Cid week02 點線面色彩

Week02 

電腦圖學

Step01 下載moodle的FreeGLUT MinGW壓縮檔案，並解壓縮至桌面，把lib資料夾內的libfreeglut.a檔案複製貼上並重新命名libglut32.a，開啟Code Blocks，開啟新專案，File>Project>選擇GLUT Project>命名專案>選擇桌面的資料夾freeglut>最後執行程式。

Step02 打開程式碼 複製需要的10行程式碼最後執行

#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("Week03");

    glutDisplayFunc(display);

    glutMainLoop();

}

程式碼

#include <GL/glut.h>

void display()

{

    glColor3f(1,1,0);

    glutSolidTeapot(0.5);

    glColor3f(0,1,0);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week02");

    glutDisplayFunc(display);

    glutMainLoop();

}

Step03 開新專案 利用新的程式碼點來畫綠色三角形

程式碼

#include <GL/glut.h>

void display()

{

    glColor3f(0,1,0);

    glBegin(GL_POLYGON);

        glVertex2f(0,1);

        glVertex2f(-1,-1);

        glVertex2f(+1,-1);

    glEnd();

    glColor3f(1,1,0);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week02");

    glutDisplayFunc(display);

    glutMainLoop();

}

Step04更改三角形的色彩

程式碼 黃色部分頂點顏色 紅色部分頂點位置

#include <GL/glut.h>

void display()

{

    glBegin(GL_POLYGON);

        glColor3f(1,0,0);glVertex2f(0,1);

        glColor3f(0,1,0);glVertex2f(-1,-1);

        glColor3f(0,0,1);glVertex2f(+1,-1);

    glEnd();

    glColor3f(1,1,0);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week02");

    glutDisplayFunc(display);

    glutMainLoop();

}

Step05 利用頂點和小畫家來畫自己想要的圖

程式碼

#include <GL/glut.h>

void display()

{

    glBegin(GL_POLYGON);

        glVertex2f((65-100)/100.0,-(54-100)/100.0);

        glVertex2f((34-100)/100.0,-(138-100)/100.0);

        glVertex2f((59-100)/100.0,-(138-100)/100.0);

        glVertex2f((87-100)/100.0,-(53-100)/100.0);

    glEnd();

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week02");

    glutDisplayFunc(display);

    glutMainLoop();

}

Step06 小畫家也可以幫我們找顏色裡用滴管工具

程式碼 顏色部分

#include <GL/glut.h>

void display()

{

    glColor3f(252/255.0,140/255.0,58/255.0);

    glBegin(GL_POLYGON);

        glVertex2f((65-100)/100.0,-(54-100)/100.0);

        glVertex2f((34-100)/100.0,-(138-100)/100.0);

        glVertex2f((59-100)/100.0,-(138-100)/100.0);

        glVertex2f((87-100)/100.0,-(53-100)/100.0);

    glEnd();

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week02");

    glutDisplayFunc(display);

    glutMainLoop();

}

Step06 畫圓形

新的程式碼   圓心座標位置

#include <GL/glut.h>

#include <math.h>

void myCircle(float r,float x,float y)

{

    glBegin(GL_POLYGON);

    for(float a=0;a<=2*3.141592;a+=0.01){

        glVertex2f(r*cos(a)+x,r*sin(a)+y);

    }

    glEnd();

}

void display()

{

    glColor3f(252/255.0,140/255.0,58/255.0);

    myCircle(0.5,0,0);

    glColor3f(1,1,0);

    myCircle(0.3,0.5,0.5);

    glColor3f(1,0,0);

    myCircle(0.3,-0.5,0.5);

    glColor3f(0,1,0);

    myCircle(0.3,-0.5,-0.5);

    glColor3f(0,0,1);

    myCircle(0.3,0.5,-0.5);

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week02");

    glutDisplayFunc(display);

    glutMainLoop();

}