電腦圖學紀錄 移動

進入https://jsyeh.org/3dcg10/

下載date,win32,glut32.dll

解壓縮date.zip,windows.zip

將解壓縮後的date資料夾抓進windows資料夾

再開啟windows中的Transformation.exe

開一個GLUT專案

將上星期茶壺的程式碼(基礎10行)

#include <GL/glut.h>

void display()

{

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMainLoop();

}

加上新的程式碼讓他位移

#include <GL/glut.h>

void display()

{

    glPushMatrix();///備份矩陣

        glTranslated(0.5,0,0);///位移

        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();

}

mouse函數

加上mouse函數讓它可以偵測按下去的座標

*button

讓茶壺可以跟滑鼠移動

#include <GL/glut.h>

float X=0, Y=0;///利用 global 變數,在函式之間傳值 (大寫XY)

void display()

{

    glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);///清背景，不然會有殘影

    glPushMatrix();///備份矩陣

        glTranslated(X,Y,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

#include <stdio.h>

void mouse(int button,int state,int x,int y)///小寫xy

{           ///button左右鍵等  state按下去是0，放開是1

    X=(x-150)/150.0;

    Y=-(y-150)/150.0;///口訣:減一半，除一半，y加負號

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week03");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);///呼叫mouse函式

    glutMainLoop();

}

用mouse函數輔助畫不規則圖形

#include <GL/glut.h>

#include <stdio.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);

    glBegin(GL_POLYGON);

    glVertex2f(-0.516,0.340);

   glVertex2f(-0.516,0.288);

   glVertex2f(-0.512,0.240);

   glVertex2f(-0.512,0.156);

   glVertex2f(-0.508,0.056);

   glVertex2f(-0.516,-0.012);

   glVertex2f(-0.476,-0.044);

   glVertex2f(-0.408,-0.056);

   glVertex2f(-0.264,-0.072);

   glVertex2f(-0.152,-0.060);

   glVertex2f(0.008,-0.052);

   glVertex2f(0.144,0.576);

   glVertex2f(0.148,0.496);

   glVertex2f(0.132,0.340);

   glVertex2f(0.124,0.144);

   glVertex2f(0.124,0.048);

   glVertex2f(0.140,-0.052);

   glVertex2f(0.144,-0.108);

    glEnd();

    glColor3f(244/255.0, 209/255.0, 33/255.0);

    glBegin(GL_POLYGON);

    glVertex2f(-0.516,0.352);

   glVertex2f(-0.516,0.424);

   glVertex2f(-0.516,0.496);

   glVertex2f(-0.520,0.568);

   glVertex2f(-0.484,0.664);

   glVertex2f(-0.452,0.616);

   glVertex2f(-0.444,0.540);

   glVertex2f(-0.404,0.500);

   glVertex2f(-0.396,0.472);

   glVertex2f(-0.384,0.444);

   glVertex2f(-0.376,0.416);

   glVertex2f(-0.284,0.996);

    glEnd();

    glBegin(GL_POLYGON);

    glVertex2f(-0.104,0.504);

   glVertex2f(-0.104,0.560);

   glVertex2f(-0.104,0.636);

   glVertex2f(-0.120,0.748);

   glVertex2f(-0.108,0.876);

   glVertex2f(-0.060,0.968);

   glVertex2f(-0.044,0.900);

   glVertex2f(-0.040,0.828);

   glVertex2f(-0.016,0.768);

   glVertex2f(0.012,0.712);

   glVertex2f(0.044,0.644);

   glVertex2f(0.064,0.588);

   glVertex2f(0.080,0.572);

   glEnd();

    glutSwapBuffers();

}

void mouse(int button,int state,int x,int y)///小寫xy

{           ///button左右鍵等  state按下去是0，放開是1

    float X =(x-250)/250.0;

    float Y =-(y-250)/250.0; ///口訣:減一半，除一半，y加負號

    if(state==GLUT_DOWN){///只有按下mouse才印出程式

        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();

}