GradientFloatImage.cs

This code demonstrates how to create a vertical gradient image with values between 0.0 and 5.0. Lines are written one by one from the bottom to the top.

using IOLink;
using System;
using System.Runtime.Intrinsics;
 
namespace Examples
{
    public class GradientFloatImage
    {
        static ImageView Generate(VectorXu64 shape)
        {
            // To create a float ImageView, the datatype of the
            // image can be FLOAT (32bits) or DOUBLE (64 bits)
            DataType dt = DataTypeId.FLOAT;
 
            // create an image view in CPU memory
            ImageView image = ImageViewFactory.Allocate(shape, dt);
 
            // create a buffer to write a line of data
            // this buffer is float-typed to match the image
            // datatype
            float[] lineBuffer = new float[shape[0]];
 
            VectorXu64 lineSize = new VectorXu64(shape[0], 1);
 
            // define the step between two values in the gradient
            float stepLine = 5.0f / shape[1];
 
            Console.WriteLine("Writing data slice by slice, line by line");
 
            // write data slice by slice, line by line with a
            // growing value
            float valueInit = 0;
            float valueToSet = valueInit;
 
            for (ulong j = 0; j < shape[1]; ++j)
            {
                RegionXu64 lineRegion = new RegionXu64(new VectorXu64(0, j), lineSize);
 
                // fill buffer with the same value
                Array.Fill(lineBuffer, valueToSet);
 
                image.WriteRegion(lineRegion, lineBuffer);
                valueToSet = valueInit + stepLine * j;
            }
 
            Console.WriteLine("Writing completed");
 
            return image;
        }
 
        // Display the content of an ImageView containing values
        // of type float
        private static void displayImageContent(ImageView image)
        {
            VectorXu64 shape = image.Shape;
            RegionXu64 fullRegion = RegionXu64.CreateFullRegion(image.Shape);
            float[] buffer = new float[fullRegion.ElementCount];
            image.ReadRegion(fullRegion, buffer);
            Console.WriteLine("Image content: ");
            for (ulong j = 0; j < shape[1]; ++j)
            {
                for (ulong i = 0; i < shape[0]; ++i)
                {
                    Console.Write(buffer[i + j * shape[0]] + " ");
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }
 
        public static void Main(string[] args)
        {
            ImageView image = Generate(new VectorXu64(5, 30));
 
            Console.WriteLine("Shape of generated image: " + image.Shape.ToString());
 
            displayImageContent(image);
 
            Console.WriteLine("SUCCESS");
        }
    }
}