按GLUT中的按鈕更改背景顏色

一直遵循一些教程和其他人在此提出的問題。基本上試圖在按下換碼鍵時使背景顏色變成另一種顏色。按GLUT中的按鈕更改背景顏色

用整個代碼編輯帖子。

#include "stdafx.h" 
#include <glut.h> 


void render(void); 
void keyboard(int key, int x, int y); 

int main(int argc, char** argv) { 
    glutInit(&argc, argv); 
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA); 
    glutInitWindowPosition(100, 100); //Position of the window 
    glutInitWindowSize(620, 440); //Screen Size 
    glClearColor (0.0, 1.0, 0.0, 0.0); 
    glutCreateWindow("Greeting Card"); //Creates the window and names it 

    glEnable(GL_BLEND);         
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // Enables Alpha channel 
    glutDisplayFunc(render); 
    glutDisplayFunc(draw); 
    glutKeyboardFunc(keyboard); 
    glutMainLoop(); //Finished, now render 
    } 

void keyboard (unsigned char key, int x, int y) 
{ 
    GLfloat colors[][3] = { { 0.0f, 0.0f, 1.0f}, {1.0f, 0.0f, 0.0f } }; 
    static int back; 

    switch (key) { 
    case 27: 
     exit(0); 
    default: 
     back ^= 1; 
     glClearColor(colors[back][0], colors[back][1], colors[back][2], 1.0f); 
     glutPostRedisplay(); 
    } 
} 

void render(void) { 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 


    // World Snow // 
    glPushMatrix(); 
    glTranslatef(0, -0.35, 0); //Position of the shape 

     glBegin(GL_POLYGON); //Defines the type of shape 
     glColor3f(1, 1,1); //Colour of the shape 'RED, GREEN, BLUE' 
     glVertex2f(-1.5,-0.7); //Vertex 2F Gives the vertex some coords 

     glColor3f(1, 1, 1); 
     glVertex2f(-1.5, 0.7); 

     glColor3f(1, 1, 1); 
     glVertex2f(1.5, 0.7); 

     glColor3f(1, 1, 1); 
     glVertex2f(1.5,-0.7); 
     glEnd(); 
     glPopMatrix(); 
     glFlush(); 

    // Grey gradient world 
     glPushMatrix(); 
    glTranslatef(0, -0.35, 0); 

     glBegin(GL_POLYGON); 
     glColor3f(1, 1, 1); 
     glVertex2f(-1.5,-0.7); 

     glColor3f(1, 1, 1); 
     glVertex2f(-1.5, 0.7); 

     glColor3f(0.658824, 0.658824, 0.658824); 
     glVertex2f(1.5, 0.7); 

     glColor3f(1, 1, 1); 
     glVertex2f(1.5,-1.7); 
     glEnd(); 
     glPopMatrix(); 
     glFlush(); 


    // Top of the first Tree // 
    glPushMatrix(); 
    glTranslatef(-0.6, 0.5, 0); 
    glBegin(GL_TRIANGLES); //Defines the shape as being a triangle 


     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(-0.1, -0.1); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.1, -0.1); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.0, 0.1); 
      glEnd(); 
     glPopMatrix(); 


// Middle of the first tree 


    glPushMatrix(); 
    glTranslatef(-0.6, 0.4, 0); 
    glBegin(GL_TRIANGLES);       
     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(-0.1, -0.1); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.1, -0.1); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.0, 0.1); 

    glEnd(); 
    glPopMatrix(); 


    // Bottom of the first tree 

    glPushMatrix(); 
    glTranslatef(-0.6, 0.3, 0); 
    glBegin(GL_TRIANGLES);       
     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(-0.1, -0.1); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.1, -0.1); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.0, 0.1); 

    glEnd(); 
    glPopMatrix(); 
    glFlush(); 


    //Stump of first tree 

    glPushMatrix(); 
    glTranslatef(-0.6, 0.16, 0); 

    glBegin(GL_POLYGON); 
     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.02,-0.04); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.02, 0.04);       

     glColor3f(0.647059, 0.164706, 0.164706); 
     glVertex2f(0.02, 0.04); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(0.02,-0.04); 


    glEnd(); 
    glPopMatrix(); 

