/// <summary>
/// See base docs.
/// </summary>
/// <param name="drawing"></param>
/// <param name="font"></param>
/// <param name="text"></param>
/// <param name="width"></param>
/// <param name="height"></param>
protected override void MeasureText(VrsDrawing.IDrawing drawing, VrsDrawing.IFont font, string text, out float width, out float height)
{
width = 0F;
height = 0F;
if (drawing is Drawing context && font is FontWrapper fontWrapper)
{
var size = context.NativeDrawingContext.MeasureString(
text,
fontWrapper.NativeFont,
new PointF(0, 0),
StringFormat.GenericTypographic
);
width = size.Width;
height = size.Height;
}
}
/// <summary>
/// See interface docs.
/// </summary>
/// <param name="drawing"></param>
/// <param name="fontFamily"></param>
/// <param name="fontStyle"></param>
/// <param name="largestPointSize"></param>
/// <param name="smallestPointSize"></param>
/// <param name="constrainToWidth"></param>
/// <param name="constrainToHeight"></param>
/// <param name="text"></param>
/// <param name="useCache"></param>
/// <returns></returns>
public VrsDrawing.FontAndText GetFontForRectangle(VrsDrawing.IDrawing drawing, VrsDrawing.IFontFamily fontFamily, VrsDrawing.FontStyle fontStyle, float largestPointSize, float smallestPointSize, float constrainToWidth, float constrainToHeight, string text, bool useCache)
{
var textBuffer = new StringBuilder(text);
var pointSize = largestPointSize;
bool trySmaller;
VrsDrawing.IFont font;
do
{
font = CreateFont(fontFamily, pointSize, fontStyle, useCache);
MeasureText(drawing, font, textBuffer.ToString(), out var width, out var height);
trySmaller = width > constrainToWidth || height > constrainToHeight;
if (trySmaller)
{
if (pointSize > smallestPointSize)
{
pointSize = Math.Max(smallestPointSize, pointSize - 0.25F);
}
else
{
if (textBuffer.Length == 0 || ImageLibraryDrawTextWillTruncate)
{
trySmaller = false;
}
else
{
textBuffer.Remove(textBuffer.Length - 1, 1);
}
}
}
} while(trySmaller);
return(new VrsDrawing.FontAndText(font, text.ToString()));
}
/// <summary> /// Measures a string given a font and a drawing context. /// </summary> /// <param name="drawing"></param> /// <param name="font"></param> /// <param name="text"></param> /// <param name="width"></param> /// <param name="height"></param> protected abstract void MeasureText(VrsDrawing.IDrawing drawing, VrsDrawing.IFont font, string text, out float width, out float height);