/// <summary>Reserves the required space in the vertex and index arrays</summary>
/// <param name="font">Font the vertices for the letters will be taken from</param>
/// <param name="text">String of which a mesh will be built</param>
private void resizeVertexAndIndexArrays(VectorFont font, string text)
{
int vertexCount = 0;
int indexCount = 0;
// Count the vertices and indices requires for all characters in the string
for (int index = 0; index < text.Length; ++index)
{
int fontCharacterIndex;
// Try to find the current character in the font's character map. If it isn't
// there, we'll ignore it, just like the mesh creation routine does.
if (font.CharacterMap.TryGetValue(text[index], out fontCharacterIndex))
{
VectorFontCharacter character = font.Characters[fontCharacterIndex];
vertexCount += character.Vertices.Count * 2; // multiply by 2 for front and
indexCount += character.Faces.Count * 3 * 2; // back face of the mesh
// There may be empty characters (characters without a visual representation
// in the font, so we need to check this before accessing the outline array
if (character.Outlines.Count > 0)
{
VectorFontCharacter.Outline finalOutline =
character.Outlines[character.Outlines.Count - 1];
int outlineVertexCount = finalOutline.StartVertexIndex + finalOutline.VertexCount;
indexCount += outlineVertexCount * 6; // 2 triangles each
}
}
}
this.vertices = new VertexPositionNormalTexture[vertexCount];
this.indices = new short[indexCount];
}
/// <summary>Reserves the required space in the vertex and index arrays</summary>
/// <param name="font">Font the vertices for the letters will be taken from</param>
/// <param name="text">String of which a mesh will be built</param>
private void resizeVertexAndIndexArrays(VectorFont font, string text)
{
int vertexCount = 0;
int indexCount = 0;
// Count the vertices and indices requires for all characters in the string
for (int index = 0; index < text.Length; ++index)
{
int fontCharacterIndex;
// Try to find the current character in the font's character map. If it isn't
// there, we'll ignore it, just like the vertex creation routine does.
if (font.CharacterMap.TryGetValue(text[index], out fontCharacterIndex))
{
VectorFontCharacter character = font.Characters[fontCharacterIndex];
// There may be empty characters (characters without a visual representation
// in the font, so we need to check this before accessing the outline array
if (character.Outlines.Count > 0)
{
VectorFontCharacter.Outline finalOutline =
character.Outlines[character.Outlines.Count - 1];
// We calculate the vertex count from the outline instead of just taking
// the size of the vertex array because we might not need all vertices to
// render an outline (some have been added by the tessellation processor and
// are only used as supporting vertices to fill the faces)
int outlineVertexCount = finalOutline.StartVertexIndex + finalOutline.VertexCount;
// Advance the counters
vertexCount += outlineVertexCount;
indexCount += outlineVertexCount * 2;
}
}
}
this.vertices = new VertexPositionNormalTexture[vertexCount];
this.indices = new short[indexCount];
}
/// <summary>Builds the combined outline for the letters in this string</summary>
/// <param name="font">Vector font to take the vertex data from</param>
/// <param name="text">String of which a mesh is to be built</param>
private void buildStringOutline(VectorFont font, string text)
{
Vector2 position = Vector2.Zero;
int baseVertexIndex = 0; // base index in the vertex array
int baseIndexIndex = 0; // base index in the index array
for (int characterIndex = 0; characterIndex < text.Length; ++characterIndex)
{
int fontCharacterIndex;
// Only add this character to the mesh if there is an actual font character
