/// <summary>
/// Measures the text.
/// </summary>
/// <param name="text">The text.</param>
/// <param name="fontFamily">The font family.</param>
/// <param name="fontSize">Size of the font.</param>
/// <param name="fontWeight">The font weight.</param>
/// <returns>
/// The size of the text.
/// </returns>
public override OxySize MeasureText(string text, string fontFamily, double fontSize, double fontWeight)
{
if (string.IsNullOrEmpty (text) || fontFamily == null) {
return OxySize.Empty;
}
var fontName = GetActualFontName (fontFamily, fontWeight);
var font = this.GetCachedFont (fontName, (float)fontSize);
using (var attributedString = new NSAttributedString (text, new CTStringAttributes {
ForegroundColorFromContext = true,
Font = font
})) {
using (var textLine = new CTLine (attributedString)) {
float lineHeight, delta;
this.GetFontMetrics (font, out lineHeight, out delta);
// the text position must be set to get the correct bounds
this.gctx.TextPosition = new PointF (0, 0);
var bounds = textLine.GetImageBounds (this.gctx);
var width = bounds.Left + bounds.Width;
return new OxySize (width, lineHeight);
}
}
}
public SizeF MeasureString(string textg, Font font, RectangleF rect)
{
// As per documentation
// https://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_text/dq_text.html#//apple_ref/doc/uid/TP30001066-CH213-TPXREF101
//
// * Note * Not sure if we should save off the graphic state, set context transform to identity
// and restore state to do the measurement. Something to be looked into.
// context.TextPosition = rect.Location;
// var startPos = context.TextPosition;
// context.SelectFont ( font.nativeFont.PostScriptName,
// font.SizeInPoints,
// CGTextEncoding.MacRoman);
// context.SetTextDrawingMode(CGTextDrawingMode.Invisible);
//
// context.SetCharacterSpacing(1);
// var textMatrix = CGAffineTransform.MakeScale(1f,-1f);
// context.TextMatrix = textMatrix;
//
// context.ShowTextAtPoint(rect.X, rect.Y, textg, textg.Length);
// var endPos = context.TextPosition;
//
// var measure = new SizeF(endPos.X - startPos.X, font.nativeFont.CapHeightMetric);
var atts = buildAttributedString(textg, font);
// for now just a line not sure if this is going to work
CTLine line = new CTLine(atts);
var lineBounds = line.GetImageBounds(context);
// Create and initialize some values from the bounds.
float ascent;
float descent;
float leading;
double lineWidth = line.GetTypographicBounds(out ascent, out descent, out leading);
var measure = new SizeF((float)lineWidth, ascent + descent);
return measure;
}
/// <summary>
/// Draws the text.
/// </summary>
/// <param name="p">The position of the text.</param>
/// <param name="text">The text.</param>
/// <param name="fill">The fill color.</param>
/// <param name="fontFamily">The font family.</param>
/// <param name="fontSize">Size of the font.</param>
/// <param name="fontWeight">The font weight.</param>
/// <param name="rotate">The rotation angle.</param>
/// <param name="halign">The horizontal alignment.</param>
/// <param name="valign">The vertical alignment.</param>
/// <param name="maxSize">The maximum size of the text.</param>
public override void DrawText(ScreenPoint p, string text, OxyColor fill, string fontFamily, double fontSize, double fontWeight, double rotate, HorizontalAlignment halign, VerticalAlignment valign, OxySize? maxSize)
{
if (string.IsNullOrEmpty (text)) {
return;
}
var fontName = GetActualFontName (fontFamily, fontWeight);
var font = this.GetCachedFont (fontName, fontSize);
using (var attributedString = new NSAttributedString (text, new CTStringAttributes {
ForegroundColorFromContext = true,
Font = font
})) {
using (var textLine = new CTLine (attributedString)) {
float width;
float height;
this.gctx.TextPosition = new PointF (0, 0);
float lineHeight, delta;
this.GetFontMetrics (font, out lineHeight, out delta);
var bounds = textLine.GetImageBounds (this.gctx);
var x0 = 0;
var y0 = delta;
if (maxSize.HasValue || halign != HorizontalAlignment.Left || valign != VerticalAlignment.Bottom) {
width = bounds.Left + bounds.Width;
height = lineHeight;
} else {
width = height = 0f;
}
if (maxSize.HasValue) {
if (width > maxSize.Value.Width) {
width = (float)maxSize.Value.Width;
}
if (height > maxSize.Value.Height) {
height = (float)maxSize.Value.Height;
}
}
var dx = halign == HorizontalAlignment.Left ? 0d : (halign == HorizontalAlignment.Center ? -width * 0.5 : -width);
var dy = valign == VerticalAlignment.Bottom ? 0d : (valign == VerticalAlignment.Middle ? height * 0.5 : height);
this.SetFill (fill);
this.SetAlias (false);
this.gctx.SaveState ();
this.gctx.TranslateCTM ((float)p.X, (float)p.Y);
if (!rotate.Equals (0)) {
this.gctx.RotateCTM ((float)(rotate / 180 * Math.PI));
}
this.gctx.TranslateCTM ((float)dx + x0, (float)dy + y0);
this.gctx.ScaleCTM (1f, -1f);
if (maxSize.HasValue) {
var clipRect = new RectangleF (-x0, y0, (float)Math.Ceiling (width), (float)Math.Ceiling (height));
this.gctx.ClipToRect (clipRect);
}
textLine.Draw (this.gctx);
this.gctx.RestoreState ();
}
}
}
