Problem with drawing part of Texture2D [HealthBar]

Graphics
1

Hello,

I was trying to implement a HeathBar. I need two heathbars for two characters, and for 1st bar when I cut the health texture from Right to Left everything is working fine. But now I need to do the opposite, I need to cut a texture from Left to Right (image).

HealthBars.png994×58 30.7 KB

And I don’t know how to do it properly.

It’s my method where I calculate % of texture according to the current HP and then I set the sourceRectangle.
As I said for the right bar method is cutting from right to left and I don’t know how to change it.

` public void Draw(SpriteBatch spriteBatch, double hp, bool isMonster, Vector2 cameraPos)
{
double healthIntoTexture = (hp * fullHealthInPixels) / (double)MaxHp;

        rectanglHealthLeft = new Rectangle(0, 0, (int)healthIntoTexture, healthTextureLeft.Height);
        rectanglHealthRight = new Rectangle(0, 0, (int)healthIntoTexture, healthTextureRight.Height); // ???????

        rectangleForBar = new Rectangle(0, 0, barTextureLeft.Width, barTextureLeft.Height);

        var originLeft = new Vector2(rectanglHealthLeft.Left, rectanglHealthLeft.Top);
        var originRight = new Vector2(rectanglHealthRight.Left, rectanglHealthRight.Top);

        var originBar = new Vector2(rectangleForBar.Left, rectangleForBar.Top);

        if (isMonster)
        {
            spriteBatch.Draw(barTextureLeft, new Vector2(cameraPos.X + 200 - 3, cameraPos.Y + 50 - 4), rectangleForBar, Color.White, 0.0f, originBar, 0.5f, SpriteEffects.None, 0.0f);
            spriteBatch.Draw(healthTextureLeft, new Vector2(cameraPos.X + 200, cameraPos.Y + 50), rectanglHealthLeft, Color.White, 0.0f, originLeft, 0.5f, SpriteEffects.None, 0.0f);
        }
        else
        {
            spriteBatch.Draw(barTextureRight, new Vector2(cameraPos.X + 1000 - 8, cameraPos.Y + 50 - 4), rectangleForBar, Color.White, 0.0f, originBar, 0.5f, SpriteEffects.None, 0.0f); 
            spriteBatch.Draw(healthTextureRight, new Vector2(cameraPos.X + 1000, cameraPos.Y + 50), rectanglHealthRight, Color.White, 0.0f, originRight, 0.5f, SpriteEffects.None, 0.0f); // ???
        }
    }`
2

Uff I did it, still i’m not completly sure how it works.

` public void Draw(SpriteBatch spriteBatch, double hp, bool isMonster, Vector2 cameraPos)
{
double healthIntoTexture = (hp * fullHealthInPixels) / (double)MaxHp;

        if (hp <= 0) healthIntoTexture = 0;

        rectanglHealthLeft = new Rectangle(0, 0, (int)healthIntoTexture, healthTextureLeft.Height);

        var offset = (int)fullHealthInPixels - (int)healthIntoTexture;
        rectanglHealthRight = new Rectangle(offset, 0, (int)fullHealthInPixels - offset, healthTextureRight.Height); // ???????

        rectangleForBar = new Rectangle(0, 0, barTextureLeft.Width, barTextureLeft.Height);

        var originLeft = new Vector2(rectanglHealthLeft.Left, rectanglHealthLeft.Top);
        var originRight = new Vector2(rectanglHealthRight.Left, rectanglHealthRight.Top);

        var originBar = new Vector2(rectangleForBar.Left, rectangleForBar.Top);

        if (isMonster)
        {
            spriteBatch.Draw(barTextureLeft, new Vector2(cameraPos.X + 200 - 3, cameraPos.Y + 50 - 4), rectangleForBar, Color.White, 0.0f, originBar, 0.5f, SpriteEffects.None, 0.0f);
            spriteBatch.Draw(healthTextureLeft, new Vector2(cameraPos.X + 200, cameraPos.Y + 50), rectanglHealthLeft, Color.White, 0.0f, originLeft, 0.5f, SpriteEffects.None, 0.0f);
        }
        else
        {
            spriteBatch.Draw(barTextureRight, new Vector2(cameraPos.X + 1000 - 8, cameraPos.Y + 50 - 4), rectangleForBar, Color.White, 0.0f, originBar, 0.5f, SpriteEffects.None, 0.0f);
            spriteBatch.Draw(healthTextureRight, new Vector2(cameraPos.X + 1000 + offset, cameraPos.Y + 50), rectanglHealthRight, Color.White, 0.0f, originRight, 0.5f, SpriteEffects.None, 0.0f);
        }
    }`