Problem with a very simple code

Programming Questions

eulanaz

Problem with a very simple code

in Programming Questions • 7 months ago

Hello,

I'm a very newbie with Processing and I have a problem that I don't understand.

I will write a simple program with a specified background and a Polygon positioned in the correct coordinates. This Polygon have a dimension at start and in five steps must redimensioned (zoom out).

The problem is that the drawPolygon() method called by draw() method, draw everything he found without consider the i variable. So i can't simulate a zoom out (i take the way where i draw 5 different polygon, when the first is the biggest).

How can I resolve this problem?

I'm sorry for the stupid question and probably a poor English.

If you have more advice, do not hesitate.

Thank you.

Good Evening

My code is:

PImage bg;
int startTime;
int totalTime=5000;
int i=1;
public void setup() {
size(900, 557);
bg = loadImage("MyImage");
}
public void draw() {
background(bg);
strokeWeight(4);
stroke(1);
noFill();
System.out.println("i -> " + i);
if ((millis()-startTime) > totalTime) {
startTime = millis();
drawPolygon(i);
i++;
if(i==6)
i=1;
}
}
private void drawPolygon(int i) {
switch(i) {
case 1:
beginShape();
..............................
endShape();
case 2:
beginShape();
..................
endShape();
case 3:
beginShape();
........
case 4:
beginShape();
case 4:
beginShape();
......
endShape();
case 5:
beginShape();
.............
endShape();
}

Replies(6)

Chrisir

Re: Problem with a very simple code

7 months ago

in switch :

remember to end all
case elements with break;

each case element has its own break;

switch(i) {
case 1:
beginShape();
..............................
endShape();
break;
case 2:
beginShape();
..................
endShape();
break;
case 3:
etc. etc. ....................................................

see
http://www.processing.org/reference/switch.html

GoToLoop

Re: Problem with a very simple code

7 months ago

Just a small detail for complete sake:
Last case: doesn't really need a break;

Also, you can have a default: option which functions like an else from if.

eulanaz

Re: Problem with a very simple code

7 months ago

Ohhhh, sorry.

My mistake. Now the switch make his job. Very thanks for the fast answer.

Only another question, can I make an "animation" that show me the evolution of the shape? I mean, show like an animation the zoom out and not with differently shape that describe this evolution... Is possible?

Thanks,

Good Evening.

Eulanaz

Chrisir

Re: Problem with a very simple code

7 months ago

if you only zoom the same figure / shape / form you can use scale and

beginShape();
......
endShape();

and then change the scale / size slowly

http://www.processing.org/reference/scale_.html

eulanap

Re: Problem with a very simple code

7 months ago

Hello,

thanks for the answer. I try the function scale but the best way at the end is the first. So i leave this option.

I have another question. I resolve my code but i must to export in a mp4 file. With Processing program I choice Export like as Application for Linux, Windows, Mac OS.

This not work!!!

How can I create a video from my code?

Thanks a lot,

eulanap

Chrisir

Re: Problem with a very simple code

7 months ago

Export like as Application for Linux, Windows, Mac OS.

this gives you a stand alone running program that runs without the processing IDE - not what you want.

what you want for making a movie is saveFrame
http://processing.org/reference/saveFrame_.html

then you stitch the single images together to a movie with bmp2avi or a movie program