END之書 week05

 1. 3dcg.org.....Transformation.exe...

    下方右鍵，可變自轉、公轉

2-1.按keyboard，畫面顯示座標

#include <GL/glut.h>

#include <stdio.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,0);

    glutSolidTeapot(0.5);

    glutSwapBuffers();

}

void keyboard( unsigned char key,int x,int y )

{

    printf("你按下了 %c 在 %d %d 座標\n",key,x,y);

}

int main(int argc,char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}

2-2. 把上週、上上週的加進去，但中間空白

2-3. 加入motion並做宣告修改

#include <GL/glut.h>

#include <stdio.h>

float x=0,y=0,z=0;

int oldX=0,oldY=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef((x-150)/150.0 , -(y-150)/150.0, z);

        glColor3f(1,1,0);

        glutSolidTeapot(0.5);

    glPopMatrix();

    glutSwapBuffers();

}

void keyboard( unsigned char key,int mouseX,int mouseY )

{

}

void mouse(int button , int state , int mouseX , int mouseY)

{

}

void motion(int mouseX ,int mouseY)///按住滑鼠進行移動，會有瞬移情況

{

    x+=(mouseX-oldX) , y+=(mouseY-oldY);

    oldX=mouseX , oldY=mouseY;

    display();

}

int main(int argc,char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);///this week

    glutMouseFunc(mouse);///last last week

    glutMotionFunc(motion);///last week

    glutMainLoop();

}

2-4 加入mouse使其正常移動，並新增背景顏色

#include <GL/glut.h>

#include <stdio.h>

float x=150,y=150,z=0;

int oldX=0,oldY=0;

void display()

{

    glClearColor( 0.3 , 0.4 , 0.6 , 1);///R、G、B、A，A為半透明，目前關閉

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef((x-150)/150.0 , -(y-150)/150.0, z);

        glColor3f(1,1,0);

        glutSolidTeapot(0.5);

    glPopMatrix();

    glutSwapBuffers();

}

void keyboard( unsigned char key,int mouseX,int mouseY )

{

}

void mouse(int button , int state , int mouseX , int mouseY)

{

    oldX=mouseX,oldY=mouseY;///解決"瞬移"

}

void motion(int mouseX ,int mouseY)///會有瞬移情況

{

    x+=(mouseX-oldX) , y+=(mouseY-oldY);

    oldX=mouseX , oldY=mouseY;

    display();

}

int main(int argc,char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);///this week

    glutMouseFunc(mouse);///last last week

    glutMotionFunc(motion);///last week

    glutMainLoop();

}

2-5 原地放大縮小

#include <GL/glut.h>

#include <stdio.h>

float x=150,y=150,z=0,scale=1.0;

int oldX=0,oldY=0;

void display()

{

    glClearColor( 0.1 , 0.7 , 0.5 , 1);///R、G、B、A，A為半透明，目前關閉

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef((x-150)/150.0 , -(y-150)/150.0, z);

        glScalef(scale , scale , scale);///縮放為scale倍

        glColor3f(1,1,0);

        glutSolidTeapot(0.5);

    glPopMatrix();

    glutSwapBuffers();

}

void keyboard( unsigned char key,int mouseX,int mouseY )

{

}

void mouse(int button , int state , int mouseX , int mouseY)

{

    oldX=mouseX,oldY=mouseY;///解決"瞬移"

}

void motion(int mouseX ,int mouseY)///會有瞬移情況

{

    if( mouseX-oldX > 0) scale*=1.1;///放大縮小

    if( mouseX-oldX < 0) scale*=0.9;

    (此行刪除，使其固定原地)

    oldX=mouseX , oldY=mouseY;

    display();

}

int main(int argc,char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);///this week

    glutMouseFunc(mouse);///last last week

    glutMotionFunc(motion);///last week

    glutMainLoop();

}