在Open GL Glut中绘制对象数组

问题描述

| 我一直在尝试为自己正在制作的游戏画多个球，我试图使其正常工作，但是我的init类和display方法类存在问题，我在错误所在的地方对此进行了评论。 Ball.h：

#pragma once
#include \"Vector2f.h\"
#include \"Vector3f.h\"

class Ball
{
private:
    Vector3f position;
    Vector3f veLocity;

public:
    Ball(void);
    ~Ball(void);

    void Draw();
    void SetPos(Vector3f New_position);
    void SetVel(Vector3f New_veLocity);
    Vector3f GetPos();
};

球cpp

#include \"Ball.h\"
#include \"Vector2f.h\"
#include \"Vector3f.h\"
#include \"glut/glut.h\"
#include \"GL/gl.h\"
#include \"GL/glu.h\"


Ball::Ball(void)
{
    Vector3f Temp_position;
    position = Temp_position;
    Vector3f Temp_veLocity;
    veLocity = Temp_veLocity;
}


Ball::~Ball(void)
{
}

void Ball::SetPos(Vector3f New_position)
{
    position = New_position;
}

void Ball::Draw()
{
    glPushmatrix();
    glTranslatef(position.X(),position.Y(),position.Z());
    glColor3d(1,0);
    glutSolidSphere(0.3,50,50);
    glPopMatrix();
}

void Ball::SetVel(Vector3f New_veLocity)
{
    veLocity = New_veLocity;
}

Vector3f Ball::GetPos()
{
    Vector3f temp;
    temp = position;
    return temp;
}

我希望能够在Main.cpp中绘制一组球

Main.cpp 

#include \"display.h\"
#include \"Vector3f.h\"
#include \"Ball.h\"
#include \"glut/glut.h\"
#include \"GL/gl.h\"
#include \"GL/glu.h\"
#include <math.h>



static float TableWidth = 4;  // Z axis normal = 4
float display::eyeX = -7.5; //-7.5
float display::eyeY = 3; //3
float display::eyeZ = 5; //5
float display::Position[4] = { 1.0f,0.0f,-3.5,1.0f };
float display::translateZ = -3.5;
float display::translateX = 0.0;
//Timer display::m_Timer = Timer();
float display::lightX = 5.0; //5 2.5
float display::lightY = 5.0;
float display::lightZ = 2.5;


float m_TableX = -5.0f;
float m_TableZ = -2.5f;
float m_TableWidth = 2.5f;
float m_TableLength = 5.0f;

float ballx = 0.7;
float bally = 0.1;
float ballz = -0.7;

Ball Redball;
float BALL_RED_START = 0;
float RADIUS_OF_BALL = 0.3;
float BALL_RED_END = 8;
float m_ball;




void display::Init(int argc,char ** argv)
{
    glutinit(&argc,argv); // initializes glut
    // sets display mode. These parameter set RGB colour model
    // and double buffering.
    glutinitwindowSize(500,500);
    glutinitdisplayMode(gluT_RGB | gluT_DOUBLE);
    glutCreateWindow(\"Pool Version 1.0\");


    // Set glut callback functions
    glutdisplayFunc(display::displayScene);
    glutIdleFunc(display::Idle);
    glutReshapeFunc(display::Resize);
    glutKeyboardFunc(display::KeyboardInput);
    //m_Timer.getSeconds();
    glEnable(GL_DEPTH_TEST);
    glPointSize(5);

        glEnable(GL_norMALIZE);
        glEnable(GL_LIGHTING);
        glClearColor(0,1);
        glEnable(GL_COLOR_MATERIAL);


float white[] = { 1.0f,1.0f,1.0f };
glLightfv(GL_LIGHT0,GL_DIFFUSE,white);

glEnable(GL_LIGHT0);
Redball.SetPos(Vector3f(0.0,0.3,0.0));

for(int i = BALL_RED_START; i < BALL_RED_START; i++)
{
  glColor3f(1,0);
  Redball[i]->SetPos(Vector3f (i+128,RADIUS_OF_BALL,45));  //I tried this but it doesn\'t work Error C2227
}



    // Begin glut main loop
    glutMainLoop();
}




void BallMovement()
{
    //Vector3f position(0.0,0.0);
    /*Redball.SetPos(Vector3f(0.0,0.0));*/
    Vector3f New_veLocity(0.01,0);
    Redball.SetVel(New_veLocity);

    Vector3f New_position;
    Vector3f Old_position;

    Old_position = Redball.GetPos();

    //New_position = Old_position + New_veLocity;

    New_position.SetX(Old_position.X() + New_veLocity.X());
    New_position.SetY(Old_position.Y() + New_veLocity.Y());
    New_position.SetZ(Old_position.Z() + New_veLocity.Z());


    Redball.SetPos(New_position);
}





void display::displayScene()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear the back buffer


    glPushmatrix();
    glLoadIdentity();
    glnormal3f(0,1,0);
    Vector3f didums = Redball.GetPos();
    gluLookAt(eyeX,eyeY,eyeZ,// eye position
            0,// what I\'m looking at
            0.0,1.0,0); // Up direction

    float Position[] = {lightX,lightY,lightZ,1.0f};
glLightfv(GL_LIGHT0,GL_POSITION,Position);
DrawLight(0,Position);



    /* Rendering code goes here */

for (int i = BALL_RED_START; i<BALL_RED_END;i++)
{
glColor3f(1,0);
Redball[i]->Draw();     //I tried this but it doesn\'t work Error C2227
}




drawTable();
drawTableLegFrontLeft();
drawTableLegFrontRight();
drawTableLegBackLeft();
drawTableLegBackRight();
drawCushions();
//drawCircle();
//drawHCircle();
Table(-2,-4.5,2,4.5); // Draws the table top in trianglestrip       -4.5,0.5,-0.5,9.5



    glPopMatrix();
    glutSwapBuffers(); // Swap the front and back buffers
}

void display::Resize(int w,int h)
{
    /* Resize is called when window is resized */
    glMatrixMode(GL_PROJECTION); // set matrix mode to profection
    // this dictates how the 3d scene is \"squashed\" onto the 2d screen
    glLoadIdentity();
    glViewport(0,w,h);  // Set the part of the window to use.
    gluPerspective(45,// field of view
                (float)w/(float)h,// ration of window
                1,// front clipping plane
                1000                // back clipping plane
                );          // set the area in the 3d scene to draw

    glMatrixMode(GL_MODELVIEW); // Setthe matrix mode to model view
        // the matrix specifies how the 3d scene is viewed
    /*glLoadIdentity();
    gluLookAt(-3.5,// eye position
            1,0); // Up direction*/
}




void display::Idle()
{
    /* When nothing else is happening,idle is called.
     * Simulation should be done here and then
     * the display method should be called
     */

    BallMovement();

    glutPostRedisplay();
}

    

解决方法

我看到您已经将

Ball

声明为

Ball Redball;

，这将在堆栈上创建一个Ball。 然后，您尝试将其视为具有

Redball[i]->SetPos(...)

和

Redball[i]->Draw()

的

Ball

的集合。您似乎正在尝试使用其中的8种。 您要做的是创建一个3个数组，最大大小为8（根据9个数组）。为简单起见，您可以

Ball RedBall[8];
for( //some conditions here )
{
    RedBall[i].Draw();
}

作为您的声明和用法。 请记住，您每次使用

Redball.SetPos(...)

都将不再有效。