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Index › Programming Questions & Help › Syntax Questions › How do I make a static class
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How do I make a static class? (Read 1855 times)
Phattee
How do I make a static class?
Jun 6th, 2010, 8:39pm  
Hi, I'm trying to make a static class that contains code for drawing shapes but I can't quite figure out how to get a static class working. Here's what I have in the main tab:

Quote:
void setup() {
  smooth();
  noStroke();
}

void draw() {
  background(0);
  fill(255);
  Shapes.pentagon(10, 20, 10);
}



and here's the attempted static class:

Quote:
static class Shapes{

  static void pentagon(int x, int y, float radius){
    beginShape();
    for (int deg = 0; deg < 360; deg += 72) {
      float xPos = -sin(radians(deg)) * radius;
      float yPos = -cos(radians(deg)) * radius;  
      vertex(x + xPos , y + yPos);
    }
    endShape(CLOSE);
  }
}



I think I'm just tired. I'll give it another shot tomorrah
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koogy
Re: How do I make a static class?
Reply #1 - Jun 7th, 2010, 12:21am  
you will have trouble because your sketch is actually an inner class - it gets wrapped during the processing, er, pre-processing

(export a minimal app and look at the generated java file)

public class ProjectName extends PApplet {

public void setup() {
...
}

public void draw() {
...
}

 class YourStaticClass {
 }

}
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PhiLho 
Re: How do I make a static class?
Reply #2 - Jun 7th, 2010, 1:18am  
Actually, you don't really need static classes, you can just put the static variables and static functions at the top level (ie., somehow, at "global" level, but actually these are fields and methods of the class created from your sketch).

Technically, you can make static classes by putting them in .java files, but then you loose easy access to PApplet functions (like beginShape or sin).
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WWW  
Phattee
Re: How do I make a static class?
Reply #3 - Jun 7th, 2010, 10:40am  
Ah ok cool thank you. I'll do this instead:

Quote:
float x, y;
float radius;
int shapeID;
Shape shapeX;

void setup() {
  smooth();
  noStroke();
  x = width/2;
  y = height/2;
  radius = 10;
  shapeID = 1;
}

void draw() {
  background(0);
  fill(255);
  shapeX = new Shape(x, y, radius, shapeID);
  shapeX.drawShape();
}




Quote:
class Shape{
  float x, y;
  float radius;
  int shapeID;

  Shape(float x, float y, float radius, int shapeID){
    this.x = x;
    this.y = y;
    this.radius = radius;
    this.shapeID = shapeID;
  }

  void drawShape() {
    if (shapeID == 1) {
      beginShape();
      for (int deg = 0; deg < 360; deg += 72) {
        float xPos = -sin(radians(deg)) * radius;
        float yPos = -cos(radians(deg)) * radius;  
        vertex(x + xPos , y + yPos);
      }
      endShape(CLOSE);
    }
  }
}
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