Scratch

MathWizz wrote:

Code:

function Vector2(x, y)
{
    this.x = x || 0;
    this.y = y || 0;
}

Don't leave out the lesser-known numbers:

new Vector2(NaN, NaN)
new Vector2(-0, -0)

(I have actually needed the former to do something before)

function Vector2(x, y) {
    this.x = x === undefined ? x : 0;
    this.y = y === undefined ? y : 0;
}

or maybe:

function Vector2(x, y) {
    this.x = arguments.length > 0 ? x : 0;
    this.y = arguments.length > 1 ? y : 0;
}

Anyways, that's not a great example of default arguments because I've never needed* to pass less than 2 arguments to a Vector2 constructor, but it's useful to know how to implement them.

* Except morphic.js, which uses

SubClass.prototype = new SuperClass();

when it should use

SubClass.prototype = Object.create(SuperClass.prototype);

because new is just an Object.create call and a constructor call on that object (which you don't want to happen).

nXIII wrote:

Oh... be careful with forms that have fewer pixels than they should:

http://oi43.tinypic.com/s2tv0h.jpg

(that's the penTrails form)

Yikes. Umm. How to avoid?

  You make me jealous.

@nXIII Ok. So now I have an array of bytes with one byte for every pixel of the image, but every value except for every 4th one is 0. Is this supposed to happen?

I have a very small image with these bits:

860094464
860094464
287440896
287440896

I decode them into:

0: 209984
1: 0
2: 0
3: 0
4: 209984
5: 0
6: 0
7: 0
8: 70176
9: 0
10: 0
11: 0
12: 70176
13: 0
14: 0
15: 0

EDIT: I just realized... Is it run length encoded (or similar to that)?

EDIT: I ran the Java code and it returns the index of the colors for every pixel. Time to debug.

EDIT: LAST EDIT! I found the bugs but and I am sure it should work, but but I'm STILL not getting the right output. I think it may be caused by rounding er... OH WAIT! You said to split the 32 bits words to avoid ROUNDING ERRORS didn't you. 

EDIT: Wowfail. So much trouble because the Java code rounded when it divided integer and JavaScript did not. 

ProgrammingFreak wrote:

Okay, so I've done the code, but I can't get it to work with morphic. :l

Umm... Put it under the Morph's drawNew method?

EDIT: Scratch (no pun intended) that. It would probably go under drawOn instead.

Last edited by MathWizz (2011-12-15 14:45:34)

@GP1 *waits for midnightleopard to get on*

I've kinda had a monopoly on the code, haven't I? 

Are we using jQuery for this? I think it would be helpful.

So, could you guys fill me in on how this works and what I have to work on, and maybe the documentation of reading scratch projects?

WOOOOO!!! Images with depths less than or equal to 8 work as of now. 

http://jsscratch.co.cc/player/player.ht … mg+test.sb

@nXIII 

Is the "Browser Unsupported" bit just a hint at "We're not done yet, so buzz off", or am I missing a plugin?

This is coming along brilliantly! I'm really impressed. 

MathWizz wrote:

WOOOOO!!! Images with depths less than or equal to 8 work as of now. 

http://jsscratch.co.cc/player/player.ht … mg+test.sb

Yesss! 

MathWizz wrote:

WOOOOO!!! Images with depths less than or equal to 8 work as of now. 

http://jsscratch.co.cc/player/player.ht … mg+test.sb

You are officially amazing.