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Question of melonjs scale method


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Hi, I have a beginner's question about melonjs.
 
If I run '<any sprite object>.scale(2);', then the sprite will move a little to the upper left on the screen, and the sprite's appearance will be about four times as large.
The anchorPoint of the sprite is (0.5,0.5)(=default), so I think the sprite can't move, it just doubles the size of the sprite, but what's wrong with my code?
 
My environment is melonjs 8.0.1, browser is chrome, OS is macOS High sierra.
 
Thank you.
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  • 1 month later...

Thank you for your replying.

My code is below.

This is  on a me.Sprite, not for/in an Entity.

 

<play.js>

StretchingSprite = me.Sprite.extend({
    init : function(sx, sy, sc) {
        this._super(me.Sprite, 'init', [sx*chrX+chrX/2, sy*chrY+chrY/2, {image:chr[sc]}]);
        this.tm = 1;
        this.itv = 0;
    },
    update : function(dt) {
        this.itv += dt;
        if (this.itv < 100) {
            return true;
        }
        this.itv = 0;
        this.tm -= 0.2;
        if (this.tm < 1) {
            if (this.tm < 0) {
                this.tm = 0;
            }
            this.alpha = this.tm;
            this.scale(2-this.tm);
        }
        if (this.tm <= 0) {
            me.game.world.removeChild(this);
        }
        return true;
    }
});

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