Week04 藍振瑋 電腦圖學上課筆記

1.去http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/ 下載檔案，先嘗試下圖學的移動、縮放、旋轉功能
data.zip→桌面\window\data\模型.obj
windows.zip→桌面\windiw\Transformation.exe
glut32.dll→桌面\window\glut32.dll
●將windows.zip先解壓，再把glut32.dll和data.zip解壓一起放到windows的資料夾

2.開啟GLUT專案，輸入上周的程式碼，比上周多一行新增:glTranlatef(0,0,0);，讓茶壺可以改變座標位置

#include <GL/glut.h>
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glTranslatef(0.3,0.3,0);///追加的程式碼
        glutSolidTeapot(0.3);
    glPopMatrix();
    glutSwapBuffers();
}
int main(int argc, char**argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("04162664 Translate Rotate Scale");

    glutDisplayFunc(display);
    glutMainLoop();

}

3.新增motion程式碼能夠使用滑鼠移動茶壺的位置

#include <GL/glut.h>

float mouseX=0, mouseY=0;///x、y座標數值設定

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(mouseX,mouseY,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void motion(int x, int y)

{

    mouseX = (x-150)/150.0;///滑鼠座標修正

    mouseY = -(y-150)/150.0;

    glutPostRedisplay();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("04162664 Translate Rotate Scale");

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

4.修改程式碼，讓茶壺可以自由縮放旋轉

#include <GL/glut.h>

float mouseX=0, mouseY=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///backup the matrix

        glScalef(mouseX,mouseY,0);///Today's Most Important line

        glutSolidTeapot(0.3);

    glPopMatrix();///restore the matrix

    glutSwapBuffers();

}

void motion(int x, int y)

{

    mouseX = (x-150)/150.0;/// x/300.0

    mouseY = -(y-150)/150.0;/// y/300.0

    glutPostRedisplay();///貼個便利貼 Post便利貼，告訴GLUT

    ///要重畫畫面 Re-display

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("04162664 Translate Rotate Scale");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

    glutMainLoop();

}