2. PGraphics off;
3. 
   
4. void setup()
5. {
6.    size( 640, 480 , P3D); 
7.    off = createGraphics( 500, 500, P3D );
8. }
9. 
   
10. void draw()
11. {   
12.    background( 0 );
13. 
    
14.    off.beginDraw();
15.    off.background( 0 );
16.    off.fill( 255 );
17.    off.rect( 0, 0, off.width, off.height );
18.    off.endDraw();
19.    
20.    
21.    PImage offCopy = off.get();
22.   
23. // rendering using beginShape gives a black screen
24.    beginShape();
25.      texture( offCopy );
26.      vertex( 0, 0 );
27.      vertex( width, 0 );
28.      vertex( width, height );
29.      vertex( 0, height );
30.    endShape( CLOSE );  
31.   
32.  // rendering with image() gives white screen  
33.  // uncomment out this line to see the white rect
34.  // image( off, 0,0, width, height );
35. }  

I would expect the beginShape to render a white screen as the rect should be covering the entire area. It is only rendering the black background and I can't get anything to render inside the visible area. If I render using image()

I get a white screen as you would expect.


I thought image would be doing something similar to the beginSHape/ endSHape block? I really don't know where I am going wrong and would love some insight.

Stephen 

Hey,

I have 8 co-ordinates that I want to draw a rect around:

x1,y1,                   x2,y2

x3,y3                   x4,y4

i pass x1,y1 into rect:

rect ( x1,y1, width, height )

I need to work out the width and height from the other co-ordinates and I have tried:

width = x2 - x1;
height = y1 - y3;

this doesn't seem to work but I'm not sure what the formula to work this out is...

If anyone has any Ideas I would really appreciate it as I'm stumped!

  quadcoords = new XMLElement(this, "keystone.xml");

  int numXMLelements = quadcoords.getChildCount();

  for ( int i = 0; i < numXMLelements; i++) {

    XMLElement point = quadcoords.getChild(i);

    

   PVector[] posit = new PVector[point.getInt("i")];

//   

posit[i] = new PVector();

//

     posit.x =  point.getFloat("x");

     posit.y =  point.getFloat("y");

  }

This doesn't work because i think its illegal to make a PVector Array in this way but i'm stuck on how to do this.

here is a sample XML file:

<keystone>

  <surface res="20" x="24.0" y="26.0" w="400" h="400">

    <point i="0" x="-29.0" y="8.0" u="0.0" v="0.0"/>

    <point i="20" x="74.0" y="-1.0" u="400.0" v="0.0"/>

    <point i="420" x="-4.0" y="448.0" u="0.0" v="400.0"/>

    <point i="440" x="86.0" y="369.0" u="400.0" v="400.0"/>

  </surface>

  <surface res="20" x="281.0" y="178.0" w="400" h="400">

    <point i="0" x="162.0" y="155.0" u="0.0" v="0.0"/>

    <point i="20" x="231.0" y="156.0" u="400.0" v="0.0"/>

    <point i="420" x="159.0" y="222.0" u="0.0" v="400.0"/>

    <point i="440" x="233.0" y="225.0" u="400.0" v="400.0"/>

  </surface>

  <surface res="20" x="282.0" y="-45.0" w="400" h="400">

    <point i="0" x="154.0" y="25.0" u="0.0" v="0.0"/>

    <point i="20" x="369.0" y="20.0" u="400.0" v="0.0"/>

    <point i="420" x="168.0" y="285.0" u="0.0" v="400.0"/>

    <point i="440" x="389.0" y="278.0" u="400.0" v="400.0"/>

  </surface>

  <surface res="20" x="338.0" y="322.0" w="400" h="400">

    <point i="0" x="14.0" y="7.0" u="0.0" v="0.0"/>

    <point i="20" x="99.0" y="6.0" u="400.0" v="0.0"/>

    <point i="420" x="20.0" y="76.0" u="0.0" v="400.0"/>

    <point i="440" x="96.0" y="84.0" u="400.0" v="400.0"/>

  </surface>

</keystone>

If anyone knows how to properly extract this data I would really appreciate your help and can offer a reward!.

all the best,

Stephen

I am capturing photo's from PImage using get() like:

img.get(width/2,height/2,50,30);

but the segment of the image is at an angle I have tried rotating the get() but this doesn't change the co-ordinates and I still get an image at the same angle. Is there any way to rotate the get() ? this is probably a stupid question but i would like to find out if this is possible. I am taking the resulting images for textures and uv mapping so I will have to use rotation at that point i think if i can't get a rectangular segment at an angle. 

if any one can shed some light that would be great.

magic monz vj www.vimeo.com/magicmonz

I've been trying to make a grid using the line() as aposed to using rect() which i see mostly:

the thing which is baffling me is why this code doesn't work at all... it just gives a blank screen :

void setup(){

size(400,400);

smooth();

}

void draw(){

for(int i = 4; i > height; i++){

line( i, 0, i, height);

}

}

this obviously only gives the vertical lines... it looks like it should work, i can't figure out why it doesn't. I'm probably missing something obvious but i just can't see it. 

if someone can shed some light on this I would appreciate it.

I'm trying to port code from here:  http://paulbourke.net/fractals/

it doesn't work very well (if at all) with floats it really doesn't look right.