I try use the scale with monogame and for this I modify the sourceRectangle too for the hitbox but when I'm trying to assign 0.5 for scale the sourceRectangle.Width and Height = 0
because my calcul is
sourceRectangle.Width = (texture.Width / cols) * (int)this.scale.X
sourceRectangle.Height = (texture.Height / rows) * (int)this.scale.Y
Thanks for your help
It looks to me like you've got your casting in the wrong place. The scale is getting rounded down to zero before it gets multiplied.
Try this instead:
sourceRectangle.Width = (int)((texture.Width / cols) * this.scale.X);
sourceRectangle.Height = (int)((texture.Height / rows) * this.scale.Y);