hand when rolling over button2. button1 changes colour when you roll over it but the cursor does not change to a hand.

Can anyone tell me if I am doing this wrong? The example is straight out the Processing Hand Book. I just added Cursor (Hand); to the void display() block.

Thanks in Advance,

Dan.

1. Button button1, button2;
   
   void setup() {
     size(200, 200);
     // Inputs: x, y, size,
     // base color, over color, press color
     button1 = new Button(25, 25, 20,
     color(204), color(255), color(0));
     button2 = new Button(25, 80, 20,
     color(204), color(255), color(0));
   }
   
   void draw() {
     background(204);
     stroke(255);
     button1.update();
     button1.display();
     button2.update();
     button2.display();
   }
   
   void mousePressed() {
     button1.press();
       button2.press();
   }
   
   void mouseReleased() {
     button1.release();
      button2.release();
   }
   class Button {
     int x, y; // The x- and y-coordinates
     int size; // Dimension (width and height)
     color baseGray; // Default gray value
     color overGray; // Value when mouse is over the button
     color pressGray; // Value when mouse is over and pressed
     boolean over = false; // True when the mouse is over
     boolean pressed = false; // True when the mouse is over and pressed
   
     Button(int xp, int yp, int s, color b, color o, color p) {
       x = xp;
       y = yp;
       size = s;
       baseGray = b;
       overGray = o;
       pressGray = p;
     }
    
     // Updates the over field every frame
     void update() {
       if ((mouseX >= x) && (mouseX <= x + size) &&
           (mouseY >= y) && (mouseY <= y + size)) {
         over = true;
       } else {
         over = false;
       }
     }
   
     boolean press() {
       if (over == true) {
         pressed = true;
         return true;
       } else {
         return false;
       }
     }
   
     void release() {
       pressed = false; // Set to false when the mouse is released
     }
   
     void display() {
       if (pressed == true) {
         fill(pressGray);
       } else if (over == true) {
         fill(overGray);
         cursor(HAND);
       } else {
         fill(baseGray);
         cursor(ARROW);
       }
       stroke(255);
       rect(x, y, size, size);
     }
   }