/// <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;
}
/// <summary>
/// Create a text format object used for text layout.
/// </summary>
/// <param name="fontFamilyName">Name of the font family</param>
/// <param name="fontWeight">Font weight</param>
/// <param name="fontStyle">Font style</param>
/// <param name="fontStretch">Font stretch</param>
/// <param name="fontSize">Logical size of the font in DIP units. A DIP ("device-independent pixel") equals 1/96 inch.</param>
/// <param name="localeName">Locale name(optional)</param>
/// TODO understand the meaning of Locale name
/// <returns> newly created text format object </returns>
public static TextFormat CreateTextFormat(
string fontFamilyName,
FontWeight fontWeight, FontStyle fontStyle, FontStretch fontStretch,
float fontSize,
string localeName = "en-us")
{
var ptr = Factory.CreateTextFormat(fontFamilyName, IntPtr.Zero,
fontWeight,
fontStyle, fontStretch, fontSize,
localeName);
var dWriteTextFormat = new TextFormat(ptr);
return dWriteTextFormat;
}
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();
}