private void cmdMeasureString_Click(object sender, EventArgs e)
{
//How to measure user's string...
//this demostrate step-by-step
//similar to ... selectedTextPrinter.DrawString(printTextBuffer, x_pos, y_pos);
string str = txtInputChar.Text;
//
Typeface typeface = _basicOptions.Typeface;
float fontSizeInPoints = _basicOptions.FontSizeInPoints;
var layout = new Typography.TextLayout.GlyphLayout();
layout.Typeface = typeface;
layout.ScriptLang = _basicOptions.ScriptLang;
layout.PositionTechnique = _basicOptions.PositionTech;
layout.EnableLigature = false;// true
layout.EnableComposition = true;
//3.
//3.1 : if you want GlyphPlanList too.
//var resultGlyphPlanList = new Typography.TextLayout.GlyphPlanList();
//Typography.TextLayout.MeasuredStringBox box = layout.LayoutAndMeasureString(str.ToCharArray(), 0, str.Length, _basicOptions.FontSizeInPoints, resultGlyphPlanList);
//or
//3.2 : only MeasuredStringBox
Typography.TextLayout.MeasuredStringBox box =
layout.LayoutAndMeasureString(
str.ToCharArray(), 0,
str.Length,
fontSizeInPoints);
this.lblStringSize.Text = "measure (W,H)= (" + box.width.ToString() + "," + (box.AscendingInPx - box.DescendingInPx) + ") px";
}
public static void MeasureString(
this GlyphLayout glyphLayout,
char[] textBuffer,
int startAt,
int len, out MeasuredStringBox strBox, float scale = 1)
{
//TODO: consider extension method
List <GlyphPlan> outputGlyphPlans = glyphLayout._myGlyphPlans;
outputGlyphPlans.Clear();
glyphLayout.Layout(textBuffer, startAt, len, outputGlyphPlans);
//
int j = outputGlyphPlans.Count;
Typeface currentTypeface = glyphLayout.Typeface;
if (j == 0)
{
//not scale
strBox = new MeasuredStringBox(0,
currentTypeface.Ascender * scale,
currentTypeface.Descender * scale,
currentTypeface.LineGap * scale);
}
//get last one
GlyphPlan lastOne = outputGlyphPlans[j - 1];
strBox = new MeasuredStringBox((lastOne.x + lastOne.advX) * scale,
currentTypeface.Ascender * scale,
currentTypeface.Descender * scale,
currentTypeface.LineGap * scale);
}
//static void ConcatMeasureBox(ref float accumW, ref float accumH, ref MeasuredStringBox measureBox)
//{
// accumW += measureBox.width;
// float h = measureBox.CalculateLineHeight();
// if (h > accumH)
// {
// accumH = h;
// }
//}
public static MeasuredStringBox LayoutAndMeasureString(
this GlyphLayout glyphLayout,
char[] textBuffer,
int startAt,
int len,
float fontSizeInPoints,
float limitW = -1,//-1 unlimit scaled width (px)
bool snapToGrid = true)
{
//1. unscale layout, in design unit
glyphLayout.Layout(textBuffer, startAt, len);
//2. scale to specific font size
Typeface typeface = glyphLayout.Typeface;
float pxscale = typeface.CalculateScaleToPixelFromPointSize(fontSizeInPoints);
//....
float scaled_accumX = 0;
if (limitW < 0)
{
//no limit
scaled_accumX = MeasureGlyphPlans(
glyphLayout,
pxscale,
snapToGrid);
return(new MeasuredStringBox(
scaled_accumX,
typeface.Ascender,
typeface.Descender,
typeface.LineGap,
typeface.ClipedAscender,
typeface.ClipedDescender,
pxscale));
}
else if (limitW > 0)
{
scaled_accumX = MeasureGlyphPlanWithLimitWidth(
glyphLayout,
pxscale,
limitW,
snapToGrid,
out int stopAtChar);
var mstrbox = new MeasuredStringBox(
scaled_accumX,
typeface.Ascender,
typeface.Descender,
typeface.LineGap,
typeface.ClipedAscender,
typeface.ClipedDescender,
pxscale);
mstrbox.StopAt = (ushort)stopAtChar;
return(mstrbox);
}
else
{
return(new MeasuredStringBox(
0,
typeface.Ascender,
typeface.Descender,
typeface.LineGap,
typeface.ClipedAscender,
typeface.ClipedDescender,
pxscale));
}
}
