Comments on: Exercise 9-7: Snake as object

By: Maggie

Maggie — Tue, 18 Oct 2011 12:38:00 +0000

Oh nevermind! I just realized there’s two different tabs

By: Maggie

Maggie — Tue, 18 Oct 2011 12:20:00 +0000

could you please provide the full example?
thanks!

By: Johan Hess

Johan Hess — Tue, 16 Nov 2010 06:36:02 +0000

ok I have just read chapter 10, where i found the solution: ellipse(points[i].x, points[i].y,i,i)

thank you regardless

By: Johan Hess

Johan Hess — Tue, 16 Nov 2010 04:54:11 +0000

In the advanced problem how do you draw the ‘ellipses’ with the new array of Point objects?

The ‘xpos’ and ‘ypos’ arrays can be directly used as arguments for the ellipse: ellipse(xpos[i],ypos[i],i,i),
but with the Point object i cant see how this is possible, as ellipse obviously dosnt work with: ellipse(points[i],points[i],i,i).

do you need to decipher the x and y value from the points object so that you are able to use them seperately within the ellipse object, and if so, how is that done?
or is some larger change needed to make it work?

By: Daniel Shiffman

Daniel Shiffman — Wed, 10 Nov 2010 16:13:09 +0000

First you need a simple Point class, which could look like so:

class Point {
  float x;
  float y;
 
   Point(float x_, float y_) {
     x = x_;
     y = y_;
  }
}

Once you have this then your Snake class only needs one array of "Point" objects, rather than two separate x and y arrays.

 class Snake {
  // x and y positions
  Point[] points;

  // etc.

By: marisaurus

marisaurus — Tue, 09 Nov 2010 13:07:58 +0000

In the book, you have an addition to this exercise, concerning the use of a Pt class that would be called into the Snake class. Is it possible to post how to do this?

thanks.