CODEWITHSUNDEEP
c#xna
Duncan Palmer
Duncan Palmer

Reputation: 2913

Trouble multiplying a double with an int

So basically i'm making healthbars for my enemies in my C# XNA game. I am getting the percentage of health left so e.g. 80/100 = 0.8 = 80% so my game knows how big to draw the green portion of the health bar. So if there is 80% hp it will draw the healthbar to 80%. The problem I am having is as soon as the health goes down from 100, the percentage automatically gets dropped to 0.0/0% and nothing is drawn. Here is my code:

            //calculate the width of the green portion of healbar
        //zDay.Game1.hp_top.Width = Original size of image (35px)
        float size = (hp/max_hp) * zDay.Game1.hp_top.Width;

        //draw percentage of health
        sb.DrawString(zDay.Game1.CourierNew, (hp/max_hp).ToString(), new Vector2(50, 80), Color.Black);
        //draw size of green portion
        sb.DrawString(zDay.Game1.CourierNew, (size).ToString(), new Vector2(50, 50), Color.Black);

        //draw green portion of health bar
        Rectangle bg = new Rectangle(x - 20, y - 30, (int)size, zDay.Game1.hp_top.Height);
        sb.Draw(zDay.Game1.hp_top, bg, Color.White);

Any ideas as to why this is happening?

Upvotes: 0

Views: 111

Answers (1)

username tbd
username tbd

Reputation: 9382

I would guess that the issue isn't with multiplication, but division; the statement:

(hp/max_hp)

is most likely being evaluated to zero (since you're diving by int's (I assume) and the result will be between 0 and 1, or in Integer terms, 0).

Try using

((float)hp/(float)max_hp)

Instead.

Upvotes: 2

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