    // Large Tree TOP 
     glPushMatrix(); 
    glTranslatef(-0.2, 0, 0); 
    glBegin(GL_TRIANGLES);       
     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(-0.15, -0.15); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.15, -0.15); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.0, 0.15); 

    glEnd(); 
    glPopMatrix(); 
    glFlush(); 

    //Large Tree MIDDLE 
    glPushMatrix(); 
    glTranslatef(-0.2, -0.15, 0); 
    glBegin(GL_TRIANGLES);       
     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(-0.15, -0.15); 

     glColor3f(0.137255, 0.556863,0.137255);; 
     glVertex2f(0.15, -0.15); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.0, 0.15); 

    glEnd(); 
    glPopMatrix(); 
    glFlush(); 

    //Large Tree Bottom 
    glPushMatrix(); 
    glTranslatef(-0.2, -0.30, 0); 
    glBegin(GL_TRIANGLES);       
     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(-0.15, -0.15); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.15, -0.15); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.0, 0.15); 

    glEnd(); 
    glPopMatrix(); 
    glFlush(); 

    //Smaller tree Top 
    glPushMatrix(); 
    glTranslatef(0.05, 0.45, 0); 
    glBegin(GL_TRIANGLES);       
     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(-0.05, -0.05); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.05, -0.05); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.0, 0.05); 

    glEnd(); 
    glPopMatrix(); 
    glFlush(); 

    //Smaller tree MIDDLE 
    glPushMatrix(); 
    glTranslatef(0.05, 0.40, 0); 
    glBegin(GL_TRIANGLES);       
     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(-0.05, -0.05); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.05, -0.05); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.0, 0.05); 

    glEnd(); 
    glPopMatrix(); 
    glFlush(); 

    //smaller tree bottom 
     glPushMatrix(); 
    glTranslatef(0.05, 0.50, 0); 
    glBegin(GL_TRIANGLES);       
     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(-0.05, -0.05); 

     glColor3f(0.137255, 0.556863,0.137255); 
     glVertex2f(0.05, -0.05); 

     glColor3f(0.32, 0.49, 0.46); 
     glVertex2f(0.0, 0.05); 

    glEnd(); 
    glPopMatrix(); 
    glFlush(); 

    //Stump of smaller tree 
    glPushMatrix(); 
    glTranslatef(0.05, 0.32, 0); 
     glBegin(GL_POLYGON); 
     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.01,-0.03); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.01, 0.03);       

     glColor3f(0.647059, 0.164706, 0.164706); 
     glVertex2f(0.01, 0.03); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(0.01,-0.03); 

     glEnd(); 
    glPopMatrix(); 

    //Stump of MAIN tree 

     glPushMatrix(); 
    glTranslatef(-0.2, -0.50, 0); 
     glBegin(GL_POLYGON); 
     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.02,-0.05); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.02, 0.05);       

     glColor3f(0.647059, 0.164706, 0.164706); 
     glVertex2f(0.02, 0.05); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(0.02,-0.05); 

     glEnd(); 
    glPopMatrix(); 

    // Red Present 
    glPushMatrix(); 
    glTranslatef(0, -0.5, 0); 
     glBegin(GL_POLYGON); 

     glColor3f(1, 0, 1); 
     glVertex2f(-0.04,-0.05); 

     glColor3f(1, 0, 0); 
     glVertex2f(-0.04, 0.05); 

     glColor3f(1, 0, 0); 
     glVertex2f(0.04, 0.05); 

     glColor3f(1, 0, 0); 
     glVertex2f(0.04,-0.05); 
     glEnd(); 
    glPopMatrix(); 

    //Blue Present 
    glPushMatrix(); 
    glTranslatef(-0.2, -0.7, 0); 
     glBegin(GL_POLYGON); 

     glColor3f(0, 0, 1); 
     glVertex2f(-0.07,-0.06); 

     glColor3f(0, 0, 1); 
     glVertex2f(-0.07, 0.06); 

     glColor3f(0, 0, 1); 
     glVertex2f(0.07, 0.06); 

     glColor3f(0.196078, 0.6, 0.8); 
     glVertex2f(0.07,-0.06); 
     glEnd(); 
    glPopMatrix(); 