// for this unicode symbol in the font (characters not imported by the user
// will be silently skipped -- this is the only sane option imho)
if (font.CharacterMap.TryGetValue(text[characterIndex], out fontCharacterIndex))
{
VectorFontCharacter character = font.Characters[fontCharacterIndex];
if (character.Outlines.Count > 0)
{
VectorFontCharacter.Outline finalOutline =
character.Outlines[character.Outlines.Count - 1];
// We calculate the vertex count from the outline instead of just taking
// the size of the vertex array because we might not need all vertices to
// render an outline (some have been added by the tessellation processor and
// are only used as supporting vertices to fill the faces)
int outlineVertexCount = finalOutline.StartVertexIndex + finalOutline.VertexCount;
// Import all of the vertices of this font (we need both the outline vertices
// as well as the mesh supporting vertices)
for (int index = 0; index < outlineVertexCount; ++index)
{
this.vertices[baseVertexIndex + index] = new VertexPositionNormalTexture(
new Vector3(character.Vertices[index] + position, 0.0f),
Vector3.Forward, Vector2.Zero
);
}
// Transform the outline index ranges into single big line list pointing
// to the vertices we just imported from the font
for (int index = 0; index < character.Outlines.Count; ++index)
{
VectorFontCharacter.Outline outline = character.Outlines[index];
// Set up the indices for the outline exluding the final connection from
// the outline's end to its start
for (int lineIndex = 0; lineIndex < outline.VertexCount - 1; ++lineIndex)
{
this.indices[baseIndexIndex + lineIndex * 2 + 0] =
(short)(baseVertexIndex + outline.StartVertexIndex + lineIndex);
this.indices[baseIndexIndex + lineIndex * 2 + 1] =
(short)(baseVertexIndex + outline.StartVertexIndex + lineIndex + 1);
}
// Add the connection from the end of the outline to its start
this.indices[baseIndexIndex + outline.VertexCount * 2 - 2] =
(short)(baseVertexIndex + outline.StartVertexIndex + outline.VertexCount - 1);
this.indices[baseIndexIndex + outline.VertexCount * 2 - 1] =
(short)(baseVertexIndex + outline.StartVertexIndex);
// Advance the index pointer for the next run
baseIndexIndex += outline.VertexCount * 2;
}
// Adjust the base vertex index for the next character
baseVertexIndex += outlineVertexCount;
}
// Advance to the next character
position += character.Advancement;
} // if
} // for
this.width = position.X;
this.height = font.LineHeight;
this.primitiveType = PrimitiveType.LineList;
}
/// <summary>Builds the combined mesh for the letters in this string</summary>
/// <param name="font">Vector font to take the vertex data from</param>
/// <param name="text">String of which a mesh is to be built</param>
private void buildStringMesh(VectorFont font, string text)
{
Vector2 position = Vector2.Zero;
int baseVertexIndex = 0; // base index in the vertex array
int baseIndexIndex = 0; // base index in the index array
for (int characterIndex = 0; characterIndex < text.Length; ++characterIndex)
{
int fontCharacterIndex;
// Only add this character to the mesh if there is an actual font character
// for this unicode symbol in the font (characters not imported by the user
// will be silently skipped -- this is the only sane option imho)
if (font.CharacterMap.TryGetValue(text[characterIndex], out fontCharacterIndex))
{
VectorFontCharacter character = font.Characters[fontCharacterIndex];
// Import all of the vertices of this font (we need both the outline vertices
// as well as the mesh supporting vertices). Each vertex is imported two times,
// once with a z coordinate of -0.5 and once with a z coordinate of +0.5
