private void Form1_Shown(object sender, EventArgs e)
{
Debug.WriteLine("Form1_Shown");
Win32Surface = new Win32Surface(this.CreateGraphics().GetHdc());
FontContext = new Context(Win32Surface);
//CRITICAL: Format of Win32Surface and ImageSurface must be identical!
ImageSurface = new ImageSurface(Format.Rgb24, ClientSize.Width, ClientSize.Height);
BackContext = new Context(ImageSurface);
//Clear Surface2
BackContext.SetSourceColor(new Color(1,1,1));
BackContext.Operator = Operator.Source;
BackContext.Paint();
BackContext.Operator = Operator.Over;
var textFormat = DWriteCairo.CreateTextFormat(
"Arial",
FontWeight.Normal,
FontStyle.Normal,
FontStretch.Normal,
32f);
Debug.Assert(Math.Abs(textFormat.FontSize - 32f) < 0.0001);
const string s = "Hello World";
textLayout = DWriteCairo.CreateTextLayout(s, textFormat, 300, 40);
}
/// <summary>
/// CreateTextLayout takes a string, format, and associated constraints
/// and produces an object representing the fully analyzed
/// and formatted result.
/// </summary>
/// <param name="text">The text to layout.</param>
/// <param name="textFormat">The format to apply to the string.</param>
/// <param name="maxWidth">Width of the layout box.</param>
/// <param name="maxHeight">Height of the layout box.</param>
/// <returns>
/// The resultant object.
/// </returns>
public static TextLayout CreateTextLayout(string text, TextFormat textFormat, int maxWidth, int maxHeight)
{
var ptr = Factory.CreateTextLayout(text,
text.Length, textFormat.Handle, maxWidth, maxHeight);
var dWriteTextLayout = new TextLayout(ptr);
return dWriteTextLayout;
}
private void Form1_Shown(object sender, EventArgs e)
{
Debug.WriteLine("Form1_Shown");
surface = new Win32Surface(this.CreateGraphics().GetHdc());
context = new Context(surface);
textFormat = DWriteCairo.CreateTextFormat(
"Consolas",
FontWeight.Normal,
FontStyle.Normal,
FontStretch.Normal,
12);
textFormat.TextAlignment = TextAlignment.Center;
float left, top, width, height;
// get actual size of the text
var measureLayout = DWriteCairo.CreateTextLayout(s, textFormat, 4096, 4096);
measureLayout.GetRect(out left, out top, out width, out height);
measureLayout.Dispose();
// build text context against the size and format
textLayout = DWriteCairo.CreateTextLayout(s, textFormat, (int)Math.Ceiling(width), (int)Math.Ceiling(height));
Debug.WriteLine("showing layout");
Path path = DWriteCairo.RenderLayoutToCairoPath(context, textLayout);
context.AppendPath(path);
context.Fill();
textLayout.GetRect(out left, out top, out width, out height);
textRect = new System.Drawing.RectangleF(left, top, width, height);
context.Rectangle(left, top, width, height);
context.Stroke();
context.GetTarget().Flush();
}
internal Path RenderToCairoPath(Context context, DirectWriteCairoTextRenderer render, TextLayout textLayout)
{
//Debug.WriteLine("Before `Draw`: Current point at <{0},{1}>", (float)context.CurrentPoint.X, (float)context.CurrentPoint.Y);
Draw(context.Handle, render, (float)context.CurrentPoint.X, (float)context.CurrentPoint.Y);
var result = context.CopyPath();
context.NewPath();
return result;
}
/// <summary>
/// Show the layout
/// </summary>
/// <param name="context">a Cairo context</param>
/// <param name="textLayout">the layout to show</param>
public static Path RenderLayoutToCairoPath(Cairo.Context context, TextLayout textLayout)
{
return textLayout.RenderToCairoPath(context, Render, textLayout);
}
