hi, guys.
I know this might look stupid, but I couldn't figure out a very simple (at least in lingo) operation on images.

I create new PImage objects, but then it doesn't allow me to perform any operation on them.

for example:
how can i draw a line on a PImage object?
I noticed that all the documentation I can find around, makes operations on the screen image.

what if I want to create my own stuff in a buffer and only when I have what I want project it using image(sourceImage,x,y)?

please, help me out with this.

besides...
is there any reference with examples and other?
I find the site reference a bit weak.
sorry for complains, but I'm a very bad guy



ciao.ubi

ps: I love what this software can do, and since director/lingo proves always slower and slower, I need to learn it to replace the old IDE
besides: flash sucks

hey, mark
u actually made my processing day!

I got to the point of using PGraphics, but I couldn't have anything work.
not even .background()

I was missing the damn defaults()

well...
I had to use PGraphics3 in order to have .line() work on an image object

but now a lot changed.
do you know if PGraphics2 and 3 simply extend the PGraphics class?
well...
probably I can go check myself the source, but i'm a very bad java programmer (I know nothing about it)

thanx for your GREAT help

ciao.ubi

ok...
more problems to come.

what I got so far is the ability to draw on an image object declaring it as a PGraphics3 object.

my little one is this


PGraphics3 bfr;
PImage extImg;
color blk=color(0,0,0);
void setup()
{
 size(200, 200);
 framerate(30);
 bfr=new PGraphics3(320,240,null);
 extImg=loadImage("test.gif");
 background(127,255,121);
 bfr.stroke(255);
 bfr.background(127,255,121);
 bfr.set(10,10,blk);
 bfr.set(100,10,blk);
 bfr.set(100,100,blk);
 bfr.set(10,100,blk);
}

void draw()
{
 int mx=mouseX;
 int my=mouseY;
 bfr.line(150,150,mx,my);
 image(extImg,0,0);
 line(0,0,mx,my);
 image(bfr,10,10);
}


and it doesn't allow for runtime [draw()] drawing on the object.
the only thing I can do is draw over it during setup.

hope somebody can sort this out

Try this!

I've commented out your first image() just for speed my end, and the copy needs to obviously contain the right size parameters, again width and height used for speed, but you'd change them to me.width etc;

Seems casting the P3 as a P does the trick

Code:

void draw()  
{  
  int mx=mouseX; 
  int my=mouseY; 
  bfr.line(150,150,mx,my); 
//  image(extImg,0,0); 
  line(0,0,mx,my); 
  
  PGraphics me= (PGraphics)bfr;

  copy(me,0,0,width,height,0,0,width,height);

} 
 

This takes care of the problem  for both of us, I hope!

hey, mark.
sorry for the delay.
I was on a deadline and had a pretty hard time to even check emails.
last night (tired as hell) I checked the board and found your post.
immediately gave it a try.

no big change.

here's what I have so far

PGraphics3 bfr;
PImage extImg;
color blk=color(0,0,0);
void setup()
{
 size(200, 200);
 framerate(30);
 bfr=new PGraphics3(320,240,null);
 extImg=loadImage("test.gif");
 background(127,255,121);
 stroke(255,0,0,100);
 bfr.stroke(255,0,0,255);
 bfr.background(127,255,121);
 bfr.set(10,10,blk);
 bfr.set(100,10,blk);
 bfr.set(100,100,blk);
 bfr.set(10,100,blk);
 //bfr.image(extImg,0,0);
}

void draw()
{
 int mx=mouseX;
 int my=mouseY;
 bfr.line(200,200,mx,my);
 //copy(bfr,0,0,width,height,0,0,width,height);
 line(0,0,mx,my);
}

check the commented lines, please.

if we uncomment the first one (in the setup) we can have a graphic on bfr.
but then, when executing a line over it

bfr.line(200,200,mx,my);

we get a weird result.
if you try staying still on the image, then you realize that the line is drawn cycle by cycle.
this means that we have a low opacity (alpha) on the stroke.
setting a different stroke, doesn't change much.
if we uncomment the second commented line

copy(bfr,0,0,width,height,0,0,width,height);

then we can't see any result, cause the line is drawn with low opacity, but at the next cycle it's covered by the bfr base image again.

this means that fixes are needed on the stroke method over PGraphics3 objects.

by the way...
thanx a lot for you efforts, mark.

:)