


2. 主題 : 平移/旋轉/縮放

3. Mouse 操作
程式碼 :
#include <GL/glut.h>
#include <stdio.h>
void mouse(int button,int state,int x,int y)
{
if(state==GLUT_DOWN)
{
printf("glVertex2f((%d-100)/100,-(%d-100)/100)\n",x,y);
}
}
void display()
{
glBegin(GL_POLYGON);
glColor3f(0,0.2,0.8);
glVertex2f(-0.5,0.5);
glVertex2f(-0.5,-0.5);
glVertex2f(1,0);
glVertex2f(1,1);
glEnd();
glutSwapBuffers();
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("hello3D");
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMainLoop();
}

4. glTranslatef (x,y,z);
glRotatef (角度,x,y,z);
glScalef (x,y,z);
**補充**
課堂補充 : 畫圓
程式碼 :
#include <GL/glut.h>
#include <stdio.h>
#include <math.h>
void mouse(int button,int state,int x,int y)
{
if(state==GLUT_DOWN)
{
printf("glVertex2f((%d-100)/100,-(%d-100)/100)\n",x,y);
}
}
void display()
{
glClearColor(150/255.0,170/255.0, 55/255.0, 1);
glClear(GL_COLOR_BUFFER_BIT);
glColor3ub(175, 193, 81);
glPushMatrix();
glBegin(GL_POLYGON);
for(float angle=0; angle<3.14159265357989 *2;angle+= 0.1){
glVertex2f( 0.2*cos(angle), 0.2*sin(angle) );
}
glEnd();
glPopMatrix();
glPushMatrix();
glTranslatef(0, 0.5, 0);
glBegin(GL_POLYGON);
for(float angle=0; angle<3.14159265357989 *2; angle+= 0.1){
glVertex2f( 0.2*cos(angle), 0.2*sin(angle) );
}
glEnd();
glPopMatrix();
glPushMatrix();
glTranslatef(-0.5, 0, 0);
glBegin(GL_POLYGON);
for(float angle=0; angle<3.14159265357989 *2; angle+= 0.1){
glVertex2f( 0.2*cos(angle), 0.2*sin(angle) );
}
glEnd();
glPopMatrix();
glPushMatrix();
glutSwapBuffers();
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("hello3D");
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMainLoop();
}

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