cgraphics: C Program to explain function setusercharsize()

Graphics in C-Scaling of text size using function setusercharsize()

Here is a simple program to describe one more text setting function. Please type this program in your editor.

#include<graphics.h>

void main()

{

int gd = DETECT, gm;

initgraph(&gd, &gm, "c:\\tc\\bgi");

/* Default font, normal(default) size */

outtextxy(0,100, "Hello World");

/* set stroked triplex font */

settextstyle(TRIPLEX_FONT, HORIZ_DIR, 0);

/* text display in normal(default) size */

outtextxy(0, 120, "Hello World");

/* default text width scaled by 2:1, and

height scaled by 3:2 */

setusercharsize(2, 1, 3, 2);

outtextxy(0, 150, "Hello World");

/* default text width scaled by 3:1, and

height scaled by 2:1 */

setusercharsize(3, 1, 2, 1);

outtextxy(0, 200, "Hello World");

getch();

closegraph();

restorecrtmode();

}

Compile and execute this program. The output would be a “Hello World” message in different sizes.

For changing the size I have used the function setusercharsize(). Function setusercharsize() uses a user-defined character magnification factor for stroked fonts. With function setusercharsize() you specify the factors by which the width and height are scaled.

Declaration:

void far setusercharsize(int multx, int divx, int multy, int divy);

Syntax for calling this function is:

setusercharsize(multx, divx, multy, divy);

where multx : divx is the scaling ratio for text width, and multy : divy is the scaling ratio for height. It means the default width is scaled by multx : divx, and the default height is scaled by multy : divy.

Suppose you want to make the text width double of the normal size, you should set multx = 2, divx = 1 (2 : 1), and text height triple of the normal size, the values of multy, and divy would be ‘3’, and ‘1’ (3 : 1).

Function setusercharsize() can be used only for stroked fonts.

In the given program, I have displayed a string in the default font and size.

outtextxy(0,100, "Hello World");

Then I have set the font style as ‘triplex font’ by function settextstyle() , since function setusercharsize() can be used on stroked fonts only(triplex font is a stroked font. Enumerated values 1 to 10 are stroked font styles. Triplex font has enumerated value ‘1’).

settextstyle(TRIPLEX_FONT, HORIZ_DIR, 0);

In this statement, I have set charsize = 0, it is because of the fact that values set by function setusercharsize() are effective only if you set charsize to ‘0’ by a previous call to function settextstyle().

The statements:

setusercharsize(2, 1, 3, 2);

outtextxy(0, 150, "Hello World");

display the text string “Hello World” in the size, default width scaled by the factor (2 : 1), twice as wide as default width, and default height scaled by the ratio (3 : 2), 50% taller than the default height.

The statements:

setusercharsize(3, 1, 2, 1);

outtextxy(0, 200, "Hello World");

can also be explained the same way.

Therefore, the explanation of this simple function setusercharsize() is complete. For the explanation of the remaining functions and terms, please refer my previous posts.

OUTPUT: