Doing nothing losing life week03

 Week03

Step01

1.去 https://jsyeh.org/3dcg10/ 下載windows.zip 和 data.zip

2.解壓縮 windows.zip 和 data.zip

3.將解壓縮後的data資料夾都進解壓縮後的windows資料夾

4.執行 Transformation.exe

Step02

1.開啟CodeBlocks 新增GLUT專案，檔案名稱week03，存在桌面

2.安裝freeglut，複製libglutfree 並重新命名為 libglut32

3.複製並貼上上週的十行程式碼

#將程式碼放置GitHub gist 用HTML檢視Blog並更新

4新程式碼

    glPushMatrix();               備份矩陣

    glTranslatef( 0.5, 0.5, 0); 向右0.5 向上0.5

    glutSolidTeapot( 0.3 );

    glPushMatrix();               還原矩陣

Week03-2

將原本程式碼改為下列程式碼，讓茶壺能夠按照滑鼠點擊方向移動

#include <GL/glut.h>

float X=0,Y=0,Z=0;   //使用global變數

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);  //清背景

    glPushMatrix();  //備份矩陣

    glTranslatef( X, Y, Z); //照著X Y Z來移動

    glutSolidTeapot( 0.3 );

    glPushMatrix(); //還原矩陣

    glutSwapBuffers();

}

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

{

    X=(x-150)/150.0;   減一半，除一半

    Y=-(y-150)/150.0;  減一半，除一半，Y變負的

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week03");

    glutMouseFunc(mouse);

    glutDisplayFunc(display);

    glutMainLoop();

}

Week03-3

將程式碼改為下列程式碼

#include <GL/glut.h>

#include <stdio.h>

float X=0,Y=0,Z=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glBegin(GL_POLYGON);

    glVertex2f(-0.44,0.49);

    glVertex2f(-0.27,0.64);

    glVertex2f(0.09,0.71);

    glVertex2f(0.44,0.61);

    glVertex2f(0.51,0.34);              //用滑鼠找出的點

    glVertex2f(0.50,0.01);

    glVertex2f(0.26,-0.30);

    glVertex2f(-0.09,-0.40);

    glVertex2f(-0.47,-0.26);

    glVertex2f(-0.60,0.00);

    glVertex2f(-0.70,0.49);

    glVertex2f(-0.61,0.66);

    glEnd();

    glPushMatrix();

    glutSwapBuffers();

}

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

{

    X=(x-150)/150.0;

    Y=-(y-150)/150.0;

    if(state==GLUT_DOWN) printf("    glVertex2f(%.2f,%.2f);\n",X,Y);

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week03");

    glutMouseFunc(mouse);

    glutDisplayFunc(display);

    glutMainLoop();

}