private void DrawDebugBox(Graphics graphics, TextBoxInfo info)
{
graphics.DrawRectangle(
new Pen(Color.Blue, 1),
this.padding.Width, this.padding.Height,
this.RealEstateSize().Width, this.RealEstateSize().Height
);
graphics.DrawRectangle(
new Pen(Color.Red, 1),
(this.size.Width - info.trueBox.Width) / 2, (this.size.Height - info.trueBox.Height) / 2,
info.trueBox.Width, info.trueBox.Height
);
}
private PointF TextPosition(TextBoxInfo info)
{
return new PointF(
- info.trueBox.Left + (this.size.Width - info.trueBox.Width) / 2,
- info.trueBox.Top + (this.size.Height - info.trueBox.Height) / 2
);
}
/*
* Find an optimal font size for text to fit in the given box.
*/
public static TextBoxInfo FitTextSize(
Graphics graphic, String textToFit, SizeF boxSize, String fontName,
FontStyle fontStyle, StringFormat format,
float guessSize = 16, float step=0.05f)
{
var fontTry = GetFont(fontName, guessSize, fontStyle);
/* Initial measure */
SizeF measuredSize = MeasureString(graphic, textToFit, fontTry, format);
float currentWidth = measuredSize.Width;
float currentHeight = measuredSize.Height;
float desiredWidth = boxSize.Width;
float desiredHeight = boxSize.Height;
/* Estimate size */
float estimatedFontSize = Math.Min(
currentWidth * (desiredWidth / currentWidth),
currentHeight * (desiredHeight / currentHeight)
);
/* Refine size */
float refinedSize = estimatedFontSize;
while (refinedSize > 1)
{
fontTry = GetFont(fontName, refinedSize, fontStyle);
measuredSize = MeasureString(graphic, textToFit, fontTry, format);
if (measuredSize.Width <= desiredWidth && measuredSize.Height <= desiredHeight)
break;
refinedSize -= step;
}
var textBoxInfo = new TextBoxInfo(
textToFit,
GetFont(fontName, refinedSize, fontStyle),
refinedSize,
MeasureRealStringBoundaries(graphic, textToFit, fontTry, format)
);
return textBoxInfo;
}