7ru week06

1.電腦圖學之父 Ivan Sutherland (Sketchpad)(https://www.youtube.com/watch?v=6orsmFndx_o)

2.https://jsyeh.org/3dcg10/

    下載windows.zip data.zip

    執行Transformation.exe

    下方右鍵Swap Translate/Rotate (自轉/公轉)

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6.因為glutInitWindowSize(500,500) 一半250

#include <GL/glut.h>

#include <stdio.h>

float x=250, y=250, z=0, scale=1.0, angle=0.0, oldX, oldY;

int now=1;///1:移動 2:旋轉 3:縮放

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///用來Clear的色彩 R,G,B,A Alpha沒用到

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef( (x-250)/250.0 , -(y-250)/250.0 , z );///Maya: w

        glRotatef( angle, 0, 0, 1 );///Maya: e

        glScalef( scale, scale, scale );///Maya: r

        glColor3f( 1, 1, 0 );

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

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

{

    //printf("現在按下:%c 座標在:%d %d\n", key, mouseX, mouseY);

    if(key=='w' || key=='W') now=1;///移動(小心不要中文)

    if(key=='e' || key=='E') now=2;///旋轉

    if(key=='r' || key=='R') now=3;///縮放

}

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

{

    oldX = mouseX; oldY = mouseY;

}

void motion( int mouseX, int mouseY )

{

    if(now==1){///移動

        x += (mouseX-oldX);

        y += (mouseY-oldY);

    }

    else if(now==2){///旋轉

        angle += (mouseX-oldX);

    }

    else if(now==3){///縮放

        if( mouseX>oldX ) scale = scale * 1.01;

        if( mouseX<oldX ) scale = scale * 0.99;

    }

    oldX = mouseX; oldY = mouseY;

    display();

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutInitWindowSize(500, 500);

    glutCreateWindow("Week06 keyboard mouse motion");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}