    // BLUE Ribbon RED present VERT 
     glPushMatrix(); 
    glTranslatef(0, -0.5, 0); 
     glBegin(GL_POLYGON); 

     glColor3f(0, 0, 1); 
     glVertex2f(-0.04,-0.01); 

     glColor3f(0, 0, 1); 
     glVertex2f(-0.04, 0.01); 

     glColor3f(0, 0, 1); 
     glVertex2f(0.04, 0.01); 

     glColor3f(0, 0, 1); 
     glVertex2f(0.04,-0.01); 
     glEnd(); 
     glPopMatrix(); 

     //BLUE ribbon RED present HORIZ 
     glPushMatrix(); 
    glTranslatef(0, -0.5, 0); 
     glBegin(GL_POLYGON); 

     glColor3f(0, 0, 1); 
     glVertex2f(-0.01,-0.05); 

     glColor3f(0, 0, 1); 
     glVertex2f(-0.01, 0.05); 

     glColor3f(0, 0, 1); 
     glVertex2f(0.01, 0.05); 

     glColor3f(0, 0, 1); 
     glVertex2f(0.01,-0.05); 
     glEnd(); 
     glPopMatrix(); 

     //Yellow Ribbon Blue Present VERT 
     glPushMatrix(); 
    glTranslatef(-0.2, -0.7, 0); 
     glBegin(GL_POLYGON); 

     glColor3f(0.6, 0.8, 0.196078); 
     glVertex2f(-0.07,-0.01); 

     glColor3f(0.6, 0.8, 0.196078); 
     glVertex2f(-0.07, 0.01); 

     glColor3f(0.6, 0.8, 0.196078); 
     glVertex2f(0.07, 0.01); 

     glColor3f(0.6, 0.8, 0.196078); 
     glVertex2f(0.07,-0.01); 
     glEnd(); 
     glPopMatrix(); 


     // BLUE present YELLOW ribbon VERT 
      glPushMatrix(); 
    glTranslatef(-0.2, -0.7, 0); 
     glBegin(GL_POLYGON); 

     glColor3f(0.6, 0.8, 0.196078); 
     glVertex2f(-0.01,-0.06); 

     glColor3f(0.6, 0.8, 0.196078); 
     glVertex2f(-0.01, 0.06); 

     glColor3f(0.6, 0.8, 0.196078); 
     glVertex2f(0.01, 0.06); 

     glColor3f(0.6, 0.8, 0.196078); 
     glVertex2f(0.01,-0.06); 
     glEnd(); 
     glPopMatrix(); 


     //Sign Post 
    glPushMatrix(); 
    glTranslatef(0.5, -0.1, 0); 
     glBegin(GL_POLYGON); 
     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.02,-0.25); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.02, 0.25);       

     glColor3f(0.35, 0.16, 0.14); 
     glVertex2f(0.02, 0.25); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(0.02,-0.25); 
     glEnd(); 
     glPopMatrix(); 


     //Sign, Attatched to the post 
    glPushMatrix(); 
    glTranslatef(0.5, -0.001, 0); 
     glBegin(GL_POLYGON); 
     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.15,-0.10); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(-0.15, 0.10);       

     glColor3f(0.35, 0.16, 0.14); 
     glVertex2f(0.15, 0.10); 

     glColor3f(0.36, 0.25, 0.20); 
     glVertex2f(0.15,-0.10); 
     glEnd(); 
     glPopMatrix(); 

    //Moon 
    glPushMatrix(); 
    glTranslatef(-0.9, 0.90, 0); 
    glBegin(GL_POLYGON); 
     glColor4f(0.90, 0.91, 0.98, 1); //RGBA 
     glVertex2f(-0.10,-0.2); 

     glColor4f(0.329412, 0.329412, 0.329412, 1); 
     glVertex2f(-0.10, 0.2);       

     glColor4f(0.90, 0.91, 0.98, 1); 
     glVertex2f(0.10, 0.2); 
     glColor4f(0.90, 0.91, 0.98, 1);   
     glVertex2f(0.10,-0.2); 
    glEnd(); 
    glPopMatrix(); 

