public BitmapText(IBitmapFont bitmapFont, IBrush brush, string text, TexcoordGenerationMode uMappingMode = TexcoordGenerationMode.FullBoundingBox, TexcoordGenerationMode vMappingMode = TexcoordGenerationMode.FullBoundingBox, HAlignment hAlignment = HAlignment.Middle, VAlignment vAlignment = VAlignment.Middle)
{
Transform = (ConstantMatrix) Matrix.Identity;
Rectangle fullRect = bitmapFont.Measure(text);
Vector3 centerOffset = Vector3.Zero;
switch (hAlignment)
{
case HAlignment.Left:
centerOffset.X = 0;
break;
case HAlignment.Middle:
centerOffset.X = fullRect.Width / 2f;
break;
case HAlignment.Right:
centerOffset.X = fullRect.Width;
break;
}
switch (vAlignment)
{
case VAlignment.Top:
centerOffset.Y = 0;
break;
case VAlignment.Middle:
centerOffset.Y = fullRect.Height / 2f;
break;
case VAlignment.Bottom:
centerOffset.Y = fullRect.Height;
break;
}
_bitmapFont = bitmapFont as BitmapFont;
var pageCount = _bitmapFont.PageLayers.Count;
_text = text;
Brush = brush;
_textQuads = new IIndexedMesh[pageCount];
var charactersByPage = (from char ch in text
select new KeyValuePair<int, char>(_bitmapFont.Chars[ch].Page, ch)).ToMultiValueDictionary();
var w = (float)_bitmapFont.ScaleW;
var h = (float)_bitmapFont.ScaleH;
var xPos = 0f;
foreach (var kvp in charactersByPage)
{
var charCount = kvp.Value.Count;
_textQuads[kvp.Key] = new IndexedMesh(charCount * 4, charCount * 6)
{
Brush = new TextBrush { TextLayer = _bitmapFont.PageLayers[kvp.Key], SubBrush = Brush }
};
}
var vertexIndexCounts = (from i in Enumerable.Range(0, _bitmapFont.Pages.Count)
select Tuple.Create(0, 0)).ToArray();
foreach (var ch in text)
{
var ci = _bitmapFont.Chars[ch];
var vertices = _textQuads[ci.Page].Vertices;
var indices = _textQuads[ci.Page].Indices;
var vertexCount = vertexIndexCounts[ci.Page].Item1;
var indexCount = vertexIndexCounts[ci.Page].Item2;
var saveVertexCount = vertexCount;
Vector2 quadTopLeft;
Vector2 quadTopRight;
Vector2 quadBottomRight;
Vector2 quadBottomLeft;
var left = xPos + ci.XOffset;
var top = 0f + ci.YOffset;
switch (uMappingMode)
{
case TexcoordGenerationMode.PerQuad:
quadTopLeft.X = 0f;
quadTopRight.X = 1f;
quadBottomRight.X = 1f;
quadBottomLeft.X = 0f;
break;
// These two modes are the same in this case
case TexcoordGenerationMode.FullBoundingBox:
case TexcoordGenerationMode.Unwrapped_Linear:
quadTopLeft.X = left / fullRect.Width;
quadTopRight.X = (left + ci.Width) / fullRect.Width;
quadBottomRight.X = (left + ci.Width) / fullRect.Width;
quadBottomLeft.X = left / fullRect.Width;
break;
default:
throw new NotSupportedException(string.Format("Unsupported texture mapping mode along X-Axis: {0}", uMappingMode));
}
switch (vMappingMode)
{
case TexcoordGenerationMode.PerQuad:
quadTopLeft.Y = 0f;
quadTopRight.Y = 0f;
quadBottomRight.Y = 1f;
quadBottomLeft.Y = 1f;
break;
// These two modes are the same in this case
case TexcoordGenerationMode.FullBoundingBox:
case TexcoordGenerationMode.Unwrapped_Linear:
quadTopLeft.Y = top / fullRect.Height;
quadTopRight.Y = top / fullRect.Height;
quadBottomRight.Y = (top + ci.Height) / fullRect.Height;
quadBottomLeft.Y = (top + ci.Height) / fullRect.Height;
break;
default:
throw new NotSupportedException(string.Format("Unsupported texture mapping mode along Y-Axis: {0}", vMappingMode));
}
var topLeft = new Texcoords(quadTopLeft, new Vector2(ci.X / w, ci.Y / h));
var topRight = new Texcoords(quadTopRight, new Vector2(((ci.X + ci.Width) / w), ci.Y / h));
var bottomRight = new Texcoords(quadBottomRight, new Vector2(((ci.X + ci.Width) / w), ((ci.Y + ci.Height) / h)));
var bottomLeft = new Texcoords(quadBottomLeft, new Vector2(ci.X / w, ((ci.Y + ci.Height) / h)));
vertices[vertexCount++] = new Vertex
{
Position = new Vector3(left - centerOffset.X, top - centerOffset.Y, 0f),
Texcoords = topLeft,
Color = Color.White
};
vertices[vertexCount++] = new Vertex
{
Position = new Vector3(left + ci.Width - centerOffset.X, top - centerOffset.Y, 0f),
Texcoords = topRight,
Color = Color.White
};
vertices[vertexCount++] = new Vertex
{
Position = new Vector3(left + ci.Width - centerOffset.X, top + ci.Height - centerOffset.Y, 0f),
Texcoords = bottomRight,
Color = Color.White
};
vertices[vertexCount++] = new Vertex
{
Position = new Vector3(left - centerOffset.X, top + ci.Height - centerOffset.Y, 0f),
Texcoords = bottomLeft,
Color = Color.White
};
xPos += ci.XAdvance;
indices[indexCount++] = (short)(saveVertexCount + 0);
indices[indexCount++] = (short)(saveVertexCount + 1);
indices[indexCount++] = (short)(saveVertexCount + 2);
indices[indexCount++] = (short)(saveVertexCount + 0);
indices[indexCount++] = (short)(saveVertexCount + 2);
indices[indexCount++] = (short)(saveVertexCount + 3);
vertexIndexCounts[ci.Page] = Tuple.Create(vertexCount, indexCount);
}
}
public static IBitmapText Build(this IBitmapFont font, string text, IBrush brush, TexcoordGenerationMode uMappingMode = TexcoordGenerationMode.FullBoundingBox, TexcoordGenerationMode vMappingMode = TexcoordGenerationMode.FullBoundingBox, HAlignment hAlignment = HAlignment.Middle, VAlignment vAlignment = VAlignment.Middle)
{
return new BitmapText(font as BitmapFont, brush, text, uMappingMode, vMappingMode, hAlignment, vAlignment);
}