[CODIGO FUENTE] Clase de dibujo interno OpenGL y D3D9

[c0de]

Hola,

hice esta clase simple e intuitiva para dibujar y generar texto para trucos internos de OpenGL. Es útil cuando estás haciendo un menú o aprendiendo OpenGL (cómo dibujar).
Primero queremos algunos headers:

#pragma once
#include <windows.h>
#include <gl\GL.h>
#pragma comment(lib, "opengl32.lib")

Luego la clase de dibujo:

class CDraw {
private:
    unsigned char r;
    unsigned char g;
    unsigned char b;

public:
    CDraw(unsigned char r, unsigned char g, unsigned char b) {
        this->r = r;
        this->g = g;
        this->b = b;
    }
  
    void FillRectangle(float x1, float y1, float x2, float y2) {
        ::glBegin(GL_POLYGON);
        ::glColor3ub(this->r, this->g, this->b);
        ::glVertex2f(x1, y1);
        ::glVertex2f(x2, y1);
        ::glVertex2f(x2, y2);
        ::glVertex2f(x1, y2);
        ::glEnd();
    }
  
    void Rectangle(float x1, float y1, float x2, float y2) {
        ::glBegin(GL_LINES);
        ::glColor3ub(this->r, this->g, this->b);
        ::glVertex2f(x1, y1);
        ::glVertex2f(x2, y1);
        ::glVertex2f(x2, y1);
        ::glVertex2f(x2, y2);
        ::glVertex2f(x2, y2);
        ::glVertex2f(x1, y2);
        ::glVertex2f(x1, y2);
        ::glVertex2f(x1, y1);
        ::glEnd();
    }

    void Line(float x1, float y1, float x2, float y2) {
        ::glBegin(GL_LINES);
        ::glColor3ub(this->r, this->g, this->b);
        ::glVertex2f(x1, y1);
        ::glVertex2f(x2, y2);
        ::glEnd();
    }
};

Como utilizar

CDraw colour(red,green,blue); //makes colour "brush"

colour.Rectangle(100.f,100.f,200.f,200.f); //draw rectangle with given coordinates
colour.Line(100.f,100.f,200.f,200.f); //draw line as diagonal in previous rect

colour.FillRectangle(200.f,100.f,300.f,200.f); //draw filled rect next to our picture

Ahora rendericemos algo de texto

La clase se ve así:

class CFont {
private:
    unsigned int base;
    unsigned char r;
    unsigned char g;
    unsigned char b;

public:
    CFont(int size, unsigned char r, unsigned char g, unsigned char b) {
        this->r = r;
        this->g = g;
        this->b = b;
        this->base = ::glGenLists(96);

        HDC hdc = ::wglGetCurrentDC();
        HFONT hFont = ::CreateFontA(-size, NULL, NULL, NULL, FW_MEDIUM, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_TT_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY, FF_DONTCARE | DEFAULT_PITCH, "Consolas");
        HFONT hOldFont = (HFONT)::SelectObject(hdc, hFont);

        ::wglUseFontBitmapsA(hdc, 32, 96, this->base);
        ::SelectObject(hdc, hOldFont);
        ::DeleteObject(hFont);
    }

    void Print(float x, float y, const char *format, ...) {
        ::glColor3ub(this->r, this->g, this->b);
        ::glRasterPos2f(x, y);

        char text[100];
        ::va_list args;

        va_start(args, format);
        ::vsprintf_s(text, 100, format, args);
        va_end(args);

        ::glPushAttrib(GL_LIST_BIT);
        ::glListBase(this->base - 32);
        ::glCallLists(::strlen(text), GL_UNSIGNED_BYTE, text);
        ::glPopAttrib();
    }
};

Ejemplo

CFont font(size,red,green,blue); //make "pen"

font.Print(100.f,100.f,"Hello World!"); //prints "Hello World!" string at (100,100) screen coordinates

Creditos
XdarionX