91 week15

 到https://jsyeh.org/3dcg10/

下載win32、data檔案解壓縮

開啟Projection.exe

調整攝影機角度

look at:眼睛

中心點

向量位置

week15-1:

安裝git 打開git bash

cd desktop

git clone https://github.com/SeanC91/2023graphicsb

cd 2023graphicsb

start  .

開啟新專案freeglut連結

利用+-號控制角個數

添加程式碼到int main()上面:

float eyeX=0,eyeY=0;

void motion(int x,int y){

    eyeX=3*(x-320)/320.0;

    eyeY=3*(240-y)/240.0;

    glLoadIdentity();

    gluLookAt(eyeX,eyeY,-3,   0,0,-6,   0,1,0);

    glutPostRedisplay();

}

增加:glutMotionFunc(motion);到glut shape下面

gluPerspective(fovy,aspect,zNear,zFar);

fov:field of view  (y方向)

aspect:aspect ratio 長寬比

zNear

zFar

week15-2:

開新專案glut

y軸為準，犧牲x軸:

長寬比:const float ar = (float) width / (float) height;

兩行程式碼做切換:

glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);///斜的(受邊界影響)

    glOrtho(-ar*3, ar*3, -1.0*3, 1.0*3, 2.0, 100.0);///正的(不受邊界影響)

切換第三種程式碼:

gluPerspective(60,ar,0.01,1000);

push上雲端:

week15-3:

滑鼠旋轉茶壺

#include <GL/glut.h>

void display(){

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void motion(int x,int y){

    glLoadIdentity();

    float eyeX=(x-150)/150.0,eyeY=(150-y)/150.0;

    gluLookAt(eyeX,eyeY,1,   0,0,0,   0,1,0);

    glutPostRedisplay();

}

void reshape(int w,int h){

    float ar=w/(float)h;

    glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    gluPerspective(60,ar,0.01,1000);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    gluLookAt(0,0,1,   0,0,0,   0,1,0);

}

int main(int argc,char**argv){

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week15");

    glutReshapeFunc(reshape);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

week15-4:
修改角度變陣列:

float angle[20]={};

glRotatef(angle[2],0,0,1);

glRotatef(angle[3],0,0,1);

angle[ID]+=x-oldX;

程式碼完整版:

#include <stdio.h>

#include <GL/glut.h>

#include "glm.h"

GLMmodel*head=NULL;

GLMmodel*body=NULL;

GLMmodel*uphandr=NULL;

GLMmodel*downhandr=NULL;

int show[4]={1,1,1,1};///week14_step03_1

int ID =2;///week14_step03_1

float teapotX=0,teapotY=0;

float angle[20]={};

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");

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

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

    }

    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);

        glPushMatrix();

        glTranslatef(-1.360000,+0.500000,0);

        glRotatef(angle[2],0,0,1);

        glTranslatef(1.360000,-0.500000,0);

        if(ID==2)glColor3f(1,0,0);

        else glColor3f(1,1,1);

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

        glPushMatrix();

        glTranslatef(-1.959999,+0.080000,0);

        glRotatef(angle[3],0,0,1);

        glTranslatef(1.959999,-0.080000,0);

        if(ID==3)glColor3f(1,0,0);

        else glColor3f(1,1,1);

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

        glPopMatrix();

        glPopMatrix();

        glPopMatrix();

        glColor3f(0,1,0);

        glutSolidTeapot(0.02);

    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*3;

    teapotY-=(y-oldY)/150.0*3;

    printf("glTranslatef(%f,%f,0);\n",teapotX,teapotY);

    angle[ID]+=x-oldX;

    oldX=x;

    oldY=y;

    glutPostRedisplay();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("Final_Project");

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMainLoop();

}

git push上雲端