/// <summary>
/// Projects the given image onto a base image.
/// </summary>
/// <param name="projectImageFilename">Path to image to be projected.</param>
/// <param name="baseImageFilename">Path to base image.</param>
/// <param name="topLeft">Top-left corner of the projection region.</param>
/// <param name="topRight">Top-right corner of the projection region.</param>
/// <param name="bottomLeft">Bottom-left corner of the projection region.</param>
/// <param name="bottomRight">Bottom-right corner of the projection region.</param>
/// <returns>An image containing the given input projected onto the base image.</returns>
public static Image <Rgba32> ProjectOnto(string projectImageFilename, string baseImageFilename,
Point topLeft,
Point topRight,
Point bottomLeft,
Point bottomRight)
{
using (var projectImage = Image.Load(projectImageFilename))
using (var baseImage = Image.Load(baseImageFilename))
{
//declare without using statement (need to return this so can't dispose of it)
var outputImage = new Image <Rgba32>(baseImage.Width, baseImage.Height);
//compute the transformation matrix based on the destination points and apply it to the input image
Matrix4x4 transformMat = TransformHelper.ComputeTransformMatrix(projectImage.Width, projectImage.Height, topLeft, topRight, bottomLeft, bottomRight);
//project the image according to the input points (and realign it to fix any EXIF bugs)
projectImage.Mutate(x => x.AutoOrient());
projectImage.Mutate(x => x.Transform(new ProjectiveTransformBuilder().AppendMatrix(transformMat)));
//draw the base image on top of the projected image
outputImage.Mutate(x => x.DrawImage(projectImage, 1.0f));
outputImage.Mutate(x => x.DrawImage(baseImage, new Point(0, 0), 1.0f));
return(outputImage);
}
}
/// <summary>
/// Projects the given text onto a base image.
/// </summary>
/// <param name="text">The text to be projected.</param>
/// <param name="baseImageFilename">Path to base image.</param>
/// <param name="topLeft">Top-left corner of the projection region.</param>
/// <param name="topRight">Top-right corner of the projection region.</param>
/// <param name="bottomLeft">Bottom-left corner of the projection region.</param>
/// <param name="bottomRight">Bottom-right corner of the projection region.</param>
/// <returns>The base image with the given text projected onto it.</returns>
public static Image <Rgba32> ProjectText(string text, string baseImageFilename,
Point topLeft,
Point topRight,
Point bottomLeft,
Point bottomRight)
{
using (var baseImage = Image.Load(baseImageFilename))
using (var textImage = new Image <Rgba32>(1920, 1080))
{
var outputImage = new Image <Rgba32>(baseImage.Width, baseImage.Height);
int fontSize = textImage.Width / 10;
Font font = SystemFonts.CreateFont("Impact", fontSize);
//determine text location
float padding = 10f;
float textMaxWidth = textImage.Width - (padding * 2);
PointF topLeftLocation = new PointF(padding, padding * 2);
//black brush for text fill
SolidBrush brush = new SolidBrush(Color.Black);
//wrap and align text before drawing
TextGraphicsOptions options = new TextGraphicsOptions()
{
TextOptions = new TextOptions()
{
WrapTextWidth = textMaxWidth,
HorizontalAlignment = HorizontalAlignment.Center
}
};
//draw text on the text canvas
textImage.Mutate(x => x.BackgroundColor(Color.White));
textImage.Mutate(x => x.DrawText(options, text, font, brush, topLeftLocation));
//compute the transformation matrix based on the destination points and apply it to the text image
Matrix4x4 transformMat = TransformHelper.ComputeTransformMatrix(textImage.Width, textImage.Height, topLeft, topRight, bottomLeft, bottomRight);
textImage.Mutate(x => x.Transform(new ProjectiveTransformBuilder().AppendMatrix(transformMat)));
//draw the projected text and the base image on the output image
outputImage.Mutate(x => x.DrawImage(textImage, new Point(0, 0), 1.0f));
outputImage.Mutate(x => x.DrawImage(baseImage, 1.0f));
return(outputImage);
}
}
