ww-week03-移動

glTranslatef(0.00,0.00,0.00);     

0.在https://jsyeh.org/3dcg10/中下載[data][win32] glut32.dll三個檔案 / 在資料夾中開啟後分別解壓縮 / 將data資料夾放到window裡

        /開啟window.Transformation.exe

    1. 備份矩陣、還原矩陣、移動：開新Project：week03-1_Translate

        /在main.cpp中更改程式碼複習上週畫出一個茶壺

        /利用備份矩陣glPushMatrix()與還原矩陣 glPopMatrix()來移動茶壺位置

#include <GL/glut.h>

void display()

{

    glPushMatrix();///備份矩陣

        glTranslatef(0.5,0,0);///往右移動

        glutSolidTeapot( 0.3 );

    glPopMatrix();///還原矩陣

glutSwapBuffers();

}

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week03");

glutDisplayFunc(display);

glutMainLoop();

}

  

    2.加入滑鼠

2-1加入mousec()函式

#include <GL/glut.h>

void display()

{

    glPushMatrix();

        glTranslatef(0.5,0,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

glutSwapBuffers();

}

#include <stdio.h>

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

{

    printf("%d %d %d %d\n",button,state,x,y);///state按下去是0,放開是1

}

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week03");

glutDisplayFunc(display);

glutMouseFunc(mouse);///用mouse

glutMainLoop();

}

2-2利用global 變數，在函數之間傳值，滑鼠點到哪，茶壺位置就移到哪

#include <GL/glut.h>

float X=0 ,Y=0;///利用global 變數,在函數之間傳值(大寫的) 

void display()

{

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);///清背景

    glPushMatrix();

        glTranslatef( X, Y,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

glutSwapBuffers();

}

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

{

    X=(x-150)/150.0;

    Y=-(y-150)/150.0;

}

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week03");

glutDisplayFunc(display);

glutMouseFunc(mouse);

glutMainLoop();

}

2-3 用https://gist.github.com/放入程式碼week03-2.cpp檔/放入HTML檢視中

 

    3.用滑鼠點標畫畫：

       3-1放大視窗並加入用滑鼠找標的功能 / 開新檔案

#include <GL/glut.h>

#include <stdio.h>

float X=0 ,Y=0;

void display()

{

     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);///清背景

    glPushMatrix();

        glTranslatef( X, Y,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

glutSwapBuffers();

}

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

{

    float X=(x-250)/250.0;

    float Y=-(y-250)/250.0;

    if(state==GLUT_DOWN){///按下mouse時,才印出,避免有兩行一樣

        printf("   glVertex2f(%.3f, %.3f);\n",X,Y);

    }

}

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutInitWindowSize(500,500);///放大視窗

glutCreateWindow("week03");

glutDisplayFunc(display);

glutMouseFunc(mouse);

        glutMainLoop();

}

        3-2小黑印出程式碼後,複製貼到原程式碼/ 

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);///初始程式

glBegin(GL_POLYGON);

(貼入)

glEnd();

glutSwapBuffers();///初始程式

#include <GL/glut.h>

#include <stdio.h>

float X=0 ,Y=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef( X, Y,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glBegin(GL_POLYGON);

    glVertex2f(-0.504, -0.684);

    glVertex2f(-0.652, -0.524);

    glVertex2f(-0.700, -0.356);

    glVertex2f(-0.564, -0.272);

    glVertex2f(-0.452, -0.280);

    glVertex2f(-0.176, -0.320);

    glVertex2f(-0.144, -0.464);

    glVertex2f(-0.160, -0.576);

    glVertex2f(-0.268, -0.644);

    glVertex2f(-0.352, -0.672);

    glVertex2f(-0.504, -0.684);

    glEnd(); 

glutSwapBuffers();

}

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

{

    float X=(x-250)/250.0;

    float Y=-(y-250)/250.0;

    if(state==GLUT_DOWN){

        printf("glVertex2f(%.3f, %.3f);\n",X,Y);

    }

}

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutInitWindowSize(500,500);

glutCreateWindow("week03");

glutDisplayFunc(display);

glutMouseFunc(mouse);

    glutMainLoop();

}      

 

 

git指令

cd desktop

git clone https://github.com/你的帳號/2023graphicsa

cd 2023graphicsa

加入檔案

git add . 

git status

git config --global user.email "jsyeh@mail.mcu.edu.tw"

git config --global user.name "jsyeh"

git commit -m "week10"

git push