/// <summary>
/// See interface docs.
/// </summary>
/// <param name="fontFamily"></param>
/// <param name="pointSize"></param>
/// <param name="fontStyle"></param>
/// <param name="useCache"></param>
/// <returns></returns>
public VrsDrawing.IFont CreateFont(VrsDrawing.IFontFamily fontFamily, float pointSize, VrsDrawing.FontStyle fontStyle, bool useCache)
{
if (!useCache)
{
return(CreateFontWrapper(fontFamily, pointSize, fontStyle, isCached: false));
}
else
{
return(GetOrCreateCachedFont(fontFamily, pointSize, fontStyle));
}
}
/// <summary>
/// Static initialisation.
/// </summary>
static ImageWrapper()
{
_FontFactory = Factory.ResolveSingleton <VrsDrawing.IFontFactory>();
_PinTextFontFamily = _FontFactory.GetFontFamilyOrFallback(
_PinTextFontStyle,
"Droid Sans",
"MS Sans Serif",
"Microsoft Sans Serif",
"MS Reference Sans Serif",
"Verdana",
"Tahoma",
"Roboto",
"Helvetica",
"Sans Serif",
"Sans"
);
}
/// <summary>
/// See base docs.
/// </summary>
/// <param name="fontFamily"></param>
/// <param name="pointSize"></param>
/// <param name="fontStyle"></param>
/// <param name="isCached"></param>
/// <returns></returns>
protected override VrsDrawing.IFont CreateFontWrapper(VrsDrawing.IFontFamily fontFamily, float pointSize, VrsDrawing.FontStyle fontStyle, bool isCached)
{
VrsDrawing.IFont result = null;
if (fontFamily is FontFamilyWrapper fontFamilyWrapper)
{
result = new FontWrapper(
new Font(
fontFamilyWrapper.NativeFontFamily,
pointSize,
Convert.ToSystemDrawingFontStyle(fontStyle),
GraphicsUnit.Point
),
isCached
);
}
return(result);
}
/// <summary>
/// Returns a font out of the cache or, if no such font exists, creates and caches a new font for the
/// properties passed across.
/// </summary>
/// <param name="fontFamily"></param>
/// <param name="pointSize"></param>
/// <param name="fontStyle"></param>
/// <returns></returns>
private VrsDrawing.IFont GetOrCreateCachedFont(VrsDrawing.IFontFamily fontFamily, float pointSize, VrsDrawing.FontStyle fontStyle)
{
var key = new FontKey(fontFamily.Name, pointSize, fontStyle);
var map = _FontCache;
if (!map.TryGetValue(key, out var font))
{
lock (_SyncLock) {
if (!_FontCache.TryGetValue(key, out font))
{
font = CreateFontWrapper(fontFamily, pointSize, fontStyle, isCached: true);
map = CollectionHelper.ShallowCopy(_FontCache);
map.Add(key, font);
_FontCache = map;
}
}
}
return(font);
}
/// <summary>
/// See interface docs.
/// </summary>
/// <param name="fontStyle"></param>
/// <param name="fontFamilyNames"></param>
/// <returns></returns>
public VrsDrawing.IFontFamily GetFontFamilyOrFallback(VrsDrawing.FontStyle fontStyle, params string[] fontFamilyNames)
{
VrsDrawing.IFontFamily result = null;
var installedFontFamilies = GetInstalledFonts().ToArray();
try {
foreach (var familyName in fontFamilyNames)
{
result = installedFontFamilies.FirstOrDefault(r =>
String.Equals(familyName, r.Name, StringComparison.OrdinalIgnoreCase) &&
r.AvailableStyles.Contains(fontStyle)
);
if (result != null)
{
break;
}
}
if (result == null)
{
result = installedFontFamilies.FirstOrDefault(r => r.AvailableStyles.Contains(fontStyle));
}
if (result == null)
{
result = installedFontFamilies.FirstOrDefault();
}
} finally {
foreach (var unusedFontFamily in installedFontFamilies.Where(r => !Object.ReferenceEquals(r, result)))
{
unusedFontFamily.Dispose();
}
}
return(result);
}
/// <summary> /// Creates a new instance of a font wrapper. /// </summary> /// <param name="fontFamily"></param> /// <param name="pointSize"></param> /// <param name="fontStyle"></param> /// <param name="isCached"></param> /// <returns></returns> protected abstract VrsDrawing.IFont CreateFontWrapper(VrsDrawing.IFontFamily fontFamily, float pointSize, VrsDrawing.FontStyle fontStyle, bool isCached);
/// <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()));
}