how to move the canvas?

General Discussion Other

lwbiuchsjk

in General Discussion • Other • 3 months ago

In my application, I want to move the canvas automatically and continuously.

I have a thought that I can translate, background(black), and then redraw the whole thing in the PApplet.

But I don not know how to redraw the whole thing !

I need help!

Thanks a lot

Replies(6)

Chrisir

Re: how to move the canvas?

3 months ago

hello!

float x, y;
float xadd=2;
void setup() {
size (600, 600);
}
void draw() {
background(0);
translate (x, y);
// all you want to paint comes here
stroke(255);
line (20, 20, 40, 40);
x+=xadd;
y+=.7;
if (x>width)
xadd=-1*abs(xadd);
}

lwbiuchsjk

Re: how to move the canvas?

3 months ago

Thanks! It does the things what I wanted !

But here is the question:

How can I repaint the whole things that already in the PApplet no mater whether I know what are they?

PhiLho

Re: how to move the canvas?

3 months ago

See get() and image(), perhaps.

lwbiuchsjk

Re: how to move the canvas?

3 months ago

I will have a try.

Thanks!

Chrisir

Re: how to move the canvas?

3 months ago

this is PhiLhos idea
you need to hit a key then the canvas starts to move

//
// pos of the moving canvas
float x, y;
// how the canvas moves:
float xadd=2;
float yadd=.77;
//
// has canvas started to move?
boolean moveCanvas=false;
// image of canvas
PImage img;
//
void setup() {
size (600, 600);
background(0);
} // func
//
void draw() {
if (moveCanvas) {
// move canvas
background(0);
translate (x, y);
image(img, 0, 0);
x+=xadd;
y+=yadd;
if (x>width-100)
xadd=-1*abs(xadd);
if (y>width-100)
yadd=-1*abs(yadd);
if (x<-50)
xadd=abs(xadd);
if (y<-50)
yadd=abs(yadd);
}
else
{
// make canvas
background(0);
// all you want to paint comes here
stroke(255);
line (20, 20, 40, 40);
line (20, 220, 240, 40);
ellipse(100, 100, 90, 30);
text("hit a key to start", 40, 300);
}
} // func
//
void keyPressed() {
moveCanvas=true;
img=get(0, 0, width, height);
x=0;
y=0;
} // func
//

lwbiuchsjk

Re: how to move the canvas?

3 months ago

Cool !

Your idea open my mind a lot !

Thanks !

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