利用4個Vertex，在window畫出一個正方形。
```cpp
#include <GL/glut.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glColor3f(0,1,0);
glBegin(GL_POLYGON);
glVertex2f(0.5, 0.5);
glVertex2f(-0.5, 0.5);
glVertex2f(-0.5, -0.5);
glVertex2f(0.5, -0.5);
glEnd();
glColor3f(1,1,0);
glutSolidTeapot( 0.3 );
glutSwapBuffers();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16");
glutDisplayFunc(display);
glutMainLoop();
}
```
2. 移動
藉由motion函式移動圖形 ( 茶壺 )。
```cpp
#include <GL/glut.h>
float teapotX=0, teapotY=0;
void motion(int x, int y)
{
teapotX = (x-150) / 150.0;
teapotY = (150-y) / 150.0;
glutPostRedisplay();
}
void display() {
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(teapotX, teapotY, 0);
glutSolidTeapot( 0.3 );
glPopMatrix();
glutSwapBuffers();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutMainLoop();
}
```
3. 旋轉
```cpp
#include <GL/glut.h>
float teapotX=0, teapotY=0, angle=0, oldX=0, oldY=0;
void mouse(int button, int state, int x, int y)
{
oldX = x;
oldY = y;
}
void motion(int x, int y)
{
angle += x - oldX; ///teapotX = (x-150) / 150.0;
oldX = x; ///teapotY = (150-y) / 150.0;
glutPostRedisplay();
}
void display() {
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angle, 0, 0, 1); ///glTranslatef(teapotX, teapotY, 0);
glutSolidTeapot( 0.3 );
glPopMatrix();
glutSwapBuffers();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutMouseFunc(mouse);
glutMainLoop();
}
```
4. 移動時，列出座標
```cpp
#include <GL/glut.h>
#include <stdio.h>
float teapotX=0, teapotY=0, angle=0, oldX=0, oldY=0;
void mouse(int button, int state, int x, int y)
{
oldX = x;
oldY = y;
}
void motion(int x, int y)
{
teapotX = (x-150) / 150.0;///angle += x - oldX; ///
teapotY = (150-y) / 150.0;///oldX = x; ///
printf("glTranslatef(%.3f , %.3f , 0 );\n", teapotX, teapotY);
glutPostRedisplay();
}
void display() {
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glColor3f(1,1,1);
///glTranslatef(....);
///glRotatef(angle, 0, 0, 1);
///glTranslatef(....);
glTranslatef(teapotX, teapotY, 0);
glutSolidTeapot( 0.3 );
glPopMatrix();
glColor3f(0,1,0);
glutSolidTeapot( 0.01 );
glutSwapBuffers();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutMouseFunc(mouse);
glutMainLoop();
}
```
5. T-R-T移動關節
```cpp
#include <GL/glut.h>
#include <stdio.h>
float teapotX=0, teapotY=0, angle=0, oldX=0, oldY=0;
void mouse(int button, int state, int x, int y)
{
oldX = x;
oldY = y;
}
void motion(int x, int y)
{
teapotX = (x-150) / 150.0;
teapotY = (150-y) / 150.0;
angle += x - oldX;
oldX = x;
printf("glTranslatef(%.3f , %.3f , 0 );\n", teapotX, teapotY);
glutPostRedisplay();
}
void display() {
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glColor3f(1,1,1);
glTranslatef(-0.420 , +0.047 , 0 ); ///glTranslatef(....);
glRotatef(angle, 0, 0, 1);
glTranslatef(0.420 , -0.047 , 0 ); ///glTranslatef(....);
///glTranslatef(teapotX, teapotY, 0);
glutSolidTeapot( 0.3 );
glPopMatrix();
glColor3f(0,1,0);
glutSolidTeapot( 0.01 );
glutSwapBuffers();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutMouseFunc(mouse);
glutMainLoop();
}
```
6. 鋼彈 OpenCV、貼圖(Texture)
```cpp
#include <GL/glut.h>
#include <stdio.h>
#include "glm.h"
GLMmodel * gundam = NULL;
float teapotX=0, teapotY=0, angle=0, oldX=0, oldY=0;
void mouse(int button, int state, int x, int y)
{
oldX = x;
oldY = y;
}
void motion(int x, int y) {
teapotX = (x-150) / 150.0;
teapotY = (150-y) / 150.0;
angle += x - oldX;
oldX = x;
printf("glTranslatef(%.3f , %.3f , 0 );\n", teapotX, teapotY);
glutPostRedisplay();
}
void display() {
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glColor3f(1,0,0);
glScalef(0.03, 0.03, 0.03);
glmDraw(gundam, GLM_MATERIAL);
glPopMatrix();
glColor3f(0,1,0);
glutSolidTeapot( 0.01 );
glutSwapBuffers();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutMouseFunc(mouse);
gundam = glmReadOBJ("model/gundam.obj");
glutMainLoop();
}
```
7.貼圖材質
```cpp
#include <stdio.h>
#include <opencv/highgui.h> ///使用 OpenCV 2.1 比較簡單, 只要用 High GUI 即可
#include <opencv/cv.h>
#include <GL/glut.h>
#include "glm.h"
GLMmodel * gundam = NULL;
int myTexture(char * filename)
{
IplImage * img = cvLoadImage(filename); ///OpenCV讀圖
cvCvtColor(img,img, CV_BGR2RGB); ///OpenCV轉色彩 (需要cv.h)
glEnable(GL_TEXTURE_2D); ///1. 開啟貼圖功能
GLuint id; ///準備一個 unsigned int 整數, 叫 貼圖ID
glGenTextures(1, &id); /// 產生Generate 貼圖ID
glBindTexture(GL_TEXTURE_2D, id); ///綁定bind 貼圖ID
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖T, 就重覆貼圖
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖S, 就重覆貼圖
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); /// 貼圖參數, 放大時的內插, 用最近點
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); /// 貼圖參數, 縮小時的內插, 用最近點
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->imageData);
return id;
}
float teapotX=0, teapotY=0, angle=0, oldX=0, oldY=0;
void mouse(int button, int state, int x, int y) {
oldX = x;
oldY = y;
}
void motion(int x, int y) {
teapotX = (x-150) / 150.0;
teapotY = (150-y) / 150.0;
angle += x - oldX;
oldX = x;
printf("glTranslatef(%.3f , %.3f , 0 );\n", teapotX, teapotY);
glutPostRedisplay();
}
void display() {
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glColor3f(1,1,1);///glColor3f(1,0,0);
glScalef(0.03, 0.03, 0.03);
glRotatef(angle, 0, 1, 0);
glmDraw(gundam, GLM_MATERIAL | GLM_TEXTURE);
glPopMatrix();
glColor3f(0,1,0);
glutSolidTeapot( 0.01 );
glutSwapBuffers();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutMouseFunc(mouse);
gundam = glmReadOBJ("model/gundam.obj");
myTexture("model/Diffuse.jpg");
glEnable(GL_DEPTH_TEST);
glutMainLoop();
}
```
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