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c:graphics.h:textwidth

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c:graphics.h:textwidth [2015/05/06 23:06] (current)
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 +===== textwidth =====
 +
 +
 +====Syntax of textwidth ==== 
 + <code c>
 +#include <graphics.h>
 +int textwidth(char *textstring);
 +  </code>
 +
 +
 +==== Description of textwidth ==== 
 +<code c>
 +The graphics function textwidth takes the string length, current font
 +size, and multiplication factor, and determines the width of textstring
 +in pixels.
 +This function is useful for computing viewport widths, sizing a title to
 +make it fit on a graph or in a box, and so on.
 +Use textwidth to compute the width of strings, instead of doing the
 +computations manually. When you use this function, no source code
 +modifications have to be made when different fonts are selected.
 +</code>
 +
 +
 +==== Example of textwidth ====
 +<code c>
 +/* textwidth example */
 +
 +#include <graphics.h>
 +#include <stdlib.h>
 +#include <stdio.h>
 +#include <conio.h>
 +
 +int main(void)
 +{
 +   /* request autodetection */
 +   int gdriver = DETECT, gmode, errorcode;
 +   int x = 0, y = 0;
 +   int i;
 +   char msg[80];
 +
 +   /* initialize graphics and local variables */
 +   initgraph(&gdriver, &gmode, "");
 +
 +   /* read result of initialization */
 +   errorcode = graphresult();
 +   if (errorcode != grOk) {  /* an error occurred */
 +printf("Graphics error: %s\n", grapherrormsg(errorcode));
 +
 +printf("Press any key to halt:");
 +getch();
 +exit(1);   /* terminate with an error code */
 +   }
 +
 +   y = getmaxy() / 2;
 +   settextjustify(LEFT_TEXT, CENTER_TEXT);
 +   for (i = 1; i < 11; i++) {
 +/* select the text style, direction, and size */
 +settextstyle(TRIPLEX_FONT, HORIZ_DIR, i);
 +
 +/* create a message string */
 +sprintf(msg, "Size: %d", i);
 +
 +/* output the message */
 +outtextxy(x, y, msg);
 +
 +/* advance to the end of the text */
 +
 +x += textwidth(msg);
 +   }
 +
 +   /* clean up */
 +   getch();
 +   closegraph();
 +   return 0;
 +}
 +</code>
 +
 +
 +==== See also ====
 +[[gettextsettings]]
 +[[outtext]]
 +[[outtextxy]]
 +[[settextstyle]]
 +[[textheight]]
 +
 +
 +===== output of textwidth example ===== 
 +
 +    no output of example at the moment
 +    do not hesitate and add it...  
 +
 +
  
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c/graphics.h/textwidth.txt · Last modified: 2015/05/06 23:06 (external edit)

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