glutBitmapCharacter() text not appearing on screen?

Question

#include "stdafx.h" #include <math.h> #include <stdlib.h> #include <stdio.h> #include "glut.h" int winWidth = 700; int winHeight = 600; void init() { glClearColor(0.0, 0.0, 0.0, 0.0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, winWidth, 0.0, winHeight); } void renderSpacedBitmapString(float x, float y, void *font, char *string) { char *c; int x1 = x; for (c = string; *c != '\0'; c++) { glRasterPos2f(x1, y); glutBitmapCharacter(font, *c); x1 = x1 + glutBitmapWidth(font, *c); } } void draw_text() { glColor3f(255.0, 0, 0.0); /* red color */ char buf[100] = { 0 }; sprintf_s(buf, "DO YOU WANT TO GO TO SPACE?"); renderSpacedBitmapString(15, 600, GLUT_BITMAP_HELVETICA_18, buf); } void display(void) { glClear(GL_COLOR_BUFFER_BIT); draw_text(); glFlush(); } int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); glutInitWindowSize(winWidth, winHeight); glutInitWindowPosition(100, 100); glutCreateWindow("Drawn Text"); init(); glutDisplayFunc(display); glutMainLoop(); return 0; }

I have this problem where I can't make the text appear on the screen, however when I change the gluOrtho2D code to gluOrtho2D(-200.0, 800, -200.0, 800); it starts to work, but I want to keep the gluOrtho2D code the same as above, and I don't want to change it.

genpfault · Accepted Answer · 2019-01-07 18:49:51Z

2

y = 600 is just a bit above your gluOrtho2D() clip volume. Drop the string down a bit (passing 580 into the y argument of renderSpacedBitmapString() works) or increase the window height (620 works).

edited Jan 7, 2019 at 18:49

answered Jan 7, 2019 at 17:29

genpfault

52.3k12 gold badges93 silver badges153 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Muddy Over a year ago

Is there not a way to move the text down, rather than increasing the window size?

Rabbid76 Over a year ago

@Muddy Yes, as suggested in the answer renderSpacedBitmapString(15, 580, GLUT_BITMAP_HELVETICA_18, buf);

Collectives™ on Stack Overflow

glutBitmapCharacter() text not appearing on screen?

1 Answer 1

2 Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Related