yun_電腦圖學筆記week14

 今天老師上課先複習上次教的，先備份main.cpp

接著偷一行程式碼過來把裡面數字改成0.3，30，30

#include <GL/glut.h> void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glutSolidSphere(0.3,30,30); glutSwapBuffers(); } int main(int argc, char** argv) { glutInit( &argc, argv ); glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH ); glutCreateWindow(" Week14 timer "); glutDisplayFunc(display); glutMainLoop(); }

目前會顯示這樣

glutSolidSphere(0.3,30,30);改成glutWireSphere(0.3,30,30);

新增timer讓視窗開啟3秒後變成紅色

#include <GL/glut.h> void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glutWireSphere(0.3,30,30); glutSwapBuffers(); } void timer(int t) { glClearColor(1,0,0,0);///清背景色:紅色 display();///重畫畫面 } int main(int argc, char** argv) { glutInit( &argc, argv ); glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH ); glutCreateWindow(" Week14 timer "); glutDisplayFunc(display); glutTimerFunc(3000,timer,0); glutMainLoop(); }

過了3秒後就會變紅色

更改一下程式碼，會變成等3秒後方塊旋轉

#include <GL/glut.h> float angle=0; void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glRotatef(angle,0,0,1); glutSolidCube(0.3); glPopMatrix(); glutSwapBuffers(); } void timer(int t) { glutTimerFunc(30,timer,t+1); glClearColor(1,0,0,0);///清背景色:紅色 angle++; display();///重畫畫面 } int main(int argc, char** argv) { glutInit( &argc, argv ); glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH ); glutCreateWindow(" Week14 timer "); glutDisplayFunc(display); glutTimerFunc(3000,timer,0); glutMainLoop(); }

接著我們讓他可以往左邊敲90度完換右邊敲90度

#include <GL/glut.h> float angle=0; void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glRotatef(angle,0,0,1); glutSolidCube(0.3); glPopMatrix(); glutSwapBuffers(); } int diff=2; void timer(int t) { glutTimerFunc(20,timer,t+1); glClearColor(1,0,0,0);///清背景色:紅色 if(angle>90)diff=-2; if(angle<0)diff=+2; angle+=diff; display();///重畫畫面 } int main(int argc, char** argv) { glutInit( &argc, argv ); glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH ); glutCreateWindow(" Week14 timer "); glutDisplayFunc(display); glutTimerFunc(3000,timer,0); glutMainLoop(); }

接著我們讓他有個小手臂

#include <GL/glut.h> float angle=0; void drawArm1() { glPushMatrix(); glScalef(1,0.5,0.5);///變細長的手臂 glColor3f(1,0,0);///紅色的手臂 glutSolidCube(0.2); glPopMatrix(); } void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glColor3f(1,1,1); glutSolidCube(0.4); glPushMatrix(); ///glTranslatef(); ///glRotatef(angle,0,0,1); glTranslatef(-0.1,0,0); drawArm1(); glPopMatrix(); glPopMatrix(); glutSwapBuffers(); } int diff=2; void timer(int t) { glutTimerFunc(20,timer,t+1); glClearColor(1,0,0,0);///清背景色:紅色 if(angle>90)diff=-2; if(angle<0)diff=+2; angle+=diff; display();///重畫畫面 } int main(int argc, char** argv) { glutInit( &argc, argv ); glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH ); glutCreateWindow(" Week14 timer "); glutDisplayFunc(display); glutTimerFunc(3000,timer,0); glutMainLoop(); }

一開始長這個樣子

3秒後變這個樣子

接著我們讓他手臂轉動

#include <GL/glut.h> float angle=0; void drawArm1() { glPushMatrix(); glScalef(1,0.5,0.5);///變細長的手臂 glColor3f(0,1,0);///綠色的手臂 glutSolidCube(0.2); glPopMatrix(); } void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glColor3f(1,1,1); glutSolidCube(0.4);///白色的身體 glPushMatrix(); glTranslatef(-0.2,0.2,0);///掛上肩膀 glRotatef(angle,0,0,1); glTranslatef(-0.1,0,0); drawArm1(); glPopMatrix(); glPopMatrix(); glutSwapBuffers(); } int diff=2; void timer(int t) { glutTimerFunc(20,timer,t+1); glClearColor(1,0,0,0);///清背景色:紅色 if(angle>90)diff=-2; if(angle<0)diff=+2; angle+=diff; display();///重畫畫面 } int main(int argc, char** argv) { glutInit( &argc, argv ); glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH ); glutCreateWindow(" Week14 timer "); glutDisplayFunc(display); glutTimerFunc(3000,timer,0); glutMainLoop(); }

3秒後手臂開始轉動，跟上一個程式碼手臂改了變綠色避免紅色看不到