happy

 WEEK14

STEP01-1

先把程式備分起來 安裝GIT 開GIT BASH

cd desktop 到桌面

git clone  https://github.com/Claudia0729/2023graphicsb

cd 2023graphicsb

start . 開檔案總管

開新專案 week14-timer 專案

新專案 開在桌面2023graphicsb裡 freeglut用2023graphicsb的

Final_project 的 freeglut

原本的10行程式碼,在加上3行timer讓他轉,

使用float angle=0 一開始是0度 之後每次加90度 然後重畫畫面

程式碼:

#include <GL/glut.h>

float angle=0;///step01-1

void timer(int t)///step01-1

{

    glutTimerFunc(500,timer,t+1);///step01-1

    angle += 90;///角度+90度

    glutPostRedisplay();///step01-1 重劃畫面

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///step01-1

        glRotatef(angle,0,0,1);///step01-1

        glutSolidTeapot(0.3);

    glPopMatrix();///step01-1

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutTimerFunc(3000,timer,0);///step01-1

    glutDisplayFunc(display);

    glutMainLoop();

}

STEP 01-2

 按鍵後 在開始播放Play動畫 week14_2_time_play

程式碼:

#include <GL/glut.h>

float angle=0;///step01-1

void timer(int t)///step01-1

{

    glutTimerFunc(33,timer,t+1);///step01-1

    angle += 3;///角度+90度

    glutPostRedisplay();///step01-1 重劃畫面

}

void keyboard(unsigned char key, int x, int y)///step01-2

{

    glutTimerFunc(0,timer,0);///step01-2

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///step01-1

        glRotatef(angle,0,0,1);///step01-1

        glutSolidTeapot(0.3);

    glPopMatrix();///step01-1

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutKeyboardFunc(keyboard);///step01-2

    ///glutTimerFunc(3000,timer,0);///step01-1

    glutDisplayFunc(display);

    glutMainLoop();

}

step02-1

關於動作內插 可以順利把中間的值變出來 使用的攻勢 有個alpha值 介於0.0~1.0之間

使用(alpha)*(新的)+(1-alpha)*(舊的) 能把中間的值都推算出來

把程式備分起來 

git config --global user.email claudialin729@gmail.com

git config --global user.name Claudia0729

git add .

git commit -m week14

git push

STEP02-2

程式碼; 

#include <GL/glut.h>

float angle=0, newAngle = 0 , oldAngle = 0;///step02-2 宣告 新角度 舊角度

float oldX = 0;///STEP02-2 舊的X座標

void timer(int t)///step01-1

{

    if ( t<100 ) glutTimerFunc(33,timer,t+1);///step01-1

    float alpha = t/100.0;///step02-2 所以alpha 介於0.0~1.0 間

    angle = alpha * newAngle + (1-alpha)*oldAngle;///step02-2

    ///angle += 3;///角度+90度

    glutPostRedisplay();///step01-1 重劃畫面

}

void keyboard(unsigned char key, int x, int y)///step01-2

{

    glutTimerFunc(0,timer,0);///step01-2

}

void mouse ( int button, int state , int x , int y )

{

    if( state==GLUT_DOWN) oldAngle = angle;///step02-2

    if( state==GLUT_UP ) newAngle = angle;///step02-2

    oldX = x;///step02-2

    glutPostRedisplay();///step02-2 更新畫面

}

void motion( int x, int y )

{

    angle += x-oldX;///STEP02-2

    oldX= x;///STEP02-2

    glutPostRedisplay();///step02-2更新畫面

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///step01-1

        glRotatef(angle,0,0,1);///step01-1

        glutSolidTeapot(0.3);

    glPopMatrix();///step01-1

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutMouseFunc(mouse);///step02-2

    glutMotionFunc(motion);///step02-2

    glutKeyboardFunc(keyboard);///step01-2

    ///glutTimerFunc(3000,timer,0);///step01-1

    glutDisplayFunc(display);

    glutMainLoop();

}

STEP03-1