Welcome Guest! You need to login or register to make posts.

Notification

Icon
Error

Options
Go to last post Go to first unread
enicolasgomez  
#1 Posted : Wednesday, November 19, 2014 6:49:21 AM(UTC)
enicolasgomez

Rank: Member

Groups: Member
Joined: 11/19/2014(UTC)
Posts: 10

Thanks: 4 times
Using PdfWriter to produce some text with effects, like BridgeText. My problem is Pdf's page size is defined before the text being produced so I don't know at that time of how large text is:

Code:
            Text lText;

            using (var lPdfWriter = new PdfWriter(Location.Temp() + aFileName + Extensions.PDF))
            using (var lGraphics = lPdfWriter.GetGraphics())
            {
                lPdfWriter.AddPage(500, 500);
                {
                    var lFont = lGraphics.CreateFont(aFont, aFontSize);
                    var lBrush = new SolidBrush(aColor);
                            lText = new PlainText(aText, lFont, lBrush)
                            {
                                Position = new System.Drawing.PointF(150f, 50f)
                            };
                    lGraphics.DrawText(lText);
                }
            }

So I was wondering if I could create the text before, adding the page to PdfWriter, CreateFont() depends on PdfWriter's GetGraphics so not sure how to do this.

Also, is GetBlackBox() the right interface for getting the font's dimensions in order to pass them to AddPage() method?
Fedor  
#2 Posted : Wednesday, November 19, 2014 9:22:15 AM(UTC)
Fedor

Rank: Advanced Member

Groups: Member, Administration, Moderator
Joined: 7/28/2003(UTC)
Posts: 1,558

Thanks: 5 times
Was thanked: 62 time(s) in 61 post(s)
You can create a bitmap of the size 1x1 pixel with the same DPI as the PDF document and obtain the instance of AdvancedGraphics from the bitmap. Then you need to use the method GetBlackBox to measure the text size and pass it to the PdfWriter. Here is a full code:


Code:
var aFont = "Arial";
var aFontSize = 24f;
var aText = "Graphics Mill by Aurigma";
var aColor = System.Drawing.Color.Blue;

System.Drawing.RectangleF blackBox;

var dpi = 150f;
using (var bitmap = new Bitmap(1, 1, PixelFormat.Format24bppRgb))
{
	bitmap.DpiX = dpi; 
	bitmap.DpiY = dpi;
	using (var lGraphics = bitmap.GetAdvancedGraphics())
	{
		var lFont = lGraphics.CreateFont(aFont, aFontSize);
		var lBrush = new SolidBrush(aColor);
		var lText = new PlainText(aText, lFont, lBrush);
		lText.Position = new System.Drawing.PointF(0f, 0f);
		blackBox = lText.GetBlackBox();
	}
}


using (var lPdfWriter = new PdfWriter(@"c:\eps\out.pdf"))
using (var lGraphics = lPdfWriter.GetGraphics())
{
	lPdfWriter.AddPage((int)Math.Ceiling(blackBox.Width), (int)Math.Ceiling(blackBox.Height), dpi, dpi);
	{
		var lFont = lGraphics.CreateFont(aFont, aFontSize);
		var lBrush = new SolidBrush(aColor);
		var lText = new PlainText(aText, lFont, lBrush)
		{
			Position = new System.Drawing.PointF(0, - blackBox.Y)
		};
		lGraphics.DrawText(lText);
	}
}
Best regards,
Fedor Skvortsov
thanks 1 user thanked Fedor for this useful post.
enicolasgomez on 11/19/2014(UTC)
enicolasgomez  
#3 Posted : Wednesday, November 19, 2014 10:41:18 AM(UTC)
enicolasgomez

Rank: Member

Groups: Member
Joined: 11/19/2014(UTC)
Posts: 10

Thanks: 4 times
Thank you, that helped a lot! One more thing with regard to this issue. After generating the PDF it's being converted to SVG and then loaded by FabricJS into Canvas; looks like there's an offset between the real object and the bounding box:

Offset

Any ideas on this issue? Does it have to do with setting Position to 0f, 0f?
enicolasgomez  
#4 Posted : Thursday, November 20, 2014 6:25:06 AM(UTC)
enicolasgomez

Rank: Member

Groups: Member
Joined: 11/19/2014(UTC)
Posts: 10

Thanks: 4 times
So I fixed the bounding box alignment issue by setting Text object position programatically after it was created, in the following way:

Code:
                            
BridgeText lBridgeText = new BridgeText(aText, lFont, lBrush)
{
    Center = new System.Drawing.PointF(0f, 0f),
    Bend = 0.2f
};
lBridgeText.Center = new System.Drawing.PointF(lBridgeText.GetBlackBox().Width / 2, lBridgeText.GetBlackBox().Height / 2);


However, PlainText() class does not contain a Center property so I was not able to fix the issue for this type of Text. Any ideas?
enicolasgomez  
#5 Posted : Thursday, November 20, 2014 6:34:50 AM(UTC)
enicolasgomez

Rank: Member

Groups: Member
Joined: 11/19/2014(UTC)
Posts: 10

Thanks: 4 times
Fixed for PlainText in the following way, not sure why Position differs from Center but this is how it works (Bruteforced it):

Code:
PlainText lPlainText = new PlainText(aText, lFont, lBrush)
{
     Position = new System.Drawing.PointF(0f, 0f)
};
lPlainText.Position = new System.Drawing.PointF(0f, lPlainText.GetBlackBox().Height);
Users browsing this topic
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.