IMAGE.C
上传用户:tengyuc
上传日期:2007-08-14
资源大小:722k
文件大小:3k
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#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>
#define checkImageWidth 64
#define checkImageHeight 64
GLubyte checkImage[checkImageHeight][checkImageWidth][3];
static GLdouble zoomFactor = 1.0;
static GLint height;
// 生成棋盘格图像数据
void makeCheckImage(void)
{
int i, j, c;
for (i = 0; i < checkImageHeight; i++) {
for (j = 0; j < checkImageWidth; j++) {
c = ((((i&0x8)==0)^((j&0x8))==0))*255;
checkImage[i][j][0] = (GLubyte) c;
checkImage[i][j][1] = 255-(GLubyte) c;
checkImage[i][j][2] = (GLubyte) c;
}
}
}
void init(void)
{
glClearColor (0.0, 0.0, 0.0, 0.0);
glShadeModel(GL_FLAT);
makeCheckImage();
- // 设置像素存储模式
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
- // 设置像素位置
glRasterPos2i(0, 0);
- // 绘制像素
glDrawPixels(checkImageWidth, checkImageHeight, GL_RGB,
GL_UNSIGNED_BYTE, checkImage);
glFlush();
}
void reshape(int w, int h)
{
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
height = (GLint) h;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0, (GLdouble) w, 0.0, (GLdouble) h);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void motion(int x, int y)
{
static GLint screeny;
screeny = height - (GLint) y;
- // 设置绘制像素的位置
glRasterPos2i (x, screeny);
- // 设置像素缩放系数
glPixelZoom (zoomFactor, zoomFactor);
- // 像素拷贝操作
glCopyPixels (0, 0, checkImageWidth, checkImageHeight, GL_COLOR);
glPixelZoom (1.0, 1.0);
glFlush ();
}
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 'r':
case 'R':
zoomFactor = 1.0;
glutPostRedisplay();
printf ("zoomFactor reset to 1.0n");
break;
case 'z':
zoomFactor += 0.5;
if (zoomFactor >= 3.0)
zoomFactor = 3.0;
printf ("zoomFactor is now %4.1fn", zoomFactor);
break;
case 'Z':
zoomFactor -= 0.5;
if (zoomFactor <= 0.5)
zoomFactor = 0.5;
printf ("zoomFactor is now %4.1fn", zoomFactor);
break;
case 27:
exit(0);
break;
default:
break;
}
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(250, 250);
glutInitWindowPosition(100, 100);
glutCreateWindow(argv[0]);
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutMotionFunc(motion);
glutMainLoop();
return 0;
}