是否可以在处理中从java类中绘制一个矩形？

Question

我想要一个java对象，我将从main draw（）方法中调用object.draw（），这样每次处理草图绘制它时都会绘制java对象。

Answer 1

Yes.

You just need to pass the PApplet instance into the Java class, and then use that to do your drawing.

public class MyShape{
   PApplet papplet;

   public MyShape(PApplet papplet){
      this.papplet = papplet;
   }

   public void draw(){
      papplet.ellipse(50, 50, 25, 25);
   }
}

And then in your sketch, you would use the this keyword to pass the sketch into your object:

MyShape myShape;

void setup(){
   myShape = new myShape(this);
}

void draw(){
   myShape.draw();
}

More info can be found in the reference .