public static ABC GetCharWidthABC(char ch, Font font, System.Drawing.Graphics gr)
{
ABC[] _temp = new ABC[1];
var nativFont = CreateFont (font.Name, font.Size, font.Style, font.GdiCharSet, font.GdiVerticalFont);
var atts = buildAttributedString(ch.ToString(), nativFont);
// for now just a line not sure if this is going to work
CTLine line = new CTLine(atts);
float ascent;
float descent;
float leading;
_temp[0].abcB = (uint)line.GetTypographicBounds(out ascent, out descent, out leading);
return _temp[0];
}
static void PrepareGlyphArcInfo (CTLine line, long glyphCount, GlyphArcInfo[] glyphArcInfo)
{
var runArray = line.GetGlyphRuns ();
// Examine each run in the line, updating glyphOffset to track how far along the run is
// in terms of glyphCount.
long glyphOffset = 0;
float ascent = 0;
float descent = 0;
float leading = 0;
foreach (var run in runArray) {
var runGlyphCount = run.GlyphCount;
// Ask for the width of each glyph in turn.
var runGlyphIndex = 0;
for (; runGlyphIndex < runGlyphCount; runGlyphIndex++) {
glyphArcInfo[runGlyphIndex + glyphOffset].width = (float)run.GetTypographicBounds (new NSRange (runGlyphIndex, 1), out ascent, out descent, out leading);
}
glyphOffset += runGlyphCount;
}
var lineLength = line.GetTypographicBounds (out ascent, out descent, out leading);
var prevHalfWidth = glyphArcInfo[0].width / 2.0;
glyphArcInfo[0].angle = (float)((prevHalfWidth / lineLength) * Math.PI);
var lineGlyphIndex = 1;
for (; lineGlyphIndex < glyphCount; lineGlyphIndex++) {
var halfWidth = glyphArcInfo[lineGlyphIndex].width / 2.0;
var prevCenterToCenter = prevHalfWidth + halfWidth;
glyphArcInfo[lineGlyphIndex].angle = (float)((prevCenterToCenter / lineLength) * Math.PI);
prevHalfWidth = halfWidth;
}
}
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;
}
internal static CCSize MeasureString (string textg, CTFont font, CCRect rect)
{
var atts = buildAttributedString(textg, font);
// for now just a line not sure if this is going to work
CTLine line = new CTLine(atts);
// Create and initialize some values from the bounds.
nfloat ascent;
nfloat descent;
nfloat leading;
double lineWidth = line.GetTypographicBounds(out ascent, out descent, out leading);
var measure = new CCSize((float)(lineWidth + leading), (float)(ascent + descent));
return measure;
}
// This only handles one character for right now
internal static void GetCharABCWidthsFloat (char characters, CTFont font, out ABCFloat[] abc)
{
var atts = buildAttributedString(characters.ToString(), font);
// for now just a line not sure if this is going to work
CTLine line = new CTLine(atts);
nfloat ascent;
nfloat descent;
nfloat leading;
abc = new ABCFloat[1];
abc[0].abcfB = (float)line.GetTypographicBounds(out ascent, out descent, out leading);
abc [0].abcfB += (float)leading;
}
public override double GetBaseline (object backend)
{
LayoutInfo li = (LayoutInfo)backend;
using (var line = new CTLine (CreateAttributedString (li))) {
nfloat ascent, descent, leading;
line.GetTypographicBounds (out ascent, out descent, out leading);
return (double)ascent;
}
}
