Hi Gametheory,

You need a two-dimensional array to keep point coordinates, then for each mouse click add mouseX and mouseY of the click (using mousePressed) as a new point coordinates. In the draw() part of your sketch, redraw this array each frame with point() and line().

I could give you code but you want to learn by yourself, don't you ?

If you get stuck or lose patience, just ask...

further to my problem whereby i had to plot points on d screen and join them by a straight line segment which stops once a key is pressed that is d drawing ends this is what i managed to come up with:

boolean drawVertex = false;

void setup(){
 
  size(450,450);
 
  background(25,88,126);
  strokeWeight(30);
 
int [] x = {50, 67, 89, 124, 345};

int [] y = { 98, 56,45,125, 56};

beginShape();

for(int i = 0; i < x.length; i++){
 
  point (x[i], y[i]);
}

beginShape();

for(int i = 0; i < x.length; i++){
 
  vertex (x[i], y[i]);
}


  void keyPressed() {
 
  if ((key == 'A')){
    endShape(CLOSE) = true;
}

}
}

whereby im missing the stage whereby the vertex actaully passes from one point to another..........among the errors is dat d compiler points out that void keyPressed is an unexpected token.....

thnks

ps i just tried this too...............
boolean drawVertex = false;

void setup(){
 
  size(500,500);
 
  strokeWeight (18);
 
}

void draw(){
 
  background(45,200,88);
 
  if (drawVertex == true) {
    beginShape ();
    point (25,450);
    point (45,156);
    endShape();
  }
}

void keyPressed() {
 
  if ((key == 'A')) {
   
    drawVertex = true;
  }
}

void keyReleased(){
 
  drawVertex = false;
 
}
but i need to see the line being plotted.........maybe frameRate() ??

thnks

Dernière modification par gametheory (2009-02-10 19:40:45)

thanks a lot but i need to see dpoints plotting from one point to another as in slow motion......maybe i should use threading???

thanks again

hi itsme again guys.....i have manged to write a processing program whereby i load a text file called positions and plot the corresponding points. However in order to draw these points and calling the draw method, the program doesn't respond....this is my code so far....any help gretaly appreciated

thanks



PrintWriter output;

void setup()
{
   
   size(1024,768);
   
   strokeWeight(7);
   
   output = createWriter("positions.txt");
}
   
   void draw()
   {
     
     if (mousePressed)
     {
       
       output.println(mouseX + "\t" + mouseY + "\n");
       point(20,120);
       point(5,180);
       point(16,200);
       point(100,60);
       point(120,40);
       point(70,20);
       
     }
     
     if (keyPressed)
     {output.flush();
     output.close();
     }
   }

that is as regards the plotting of points.....if i need to use draw these points should i use a for loop in the draw method?

plus how will draw identify these points? shouldi store them in an array 2 dimensional array first?

thnks

many thanks....i will look in it

regards

its me again.....i must design a 3d teapot....and i would like to design curves....would it be useful to use curveVertex or curveBezier??

thnks

gametheory a écrit:

its me again.....i must design a 3d teapot....and i would like to design curves....would it be useful to use curveVertex or curveBezier??

bezierVertex will give you more control over the curves drawn, with control points, but it's harder to use. curveVertex only need points coordinates and the curves will be drawn passing by these points.

gametheory a écrit:

if i use vertex for a 3d structure must i use three parameters one of which would be negative??

You'll need points within a 3d space, with 3 coordinates, one for each axis : x, y ,z . Those coordinates could be positive or negative. You should take a look at processing 3D examples : http://processing.org/learning/3d/