jason week14

安裝gitbash,開啟2023graphicsb

1-1

新增專案week14-timer,這次路徑存在2023graphicsb裡,就用上星期2023graphicsb裡的freeglut

設定時間讓茶壺在一定時間旋轉

#include<GL/glut.h>

float angle=0;

void timer(int t)

{

    glutTimerFunc(500,timer,t+1);

    angle+=90;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutTimerFunc(3000,timer,0);

    glutDisplayFunc(display);

    glutMainLoop();

}

1-2

新增專案week14-2_timer_play

增加keyboard函式,點擊鍵盤讓茶壺旋轉

 2-1

用Excel算出alpha值,(alpha)*新的+(1-alpha)*舊的

github上傳week14的兩個檔案

2-2

新專案week14-3_timer_play_interpolation

增加mouse motion函式,讓畫面執行的時候用滑鼠左右移動,再按空白鍵來重複剛才移動的軌跡

#include<GL/glut.h>

float angle=0,newAngle=0,oldAngle=0;

float oldX=0;

void timer(int t)

{

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

    float alpha =t/100.0;

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

    glutPostRedisplay();

}

void keyboard(unsigned char key ,int x,int y)

{

    glutTimerFunc(0,timer,0);

}

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

{

    if(state==GLUT_DOWN)oldAngle=angle;

    if(state==GLUT_UP)newAngle=angle;

    oldX=x;

    glutPostRedisplay();

}

void motion(int x,int y)

{

    angle+=x-oldX;

    oldX=x;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutKeyboardFunc(keyboard);

    //glutTimerFunc(3000,timer,0);

    glutDisplayFunc(display);

    glutMainLoop();

}

3-1

按下數字鍵可以改變關節的顏色

#include<stdio.h>

#include<GL/glut.h>

#include "glm.h"

GLMmodel * head = NULL;

GLMmodel * body = NULL;

GLMmodel * ruparmR = NULL;

GLMmodel * rlowarmR = NULL;

int show[4]={1,1,1,1};

int ID =2;

float teapotX=0,teapotY=0;

FILE * fout =NULL;

FILE * fin=NULL;

void keyboard(unsigned char key,int x,int y){

    if(key=='0')ID=0;//show[0]=! show[0];

    if(key=='1')ID=1;//show[1]=! show[1];

    if(key=='2')ID=2;//show[2]=! show[2];

    if(key=='3')ID=3;//show[3]=! show[3];

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    if(head==NULL){

        head =glmReadOBJ("model/head.obj");

        body =glmReadOBJ("model/body.obj");

        ruparmR =glmReadOBJ("model/ruparm.obj");

        rlowarmR =glmReadOBJ("model/rlowarm.obj");

        ///glmUnitize(head);

    }

    glPushMatrix();

        glScalef(0.3,0.3,0.3);

        glPushMatrix();

        glTranslatef(teapotX,teapotY,0);

        if (ID==0)glColor3f(1,0,0);

        else glColor3f(1,1,1);

        if (show[0])glmDraw(head,GLM_MATERIAL);

        glPopMatrix();

        if (ID==1)glColor3f(1,0,0);

        else glColor3f(1,1,1);

        if (show[1])glmDraw(body,GLM_MATERIAL);

        if (ID==2)glColor3f(1,0,0);

        else glColor3f(1,1,1);

        if (show[2])glmDraw(ruparmR,GLM_MATERIAL);

        if (ID==3)glColor3f(1,0,0);

        else glColor3f(1,1,1);

        if (show[3])glmDraw(rlowarmR,GLM_MATERIAL);

    glPopMatrix();

    glutSwapBuffers();

}

int oldX=0, oldY=0;

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

{

    if(state ==GLUT_DOWN){

        oldX=x;

        oldY=y;

    }

}

void motion(int x,int y){

    teapotX+=(x-oldX)/150.0;

    teapotY-=(y-oldY)/150.0;

    oldX=x;

    oldY=y;

    glutPostRedisplay();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week12");

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMainLoop();

}

3-2

增加程式讓移動關節的時候可以出現移動座標