internal void DrawString(SpriteFont font, string text, ref SpriteFont.InternalUIDrawCommand drawCommand)
{
if (font == null)
{
throw new ArgumentNullException("font");
}
if (text == null)
{
throw new ArgumentNullException("text");
}
var proxy = new SpriteFont.StringProxy(text);
// shift the string position so that it is written from the left/top corner of the element
var offsets = drawCommand.Size / 2;
var worldMatrix = drawCommand.Matrix;
worldMatrix.M41 -= worldMatrix.M11 * offsets.X + worldMatrix.M21 * offsets.Y;
worldMatrix.M42 -= worldMatrix.M12 * offsets.X + worldMatrix.M22 * offsets.Y;
worldMatrix.M43 -= worldMatrix.M13 * offsets.X + worldMatrix.M23 * offsets.Y;
// transform the world matrix into the world view project matrix
Matrix.MultiplyTo(ref worldMatrix, ref viewProjectionMatrix, out drawCommand.Matrix);
// do not snap static fonts when real/virtual resolution does not match.
if (!font.IsDynamic && (drawCommand.FontScale.X != 1 || drawCommand.FontScale.Y != 1))
{
drawCommand.SnapText = false; // we don't want snapping of the resolution of the screen does not match virtual resolution. (character alignment problems)
drawCommand.FontScale = Vector2.One; // ensure that static font are not scaled internally
}
// snap draw start position to prevent characters to be drawn in between two pixels
if (drawCommand.SnapText)
{
var invW = 1.0f / drawCommand.Matrix.M44;
var backBufferHalfWidth = GraphicsDevice.BackBuffer.ViewWidth / 2;
var backBufferHalfHeight = GraphicsDevice.BackBuffer.ViewHeight / 2;
drawCommand.Matrix.M41 *= invW;
drawCommand.Matrix.M42 *= invW;
drawCommand.Matrix.M41 = (float)(Math.Round(drawCommand.Matrix.M41 * backBufferHalfWidth) / backBufferHalfWidth);
drawCommand.Matrix.M42 = (float)(Math.Round(drawCommand.Matrix.M42 * backBufferHalfHeight) / backBufferHalfHeight);
drawCommand.Matrix.M41 /= invW;
drawCommand.Matrix.M42 /= invW;
}
font.InternalUIDraw(ref proxy, ref drawCommand);
}
/// <summary>
/// Batch the draws required to display the provided text to the draw list.
/// </summary>
/// <param name="fontSize">The size to use when rendering the font</param>
/// <param name="fontInternalScale">The size of the font glyphs to use in pixels</param>
/// <param name="text">The text to draw on the screen</param>
/// <param name="worldMatrix">The world matrix of the element</param>
/// <param name="elementSize">The 2D size of the element to draw in virtual pixels</param>
/// <param name="color">The color of the text to draw</param>
/// <param name="alignment">The alignment of the text to draw</param>
/// <param name="depthBias">The depth bias of the ui element</param>
/// <param name="font">The fond to use to draw the text</param>
/// <param name="snapText">Indicate if the rendered string should be snapped to the closed pixel.</param>
public void DrawString(SpriteFont font, string text, float fontSize, ref Vector2 fontInternalScale, ref Matrix worldMatrix, ref Vector2 elementSize,
ref Color color, TextAlignment alignment, int depthBias, bool snapText)
{
var drawCommand = new SpriteFont.InternalUIDrawCommand
{
WorldMatrix = worldMatrix,
Batch = this,
Color = color,
DepthBias = depthBias,
FontScale = fontInternalScale,
SnapText = snapText,
Alignment = alignment,
Size = elementSize,
};
DrawString(font, text, ref drawCommand);
}
internal void DrawString(SpriteFont font, string text, ref SpriteFont.InternalUIDrawCommand drawCommand)
{
if (font == null)
{
throw new ArgumentNullException("font");
}
if (text == null)
{
throw new ArgumentNullException("text");
}
var proxy = new SpriteFont.StringProxy(text);
// shift the string position so that it is written from the left/top corner of the element
var offsets = drawCommand.Size / 2;
drawCommand.WorldMatrix.M41 -= drawCommand.WorldMatrix.M11 * offsets.X + drawCommand.WorldMatrix.M21 * offsets.Y;
drawCommand.WorldMatrix.M42 -= drawCommand.WorldMatrix.M12 * offsets.X + drawCommand.WorldMatrix.M22 * offsets.Y;
drawCommand.WorldMatrix.M43 -= drawCommand.WorldMatrix.M13 * offsets.X + drawCommand.WorldMatrix.M23 * offsets.Y;
font.InternalUIDraw(ref proxy, ref drawCommand);
}