How can I center text in a rectangle?

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Hi. I'm currently struggling trying to find a formula for centering a text based on any coordinates of a rectangle (not just a fixed set). I'm currently using this libraries (as I am restricted by the project):

#include <iostream>
#include <cstring>
#include <fstream>
#include <graphics.h>
#include <winbgim.h>

What I have tried:

I tried different methods, mostly tring to find some fixed variabiles for some fixed coordinates (such as rectangle(x1+98, x2+91, x3+98, x4+13), etc.). Also, I tried using the textwidth function (x1/2-textwidth/2) but I couldn't find a method.

Posted 15-Jan-18 1:33am

Member 13623637

Updated 15-Jan-18 1:51am

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Jochen Arndt · Accepted Answer · 2018-01-15T01:47:00

You have to determine the size of the text in pixels and calculate the top and left positions for centering in a given rectangle:

C++

int text_w = textwidth(textstring);
int text_h = textheight(textstring);
int rect_w = rect_right - rect_left;
int rect_h = rect_bottom - rect_top;
int x = rect_left + (rect_w - text_w) / 2;
int y = rect_top + (rect_h - text_h) / 2;
rectangle(rect_left, rect_top, rect_right, rect_bottom);
outtextxy(x, y, textstring);

CPallini · Accepted Answer · 2018-01-15T01:51:00

Solution 2

Of course textwidth (as well as textheight) is the way to go. If W is the rectangle width and w is the text width the text should be placed at x = X + (W-w)/2 (where X is the rectangle horizontal position and x is the text horizontal position).
There could be some additional offset, but you should be able to determine it experimentally.

Posted 15-Jan-18 1:51am

CPallini

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Member 13623637 15-Jan-18 8:22am

int gd = DETECT, gm;
    initgraph(&gd, &gm, NULL);
    int rect_left = 123, rect_top = 17 , rect_right = 183 , rect_bottom = 37 ;
    int text_w = textwidth("FII");
    int text_h = textheight("FII");
    int rect_w = rect_right - rect_left;
    int rect_h = rect_bottom - rect_top;
    int x = (rect_w - text_w) / 2;
    int y = (rect_h - text_h) / 2;
    rectangle(rect_left, rect_top, rect_right, rect_bottom);
    outtextxy(x, y, "FII");
    getch();
    closegraph();

So I tried Jochen Arndt code and this shows up: image. Also tried adding

x = rect_w + ((rect_w - text_w) / 2)

but all it does is getting closer to the rectangle: image

Also, CPallini, how can I find out the horizontal position? Is it an operation between the rect_top and rect_bottom? Sorry for bothering you guys but I'm kinda new to this.

CPallini 15-Jan-18 8:30am

If you use Jochen code then add rect_left, to x: namely
x = rect_left + (rect_w - text_w)/2;