for (int vertexIndex = 0; vertexIndex < character.Vertices.Count; ++vertexIndex)
{
Vector2 adjustedPosition = character.Vertices[vertexIndex] + position;
Vector3 frontPosition = new Vector3(adjustedPosition, -0.5f);
Vector3 backPosition = new Vector3(adjustedPosition, +0.5f);
Vector2 textureCoordinates = new Vector2(
(frontPosition.X / font.LineHeight + frontPosition.Z) / 2.0f,
frontPosition.Y / font.LineHeight
);
this.vertices[baseVertexIndex + vertexIndex * 2 + 0] = new TextVertex(
frontPosition, Vector3.Forward, textureCoordinates
);
this.vertices[baseVertexIndex + vertexIndex * 2 + 1] = new TextVertex(
backPosition, Vector3.Backward, textureCoordinates
);
}
// Transform the outline index ranges into single big line list pointing
// to the vertices we just imported from the font
for (int index = 0; index < character.Outlines.Count; ++index)
{
VectorFontCharacter.Outline outline = character.Outlines[index];
int startIndex, endIndex;
// Set up the indices for the outline exluding the final connection from
// the outline's end to its start
for (int lineIndex = 0; lineIndex < outline.VertexCount - 1; ++lineIndex)
{
startIndex = baseVertexIndex + (outline.StartVertexIndex + lineIndex) * 2;
endIndex = startIndex + 2;
this.indices[baseIndexIndex + lineIndex * 6 + 0] = (short)(startIndex + 0);
this.indices[baseIndexIndex + lineIndex * 6 + 1] = (short)(startIndex + 1);
this.indices[baseIndexIndex + lineIndex * 6 + 2] = (short)(endIndex + 0);
this.indices[baseIndexIndex + lineIndex * 6 + 3] = (short)(endIndex + 0);
this.indices[baseIndexIndex + lineIndex * 6 + 4] = (short)(startIndex + 1);
this.indices[baseIndexIndex + lineIndex * 6 + 5] = (short)(endIndex + 1);
}
int lastLineIndex = outline.VertexCount - 1;
startIndex = baseVertexIndex + outline.StartVertexIndex * 2;
endIndex = startIndex + lastLineIndex * 2;
this.indices[baseIndexIndex + lastLineIndex * 6 + 0] = (short)(startIndex + 0);
this.indices[baseIndexIndex + lastLineIndex * 6 + 1] = (short)(startIndex + 1);
this.indices[baseIndexIndex + lastLineIndex * 6 + 2] = (short)(endIndex + 0);
this.indices[baseIndexIndex + lastLineIndex * 6 + 3] = (short)(endIndex + 0);
this.indices[baseIndexIndex + lastLineIndex * 6 + 4] = (short)(startIndex + 1);
this.indices[baseIndexIndex + lastLineIndex * 6 + 5] = (short)(endIndex + 1);
// Advance the index pointer for the next run
baseIndexIndex += outline.VertexCount * 6;
}
// Add the indices for the vertices of font's faces, once for the front face and
// once for the back face we generated.
for (int faceIndex = 0; faceIndex < character.Faces.Count; ++faceIndex)
{
this.indices[baseIndexIndex + faceIndex * 6 + 0] =
(short)(character.Faces[faceIndex].FirstVertexIndex * 2 + baseVertexIndex);
this.indices[baseIndexIndex + faceIndex * 6 + 1] =
(short)(character.Faces[faceIndex].SecondVertexIndex * 2 + baseVertexIndex);
this.indices[baseIndexIndex + faceIndex * 6 + 2] =
(short)(character.Faces[faceIndex].ThirdVertexIndex * 2 + baseVertexIndex);
this.indices[baseIndexIndex + faceIndex * 6 + 3] =
(short)(character.Faces[faceIndex].FirstVertexIndex * 2 + baseVertexIndex + 1);
this.indices[baseIndexIndex + faceIndex * 6 + 4] =
(short)(character.Faces[faceIndex].SecondVertexIndex * 2 + baseVertexIndex + 1);
this.indices[baseIndexIndex + faceIndex * 6 + 5] =
(short)(character.Faces[faceIndex].ThirdVertexIndex * 2 + baseVertexIndex + 1);
}
// Adjust the base vertex index for the next character
baseIndexIndex += character.Faces.Count * 6;
baseVertexIndex += character.Vertices.Count * 2;
// Update the position to the next character
position += character.Advancement;
} // if
} // for
this.width = position.X;
this.height = font.LineHeight;
this.primitiveType = PrimitiveType.TriangleList;
}
