public void setZoom(float zoom) {
		if (zoom > this.max_zoom || zoom < this.min_zoom)
			return;
		if (this.zoomElement) {
			this.taille_noeud = taille_noeud / this.zoom * zoom;
			this.decalage_passage = decalage_passage / this.zoom * zoom;
			this.largeur_chausse = largeur_chausse / this.zoom * zoom;
			this.larg_paint = larg_paint / this.zoom * zoom;
		}
		this.zoom = zoom;
	}