public static void RenderTexture(SKCanvas canvas, SKBitmap bitmap, float x, float y, float orientation = 0,
float offsetX = 0, float offsetY = 0,
LabelStyle.HorizontalAlignmentEnum horizontalAlignment = LabelStyle.HorizontalAlignmentEnum.Center,
LabelStyle.VerticalAlignmentEnum verticalAlignment = LabelStyle.VerticalAlignmentEnum.Center,
float opacity = 1f,
float scale = 1f)
{
canvas.Save();
canvas.Translate(x, y);
canvas.RotateDegrees(orientation, 0, 0); // todo: or degrees?
canvas.Scale(scale, scale);
x = offsetX + DetermineHorizontalAlignmentCorrection(horizontalAlignment, bitmap.Width);
y = -offsetY + DetermineVerticalAlignmentCorrection(verticalAlignment, bitmap.Height);
var halfWidth = bitmap.Width/2;
var halfHeight = bitmap.Height/2;
var rect = new SKRect(x - halfWidth, y - halfHeight, x + halfWidth, y + halfHeight);
RenderTexture(canvas, bitmap, rect, opacity);
canvas.Restore();
}
// ExStart:RenderShapeToGraphics
public static string RenderShapeToGraphics(string dataDir, Shape shape)
{
ShapeRenderer r = shape.GetShapeRenderer();
// Find the size that the shape will be rendered to at the specified scale and resolution.
Size shapeSizeInPixels = r.GetSizeInPixels(1.0f, 96.0f);
// Rotating the shape may result in clipping as the image canvas is too small. Find the longest side
// And make sure that the graphics canvas is large enough to compensate for this.
int maxSide = System.Math.Max(shapeSizeInPixels.Width, shapeSizeInPixels.Height);
using (SkiaSharp.SKBitmap bitmap = new SkiaSharp.SKBitmap((int)(maxSide * 1.25), (int)(maxSide * 1.25)))
{
// Rendering to a graphics object means we can specify settings and transformations to be applied to
// The shape that is rendered. In our case we will rotate the rendered shape.
using (SkiaSharp.SKCanvas gr = new SkiaSharp.SKCanvas(bitmap))
{
// Clear the shape with the background color of the document.
gr.DrawColor(new SkiaSharp.SKColor(shape.Document.PageColor.R, shape.Document.PageColor.G, shape.Document.PageColor.B, shape.Document.PageColor.A));
// Center the rotation using translation method below
gr.Translate((float)bitmap.Width / 8, (float)bitmap.Height / 2);
// Rotate the image by 45 degrees.
gr.RotateDegrees(45);
// Undo the translation.
gr.Translate(-(float)bitmap.Width / 8, -(float)bitmap.Height / 2);
// Render the shape onto the graphics object.
r.RenderToSize(gr, 0, 0, shapeSizeInPixels.Width, shapeSizeInPixels.Height);
}
// Save output to file.
using (System.IO.FileStream fs = System.IO.File.Create(dataDir + "/RenderToSize_Out.png"))
{
SKData d = SKImage.FromBitmap(bitmap).Encode(SKEncodedImageFormat.Png, 100);
d.SaveTo(fs);
}
}
return("\nShape rendered to graphics successfully.\nFile saved at " + dataDir);
}
public void RotateDegrees(float degrees, float x, float y) => _canvas.RotateDegrees(degrees, x, y);
public static void ManageDrawMatrix (SKCanvas canvas, int width, int height)
{
var size = ((float)height > width ? width : height) * 0.5f;
var center = new SKPoint ((width - size) / 2f, (height - size) / 2f);
// draw these at specific locations
var leftRect = SKRect.Create (center.X - size / 2f, center.Y, size, size);
var rightRect = SKRect.Create (center.X + size / 2f, center.Y, size, size);
// draw this at the current location / transformation
var rotatedRect = SKRect.Create (0f, 0f, size, size);
using (var paint = new SKPaint ()) {
paint.IsAntialias = true;
canvas.Clear (XamPurple);
// draw
paint.Color = XamDkBlue;
canvas.DrawRect (leftRect, paint);
// save
canvas.Save();
// transform
canvas.Translate (width / 2f, center.Y);
canvas.RotateDegrees (45);
// draw
paint.Color = XamGreen;
canvas.DrawRect (rotatedRect, paint);
// undo transform / restore
canvas.Restore();
// draw
paint.Color = XamLtBlue;
canvas.DrawRect (rightRect, paint);
}
}