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Posted on 2003-11-04
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I got a question is I not confirm my code. I use object – oriental and OpenGL concept to draw a triangle. I got a Position class which store 3 float variable (x, y, z). Then I use the Triangle class which contain of array of 3 Position which contain the coordinate of the 3 vertices of Triangle. I use Driver.cpp to test my program (main class to control everything). Following is my code to test the program:

//Driver.cpp
#include <windows.h>
#include "Globals.h"
#include "OpenGLScene.h"
#include "MyOpenGLScene.h"
int WINAPI WinMain(HINSTANCE      hInstance,            // Instance
                  HINSTANCE      hPrevInstance,            // Previous Instance
                  LPSTR lpCmdLine,                  // Command Line Parameters
                  int nCmdShow)                  // Window Show State
{
      // Position accept 3 variable(x, y, z)
      Position* p1 = new Position(0.0f, 1.0f, -6.0f);
      // Position accept 3 variable(x, y, z)
      Position* p2 = new Position(-1.0f, -1.0f, -6.0f);
            // Position accept 3 variable(x, y, z)
      Position* p3 = new Position(1.0f, -1.0f, -6.0f);
      
      // because 3 Position for draw a Triangle
      Position* p[] = {p1, p2, p3};
      
      // Trianlge to store array of Position
      Triangle* myTriangle = new Triangle(*p);
      
      // add Triangle
      myStage->addTriangle(myTriangle);
      
      //run the code
      OpenGLScene* myStage = new MyOpenGLScene("Stage 1",800,600,16,0);
      myStage->start();
      return 0;
}

when I test addTriangle function then got this kind of error:
error C2440: '=' : cannot convert from 'class Position *(__thiscall Triangle::*)(void)' to 'class Position *' There is no context in which this conversion is possible

error C2440: '=' : cannot convert from 'float (__thiscall Position::*)(void)' to 'float'
        There is no context in which this conversion is possible

error C2440: '=' : cannot convert from 'float (__thiscall Position::*)(void)' to 'float'
        There is no context in which this conversion is possible

error C2440: '=' : cannot convert from 'float (__thiscall Position::*)(void)' to 'float'
        There is no context in which this conversion is possible

I think my code are stupid and then I don’t know how to make it simple and fix the error. Can someone check for me. Thanks!

Following is my other code:
// Triangle.cpp file
#include "MyOpenGLScene.h"

int i=0;
Triangle *triangle[50];
 
MyOpenGLScene::MyOpenGLScene(char* title, int width, int height, int bits, bool fullscreenflag):OpenGLScene(title, width, height, bits, fullscreenflag) { }
void MyOpenGLScene::addTriangle(Triangle *T) {
 triangle[i] = aTriangle[1];
 i++;
}
 
void MyOpenGLScene::DrawTriangle(Triangle *T) {
 Position *vertex;
 float vx, vy, vz;
 glBegin(GL_TRIANGLES);
  for(int i=0; i<3; i++) {
   vertex = T->getVertices;
   vx = vertex->getX;
   vy = vertex->getY;
   vz = vertex->getZ;
   glColor3f(1.0f,1.0f,1.0f);
   glVertex3f(vx, vy, vz);
  }
 glEnd();
}
 
int MyOpenGLScene::DrawGLScene() {
 this->DrawTriangle(T);
 return 0;
}
 
// Triangle.cpp file
#include "Triangle.h"

Triangle::Triangle(Position position[3]):red(1.0), green(1.0), blue(1.0) {
 this->position[0] = position[0];
 this->position[1] = position[1];
 this->position[2] = position[2];
}
void Triangle::setColor(float red, float green, float blue) {
 this->red = red;
 this->green = green;
 this->blue = blue;
}
float Triangle::getRed() {
 return red;
}
float Triangle::getGreen() {
 return green;
}
float Triangle::getBlue() {
 return blue;
}
Position* Triangle::getVertices() {
 return position;
}
// Position.cpp file
Position::Position() { }
Position::Position(float x, float y, float z) {
 this->x = x;
 this->y = y;
 this->z = z;
}
float Position::getX() {
 return x;
}
float Position::getY() {
 return y;
}
float Position::getZ() {
 return z;
}
 
From: Sally
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Question by:sally1980
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4 Comments
 
LVL 9

Accepted Solution

by:
_ys_ earned 80 total points
ID: 9679161
Start with this:

>> Triangle* myTriangle = new Triangle(*p);
Triangle* myTriangle = new Triangle (p);  // no '*'
0
 
LVL 13

Expert Comment

by:SteH
ID: 9679607
You use at some places Position* and later you need only Position.
To get an instance of Position use
Position p1(1,1,-6);
Now p needs to be declared as
Position p[3] and then you can continue with the tip of _ys_.
0
 
LVL 9

Expert Comment

by:tinchos
ID: 10242504
No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept: _ys_ {http:#9679161}

Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Tinchos
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