public TextLayout(string text, Vector2 bounds, Font font, float fontSize, TextFormat format)
{
surface = GameEngine.TryQueryComponent<ISurface>();
if (surface == null) throw new InvalidOperationException("A surface must be registered before a text layout can be created.");
surface.DpiChanged += OnSurfaceDpiChanged;
this.text = text;
this.bounds = bounds;
this.font = font;
this.fontSize = fontSize;
this.format = format;
dpiChanged = false;
Glyphs = new List<PositionedGlyph>();
Layout();
}
/// <summary>
/// Draws formatted text.
/// </summary>
/// <param name="text">The text.</param>
/// <param name="bounds">The bounds the text will be displayed in.</param>
/// <param name="font">The font of the text.</param>
/// <param name="size">The font size in points.</param>
/// <param name="brush">The brush used to draw the text.</param>
/// <param name="format">The format of the text.</param>
public void DrawText(string text, Rectangle bounds, Font font, float size, TextFormat format, Brush brush)
{
var layout = new TextLayout(text, bounds.Size, font, size, format);
DrawTextLayout(layout, bounds.Location, brush);
}
/// <summary>
/// Draws text.
/// </summary>
/// <param name="text">The text.</param>
/// <param name="location">The location the text will be displayed at.</param>
/// <param name="font">The font of the text.</param>
/// <param name="size">The font size in points.</param>
/// <param name="brush">The brush used to draw the text.</param>
public void DrawText(string text, Vector2 location, Font font, float size, Brush brush)
{
if (string.IsNullOrWhiteSpace(text))
return;
float scale = (size * Dpi) / (72 * font.UnitsPerEm);
SetBrush(brush);
int horizontalPosition = 0;
int verticalPosition = font.Ascend;
for (int i = 0; i < text.Length; i++)
{
if (char.IsControl(text[i]))
{
switch (text[i])
{
case '\n':
verticalPosition += font.Ascend - font.Descend + font.LineGap;
horizontalPosition = 0;
break;
}
}
else
{
Font.Glyph glyph = font.GetGlyph(text[i]);
if (glyph.Vertices.Length > 0)
{
textMatrix = Matrix.Transpose(Matrix.Translation(horizontalPosition + glyph.LeftSideBearing, -verticalPosition, 0)
* Matrix.Scaling(scale, -scale, 1)
* Matrix.Translation(location.X, location.Y, 0));
UpdateMatrixBuffer();
brush.UpdateVertices(glyph.Vertices);
DrawVertices(glyph.Indices, glyph.Vertices);
}
horizontalPosition += glyph.AdvanceWidth;
}
}
textMatrix = Matrix.Identity;
UpdateMatrixBuffer();
}
