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use cursor keys to translate triangle

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This commit is contained in:
Brian 2007-07-10 11:33:10 -06:00
parent 17b86cfa4e
commit 8733ee9dc9
1 changed files with 33 additions and 12 deletions
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45
progs/trivial/tri-clip.c
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@ -28,26 +28,21 @@
#include <GL/glut.h>
#define CI_OFFSET_1 16
#define CI_OFFSET_2 32
static GLenum doubleBuffer;
static GLfloat Xpos = 0, Ypos = 0;
GLenum doubleBuffer;
static void Init(void)
{
fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
glClearColor(0.0, 0.0, 1.0, 0.0);
glClearColor(0.0, 0.0, 1.0, 0.0);
}
static void Reshape(int width, int height)
{
glViewport(0, 0, (GLint)width, (GLint)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
@ -56,21 +51,45 @@ static void Reshape(int width, int height)
static void Key(unsigned char key, int x, int y)
{
switch (key) {
case 27:
exit(1);
default:
return;
}
glutPostRedisplay();
}
static void
SpecialKey(int key, int x, int y)
{
const GLfloat step = 0.25;
(void) x;
(void) y;
switch (key) {
case GLUT_KEY_UP:
Ypos += step;
break;
case GLUT_KEY_DOWN:
Ypos -= step;
break;
case GLUT_KEY_LEFT:
Xpos -= step;
break;
case GLUT_KEY_RIGHT:
Xpos += step;
break;
}
glutPostRedisplay();
}
static void Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glTranslatef(Xpos, Ypos, 0);
glBegin(GL_TRIANGLES);
glColor3f(0,0,.7);
glVertex3f( 0.9, -0.9, -30.0);
@ -80,12 +99,13 @@ static void Draw(void)
glVertex3f(-1.9, 0.0, -30.0);
glEnd();
glPopMatrix();
glFlush();
if (doubleBuffer) {
glutSwapBuffers();
}
}
static GLenum Args(int argc, char **argv)
@ -131,7 +151,8 @@ int main(int argc, char **argv)
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutSpecialFunc(SpecialKey);
glutDisplayFunc(Draw);
glutMainLoop();
return 0;
return 0;
}