internal void Draw(PrimitiveBatch primitiveBatch, string text, Vector2 position, Color color, float spacing, float lineHeight, float scale, TextRotation rotation = TextRotation.None)
{
StringProvider provider = new StringProvider(text);
_colors[0] = color;
DrawInternal(primitiveBatch, provider, position, _colors, 1, spacing, lineHeight, scale, rotation);
}
Vector2 MeasureInternal(StringProvider text, float spacing, float lineHeight)
{
int count = text.Length;
char previousChar = '\0';
Vector2 position = Vector2.Zero;
Vector2 size = Vector2.Zero;
spacing = (float)Height * spacing;
for (int idx = 0; idx < count; ++idx)
{
char character = text[idx];
Glyph glyph = Find(character);
if (glyph != null)
{
if (previousChar != '\0')
{
float kerning = (float)glyph.Kerning(previousChar) / 10f;
position.X += kerning;
position.X += spacing;
}
previousChar = character;
position.X += glyph.Width;
size.X = Math.Max(size.X, position.X);
size.Y = position.Y + BaseLine - CapLine;
}
else if (text[idx] == '\n')
{
position.X = 0;
position.Y += Height * lineHeight;
previousChar = '\0';
}
}
return(size);
}
void DrawInternal(PrimitiveBatch primitiveBatch, StringProvider text, Vector2 targetPosition, Color[] colors, float opacity, float spacing, float lineHeight, float scale, TextRotation rotation)
{
if (primitiveBatch.PrimitiveType != PrimitiveType.TriangleList)
{
throw new Exception("PrimitiveBatch has to be started with TriangleList primitive type.");
}
Vector2 right = new Vector2(1, 0);
Vector2 down = new Vector2(0, 1);
switch (rotation)
{
case TextRotation.Rotate180:
right = new Vector2(-1, 0);
down = new Vector2(0, -1);
break;
case TextRotation.Rotate270:
right = new Vector2(0, 1);
down = new Vector2(-1, 0);
break;
case TextRotation.Rotate90:
right = new Vector2(0, -1);
down = new Vector2(1, 0);
break;
}
int count = text.Length;
char previousChar = '\0';
spacing = (float)Height * spacing * scale;
Vector2 position = targetPosition;
Color color;
for (int idx = 0; idx < count; ++idx)
{
char character = text[idx];
Glyph glyph = Find(character);
if (glyph != null)
{
if (previousChar != '\0')
{
float kerning = (float)glyph.Kerning(previousChar) / 10f;
position += right * (kerning * scale + spacing);
}
previousChar = character;
Vector2 pos = position + down * (scale * (glyph.Top - CapLine));
color = colors[idx % colors.Length] * opacity;
DrawGlyph(primitiveBatch, glyph, ref pos, ref color, scale, ref right, ref down);
position += right * (glyph.Width * scale);
}
else if (text[idx] == '\n')
{
if (rotation == TextRotation.Rotate270 || rotation == TextRotation.Rotate90)
{
position.Y = targetPosition.Y;
}
else
{
position.X = targetPosition.X;
}
position += down * (lineHeight * Height * scale);
previousChar = '\0';
}
}
}
public Vector2 MeasureString(string text, float spacing, float lineHeight)
{
StringProvider provider = new StringProvider(text);
return(MeasureInternal(provider, spacing, lineHeight));
}
internal void Draw(PrimitiveBatch primitiveBatch, StringBuilder text, Vector2 position, Color[] colors, float opacity, float spacing, float lineHeight, float scale, TextRotation rotation = TextRotation.None)
{
StringProvider provider = new StringProvider(text);
DrawInternal(primitiveBatch, provider, position, colors, opacity, spacing, lineHeight, scale, rotation);
}