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now a toggle for perspective/orthogonal projection in shapes demo

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git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1152 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
dcnieho 2012-03-16 06:05:33 +00:00
parent f692084300
commit 5bb67c1c82
1 changed files with 16 additions and 8 deletions
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24
freeglut/freeglut/progs/demos/shapes/shapes.c
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@ -13,6 +13,7 @@
- <tt>Esc &nbsp;</tt> Quit
- <tt>q Q &nbsp;</tt> Quit
- <tt>i I &nbsp;</tt> Show info
- <tt>p P &nbsp;</tt> Toggle perspective or orthographic projection
- <tt>= + &nbsp;</tt> Increase \a slices
- <tt>- _ &nbsp;</tt> Decreate \a slices
- <tt>, < &nbsp;</tt> Decreate \a stacks
@ -64,6 +65,8 @@ static double orad = 1.0; /* doubles as size for objects other than Torus */
static int depth = 4;
static double offset[ 3 ] = { 0, 0, 0 };
static GLboolean show_info = GL_TRUE;
static float ar;
static int persProject = 1;
/*
* These one-liners draw particular objects, fetching appropriate
@ -224,16 +227,9 @@ static void shapesPrintf (int row, int col, const char *fmt, ...)
static void
resize(int width, int height)
{
const float ar = (float) width / (float) height;
ar = (float) width / (float) height;
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity() ;
}
static void display(void)
@ -241,6 +237,15 @@ static void display(void)
const double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
const double a = t*90.0;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (persProject)
glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);
else
glOrtho(-ar*3, ar*3, -3.0, 3.0, 2.0, 100.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_LIGHTING);
@ -309,6 +314,9 @@ key(unsigned char key, int x, int y)
case '0':
case ')': ++depth; break;
case 'P':
case 'p': persProject=!persProject; break;
default:
break;
}