int ComputeSpacing(FontSpacing lhs, FontSpacing rhs)
{
if (lhs == null)
{
return(0);
}
return(Math.Min(lhs.BottomRight + rhs.BottomLeft, Math.Min(lhs.CenterRight + rhs.CenterLeft, lhs.TopRight + rhs.TopLeft)));
}
int MeasureWidth(string text, double size)
{
double factor = size / fontsize;
double width = -fontspacing * factor;
FontSpacing lastspacing = null;
foreach (char character in text)
{
if (glyphs.ContainsKey(character))
{
Glyph glyph = glyphs[character];
width -= ComputeSpacing(lastspacing, glyph.Spacing);
width += fontspacing * factor;
width += glyph.Width * factor;
lastspacing = glyph.Spacing;
}
}
return((int)Math.Max(0, width));
}
/// <summary>
/// draws a text to an image
/// </summary>
/// <param name="text">text to draw</param>
/// <param name="size">font size</param>
/// <param name="target">image to draw to</param>
/// <param name="blend">blend color</param>
/// <param name="x">target x</param>
/// <param name="y">target y</param>
public void DrawText(string text, float size, Image target, Color blend, float x = 0.0f, float y = 0.0f)
{
if (uppercase)
{
text = text.ToUpper();
}
ColorMatrix colormatrix = new ColorMatrix(new[] {
new[] { blend.R / 255.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new[] { 0.0f, blend.G / 255.0f, 0.0f, 0.0f, 0.0f },
new[] { 0.0f, 0.0f, blend.B / 255.0f, 0.0f, 0.0f },
new[] { 0.0f, 0.0f, 0.0f, blend.A / 255.0f, 0.0f },
new[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
});
ImageAttributes attributes = new ImageAttributes();
attributes.SetColorMatrix(colormatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
float factor = size / fontsize;
FontSpacing lastspacing = null;
using (Graphics g = Graphics.FromImage(target)) {
foreach (char character in text)
{
if (glyphs.ContainsKey(character))
{
Glyph glyph = glyphs[character];
x -= ComputeSpacing(lastspacing, glyph.Spacing);
g.DrawImage(atlas,
new Rectangle((int)x, (int)(y + size - glyph.Height * factor), (int)(glyph.Width * factor), (int)(glyph.Height * factor)),
glyph.X, glyph.Y, glyph.Width, (float)glyph.Height,
GraphicsUnit.Pixel, attributes);
x += (glyph.Width + fontspacing) * factor;
lastspacing = glyph.Spacing;
}
}
}
}
