CODEWITHSUNDEEP
c#xnacroptexture2d
Toby Larone Barrett
Toby Larone Barrett

Reputation: 55

Cropping texture2d on all sides in xna c#

i am trying to crop a texture2d in xna. i have found the following code which will crop the image on the top and right sides, i have played around with the code and cannot figure a way to crop all sides at a specific interval. below is the code i have been trying to modify:

any help or ideas would be much appreciated. 

Rectangle area = new Rectangle(0, 0, 580, 480);

        Texture2D cropped = new Texture2D(heightMap1.GraphicsDevice, area.Width, area.Height);
        Color[] data = new Color[heightMap1.Width * heightMap1.Height];
        Color[] cropData = new Color[cropped.Width * cropped.Height];

        heightMap1.GetData(data);

        int index = 0;


        for (int y = 0; y < area.Y + area.Height; y++) // for each row
        {

                for (int x = 0; x < area.X + area.Width; x++) // for each column 
                {
                    cropData[index] = data[x + (y * heightMap1.Width)];
                    index++;
                }

        }

    cropped.SetData(cropData);

Upvotes: 1

Views: 2884

Answers (1)

Andrew Russell
Andrew Russell

Reputation: 27245

Here is the code to crop a texture. Note that the GetData method can already select rectangular subsection of the image - there is no need to manually crop.

// Get your texture
Texture2D texture = Content.Load<Texture2D>("myTexture");

// Calculate the cropped boundary
Rectangle newBounds = texture.Bounds;
const int resizeBy = 20;
newBounds.X += resizeBy;
newBounds.Y += resizeBy;
newBounds.Width -= resizeBy * 2;
newBounds.Height -= resizeBy * 2;

// Create a new texture of the desired size
Texture2D croppedTexture = new Texture2D(GraphicsDevice, newBounds.Width, newBounds.Height);

// Copy the data from the cropped region into a buffer, then into the new texture
Color[] data = new Color[newBounds.Width * newBounds.Height];
texture.GetData(0, newBounds, data, 0, newBounds.Width * newBounds.Height);
croppedTexture.SetData(data);

Of course, keep in mind that SpriteBatch.Draw can take a sourceRectangle parameter, so you may not even need to copy the texture data around at all! Just use a subsection of the original texture. For example:

spriteBatch.Draw(texture, Vector2.Zero, newBounds, Color.White);

(Where newBounds is calculated in the same way as in the first code listing.)

Upvotes: 3

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