
作業互評

下載 window data glut32
開啟 Transformation
了解 旋轉 移動 縮放 的使用方法


開 一個GLUT
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-150)/150.0, (%d-150)/150.0 ); \n ", x, y);
}
void display()
{
glBegin(GL_POLYGON);
glColor3f(1,1,0);
glVertex2f(0.5,0.5);
glVertex2f(0.5,-0.5);
glVertex2f(0,0);
glEnd();
glutSwapBuffers();
}
int main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("hello 3D");
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMainLoop();
}

用程式碼畫出圓形
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-150)/150.0, (%d-150)/150.0 ); \n ", x, y);
}
void display()
{
glClearColor(150/255.0,172/255.0,55/255.0,1);
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();
glutSwapBuffers();
}
int main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("hello 3D");
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMainLoop();
}
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