    //MAIN PRESENT UNDER SIGN 
    glPushMatrix(); 
    glTranslatef(0.5, -0.6, 0); 
     glBegin(GL_POLYGON); 

     glColor3f(0.89, 0.47, 0.20); 
     glVertex2f(-0.20,-0.20); 

     glColor3f(0.89, 0.47, 0.20); 
     glVertex2f(-0.20, 0.20); 

     glColor3f(0.89, 0.47, 0.20); 
     glVertex2f(0.20, 0.20); 

     glColor3f(1.0, 0.25, 0); 
     glVertex2f(0.20,-0.20); 
     glEnd(); 
    glPopMatrix(); 

    //Orange Present Purple Ribbon VERT 
      glPushMatrix(); 
    glTranslatef(0.5, -0.6, 0); 
     glBegin(GL_POLYGON); 

     glColor3f(0.73, 0.16, 0.96); 
     glVertex2f(-0.20,-0.06); 

     glColor3f(0.73, 0.16, 0.96); 
     glVertex2f(-0.20, 0.06); 

     glColor3f(0.87, 0.58, 0.98); 
     glVertex2f(0.20, 0.06); 

     glColor3f(0.87, 0.58, 0.98); 
     glVertex2f(0.20,-0.06); 
     glEnd(); 
     glPopMatrix(); 


     //Orange Present Purple Ribbon HORIZ 
     glTranslatef(0.5, -0.6, 0); 
     glBegin(GL_POLYGON); 

     glColor3f(0.87, 0.58, 0.98); 
     glVertex2f(-0.06,-0.20); 

     glColor3f(0.87, 0.58, 0.98); 
     glVertex2f(-0.06, 0.20); 

     glColor3f(0.73, 0.16, 0.96); 
     glVertex2f(0.06, 0.20); 

     glColor3f(0.73, 0.16, 0.96); 
     glVertex2f(0.06,-0.20); 
     glEnd(); 
     glPopMatrix(); 
     glFlush(); 


     //'North Pole' TEXT sign 
    glPushMatrix(); 
    glLoadIdentity(); 
    glTranslatef(0.360, -0.010, 0); 
    glRotatef(90,0.0f,0.0f,0.0f); 
    glColor3f(0.0, 0.0, 0.0); //Colour is black 
    glRasterPos3i(10,100,1); 

    char text[50]="North Pole"; //Text 

    for(int i=0; i<50; i++) 

    { 
     glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,(int)text[i]); 
    } 
    glPopMatrix(); 

      glutSwapBuffers(); 
}

來源

2013-12-10 Siyico

你的'render'和'draw'函數在哪裏？ – Vallentin

渲染函數低於我發佈的代碼，我沒有繪製函數，我應該有嗎？ – Siyico

當項目很小時，請發佈您的整個代碼。好吧...是的？你可以調用'glutDisplayFunc（draw）'來告訴GLUT你使用'draw'函數作爲顯示函數。 – Vallentin

要把它當您按下Esc鍵背景顏色變爲另一種顏色。

那你爲什麼exit() ING當你按下它？交換你的case 27:和default:邏輯。

通過render()每次重置您的投影/模型觀察矩陣：

void render() 
{ 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 

    glMatrixMode(GL_MODELVIEW); 
    glLoadIdentity(); 
    ...

你也有一個未匹配的「橙色目前紫綬HORIZ」 glPopMatrix()：

//Orange Present Purple Ribbon HORIZ 
glTranslatef(0.5, -0.6, 0); 
glBegin(GL_POLYGON); 

glColor3f(0.87, 0.58, 0.98); 
glVertex2f(-0.06,-0.20); 

glColor3f(0.87, 0.58, 0.98); 
glVertex2f(-0.06, 0.20); 

glColor3f(0.73, 0.16, 0.96); 
glVertex2f(0.06, 0.20); 

glColor3f(0.73, 0.16, 0.96); 
glVertex2f(0.06,-0.20); 
glEnd(); 
glPopMatrix(); 
^^^^^^^^^^^^^ wha-hey?

除了那些背景切換似乎工作的東西。

來源

2013-12-10 06:21:06 genpfault

按GLUT中的按鈕更改背景顏色

回答

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