小呆瓜-第三週-滑鼠

 https://jsyeh.org/3dcg10/

下載 data/win32/glut32.dll

data放進win32

打開Transformation.exe

Mouse函式

#include <GL/glut.h>

float X=0,Y=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

        glTranslatef(X,Y,0);///移動

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

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

{

    X=(x-150)/150.0;

    Y=-(y-150)/150.0;///減一半,除一半

}

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

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week03");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMainLoop();

}

滑鼠幫忙畫圖

#include <GL/glut.h>

#include <stdio.h>

float X=0,Y=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

        glTranslatef(X,Y,0);///移動

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

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

{

    float X=(x-250)/250.0;

    float Y=-(y-250)/250.0;///減一半,除一半

    if(state==GLUT_DOWN)

    {

        printf("    glVertex2f(%.3f,%.3f);\n", X, Y);

    }

}

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

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutInitWindowSize(500,500);

    glutCreateWindow("week03");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMainLoop();

}