Character width

[rm_titus]

Hello guys,

 

In the "Drafting Options" dialog, under the

option "Dimension Text" there is a textbox called "Character width".

 

Is that value saved or not in the database?

Do you know of a way to retrieve that value?

 

Thanks a lot!

--Titus

[Roger Martin from CNC Software]

‘Character Width’ is only active with ‘Spacing’ is set to ‘Fixed’.

 

I cannot say for sure without further digging, but I’d assume that data is stored in the font_attr structure.

 

The Drafting stuff is declared in DfVars_CH.h.

 

Now type depending on what you’re dealing with; a Note (v8_note) or Dimension (v8_dim_txt)…

Each of those types contains a font_attr structure.

So you drill down thru the ‘ent’…

For a ‘note’: ent.u.n.params [data item in font_attr]

For a ‘dimension’: ent.u.dm.n.params [data item in font_attr]

To find which [data item in font_attr], I would plug in some unique value for that setting and then look at (in the debugger) what's loaded in the font_attr struct for that ent.

[rm_titus]

Thanks Roger!

 

I'm working with Notes (v8_note).

The structure font_attr is defined

 

code:

---

typedef struct

{

p_2d center; /**< center point of arc */

double str_rot; /**< string rotation angle */

double slant; /**< slant angle */

double chr_rot; /**< character rotation angle */

double height; /**< height of character */

double chr_exp; /**< character expansion factor(based on height)*/

double extra_sp; /**< extra char. space facter per unit of height*/

double extra_ln_sp; /**< extra line space factor */

double alt_height; /**< height of character */

double alt_chr_exp; /**< alt char. expansion factor(based on height)*/

/* 2 bytes */

unsigned short alt_color:4; /**< draw color */

unsigned short fill_color:4; /**< fill color */

unsigned short h_txt_aln:2; /**< hort. align.(0-left,1-center,2-right)*/

unsigned short v_txt_aln:3; /**< vert. align.(0-top,1-cap,2-half,3-base,

4-bottom) */

unsigned short path:3; /**< text path (0-right,1-left,2-up,3-down,

4-arc CW, 5-arc CCW); */

/* 2 bytes */

unsigned short space_sty:1; /**< spacing style(0-fixed,1-proportional)*/

unsigned short fill:1; /**< fill region flag */

unsigned short mirror:2; /**< mirror flag (0-no mirror, 1-mirror x,

2-mirrory,3- mirror both)*/

unsigned short filler:12; /**< not used at present, here for alignment */

/* 4 bytes */

MC_BYTE font; /**< display font */

MC_BYTE alt_font; /**< alternate display font */

MC_BYTE text_bx; /**< text box draw flag for top */

MC_BYTE pad; /**< Pad end of structure */

} font_attr;

---

The 'Character Width' must be one of those elements but don't know which one.

 

--Titus

[Roger Martin from CNC Software]

Note in the Drafting Options dialog the interplay between the Aspect Ratio and the Character Width.

 

*When the Spacing Mode is ‘Fixed’ ->

The Aspect Ratio field is grayed-out and Character Width is active.

Notice when you change the Character Width that the value of Aspect Ratio changes.

 

*When the Spacing Mode is ‘Proportional’ ->

The Character Width field is grayed-out and is Aspect Ratio active.

Notice when you change the Aspect Ratio that the value of Character Width changes.

 

So you see that these 2 settings (on the dialog ) are ‘linked’.

Some experimentation shows us that the ‘link’ is -> Aspect Ratio = width/height.

 

With…

Width = Character Width

Height = Text Height

 

*In the end we see that Character Width is not stored and it is the Aspect Ratio value is that gets written to the font_attr struct data in chr_exp.

[rm_titus]

Thanks a lot Roger!

Very clear and detailed explanations.