Java Development

[MSohm]

Quote from the previous forum:

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Guest	Font scaling/translating Posted: Jul 21, 2008 11:01 AM
	I am trying to use the following API for constructing a new font: public Font derive(int style, int height, int units, int antialiasMode, int effects, int[] transform) I am trying to use the transform to do scaling of 2/3 and translation of 1/2. Does any body has an example on how to express those values using the 3x2 matrix to define the transform? Thanks

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Please note that this method will attempt to return an existing system font that matches your criteria.  If no match is found, the current font is returned.

[bzubert]

The javadoc for the Font class indicates the transformation matrix for scaling should take the form:

       sx 0 0
       0 sy 0
       0 0 1

Translating that 3x3 matrix to a form useful for this method generates the following matrix:

int[] transform = new int[] { sx, 0, sy, 0, 0, 0 };

[rab]

This is how I am using it, but I do not see any effect:

 String strText ="Centered Rich TEXT, multiple fonts"; 

  Font fonts[] = new Font[5];
         
        int one = Fixed32.toFP(1);             
        int two = Fixed32.toFP(2);
        int  n = one/2;
        int  m = two/3 ;
                     
        fonts[0] = Font.getDefault();
        fonts[1] = Font.getDefault().derive(Font.BOLD,10,Ui.UNITS_px);
        fonts[2] = Font.getDefault().derive(Font.BOLD | Font.ITALIC,30);
        fonts[3] = Font.getDefault().derive(Font.PLAIN,10,Ui.UNITS_px);
 

        int[] transform = new int[] { one,0,0,one,n,n };

        fonts[4] = Font.getDefault().derive(Font.PLAIN,10,Ui.UNITS_px,1,0,transform);
                        
        int offset[] = new int[5];
        byte attributes[] = new byte[4];
       

        attributes[0] = 1;//bold
        attributes[1] = 3; //Plain, 10
        attributes[2] = 4; //translated
        attributes[3] = 2; //bold italic 30
      
        offset[0] = 0;
        offset[1] = 9;
        offset[2] = 13;
        offset[3] = 18;
        offset[4] = strText.length();
       

 RichTextField   rtf = new RichTextField(strText,offset,attributes,fonts, RichTextField.TEXT_ALIGN_HCENTER|RichTextField.NON_FOCUSABLE);
       

 .... etc..

I would expect the word "TEXT" to display at some offset compared to the rest of the text.

The idea here is to use the transform to translate by 1/2 and scale by 2/3. This transformation will display the text as superscript. In the example above I am not scaling as this may not find the font and the derive will return the default one. So I am doing just the translation which ( according to my undestanding ) should work all the time.

So where did I go wrong? Can you please help?

Thanks

[rab]

Any suggestion?

Thanks

[rab]

I kept testing the font scaling and translating, and I got it working when I draw my own text in the paint method, but when I use the same thing within a RichTextField, it does not work.

Here is the code that I am using :

String strText ="Test of gp superscript and subscript"; 
        Font fonts[] = new Font[3];
        
                       
        fonts[0] = Font.getDefault().derive(Font.BOLD,20,Ui.UNITS_px);
        int style = fonts[0].getStyle();
        int size  = fonts[0].getHeight();
        int one = Fixed32.toFP(1);              
        int two = Fixed32.toFP(2);
        int  ny = Fixed32.toFP(fonts[0].getHeight()/2);
        int  m = two/3 ;
                           
        int[] transform  = new int[] { m,0,0,m,0,-one }; 
        int[] transform1 = new int[] { m,0,0,m,0,ny }; 
        
        fonts[1] = Font.getDefault().derive(style,size,Ui.UNITS_px,1,0x2,transform);
        fonts[2] = Font.getDefault().derive(style,size,Ui.UNITS_px,1,0x2,transform1);
      
                         
        int offset[] = new int[5];
        
        byte attributes[] = new byte[4];
        attributes[0] = 0;//bold 
        attributes[1] = 1; //superscript
        attributes[2] = 0; //bold
        attributes[3] = 0; //subscript
       
        offset[0] = 0;
        offset[1] = 10;
        offset[2] = 21;
        offset[3] = 26;
        offset[4] = strText.length();
     
             
       RichTextField   rtf = new RichTextField(strText,offset,attributes,fonts, RichTextField.NON_FOCUSABLE);

The same code/fonts work fine if I draw the text in the paint method of a custom field.

Does any one know why is this not working?

Thanks

[MSohm]

This is the expected behaviour.  Font translations, transformations and rotations are not supported in TextFields (and Fields derrived from it).  They are supported when drawing directly to a Graphics object.

Message Edited by MSohm on 07-25-2008 01:15 PM