CODEWITHSUNDEEP
javascript
Sunwoo Yang
Sunwoo Yang

Reputation: 1243

this.image.width / number yields 0

I'm trying to calculate the width of a sprite using the image width, but the number always comes out as 0, why is that?

function SpriteSheet(image, numFramesX, numFramesY, totalFrames) {
    this.image = image;
    this.numFramesX = numFramesX;
    this.numFramesY = numFramesY;
    this.totalFrames = totalFrames;

    this.spriteWidth = this.image.width / this.numFramesX;
    this.spriteHeight = this.image.height / this.numFramesY;
}

image.onload = function() {
console.log('Image has been loaded');
}
image.src = 'dance.png';
spritesheet = new SpriteSheet(image, 8, 10, 80);

spritesheet.spriteWidth and spritesheet.spriteHeight always yields 0. I cornered the problem to 'this.image.width' since it works if I put in the width of the image manually.

this.spriteWidth = 880 / this.numFramesX;

instead of

this.spriteWidth = this.image.width / this.numFramesX;

It also works if I calculate it using the object in the console:

spritesheet.image.width / spritesheet.numFramesX

yields 110

jsfiddle

Upvotes: 0

Views: 63

Answers (1)

kidwon
kidwon

Reputation: 4514

How about that?

window.onload = function () {
    console.log('Image has been loaded');
    image.src = 'dance.png';
    spritesheet = new SpriteSheet(image, 8, 10, 80);
}

Upvotes: 2

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