3-1：画点，连成线

// OPENGL.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

void init(void)

{

	glClearColor(1.0, 1.0, 0.0, 0.0);

	glMatrixMode(GL_PROJECTION);

	gluOrtho2D(-10.0, 10.0, -10.0, 10.0);

}

void lineSegment(void)

{

	glClear(GL_COLOR_BUFFER_BIT);

	glColor3f(0.0, 0.4, 0.2);

	glBegin(GL_LINES);

		glVertex2i(10,10);

		glVertex2i(-10,-10);

		glVertex2i(-10, 0);

		glVertex2i(10, 0);

		glVertex2i(0, -10);

		glVertex2i(0, 10);

	glEnd();

	glFlush();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

    glutInitWindowPosition(100,100);

    glutInitWindowSize(800, 400);

    glutCreateWindow("第一个OpenGL程序");

	init();//设置背景，坐标系

    glutDisplayFunc(lineSegment);//

    glutMainLoop();

    return 0;

}

4-1

// OPENGL.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#define Pi 3.1415926

void init(void)

{

	glClearColor(1.0, 1.0, 1.0, 0.0);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluOrtho2D(-200.0, 200.0, -200.0, 200.0);

}

//rho = a(1-sint(theta))

//x = a(1 - sin(t))*cos(t)

//y = a(1 - sin(t))*sin(t)

void circleDisplay(void)

{

	float t;

	glClear(GL_COLOR_BUFFER_BIT);

	srand((unsigned)time(NULL));

	glColor3f(1.0, 0.0, 0.0);

	glLineWidth(10.0);

	glBegin(GL_LINE_LOOP);

	    for (int i = 0; i < 1000; i++)

	    {

		    t = -1 * Pi / 2+ 2 * i * Pi / 1000;

		    glVertex2f(100*(1 - sin(t))*cos(t), 100*(1 - sin(t))*sin(t));

	    }

	glEnd();

	glFlush();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

    glutInitWindowPosition(50,100);

    glutInitWindowSize(800, 800);

    glutCreateWindow("第一个OpenGL程序");

	glClearColor(1.0, 1.0, 1.0, 0.0);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluOrtho2D(-200.0, 200.0, -200.0, 200.0);

	glutDisplayFunc(circleDisplay);

    glutMainLoop();

    return 0;

}

4-2

// OPENGL.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#define Pi 3.1415926

float a = 60.0;

void circleDisplay(void)

{

	double rr, gg, bb;

	float x, y;

	glClear(GL_COLOR_BUFFER_BIT);

	glColor3f(1.0, 0.0, 0.0);

	glLineWidth(5.0);

	//cout << "a=" << a << endl;

	glBegin(GL_LINE_STRIP);

	for (int i = 0; i <= 10000; i++)

	{

		x = -5 + 10.0 * i / 10000;

		glVertex2f(x, pow(x * x, 1.0 / 3.0) + 0.9 * sqrt(3.3 - x * x) * sin(a * Pi * x));

		//glVertex2f(x, x * x);

	}

	glEnd();

	glFlush();

}

void SpecialKeys(int key, int x, int y)

{

	if (key == GLUT_KEY_UP)

		a = a + 0.25;

	glutPostRedisplay();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

    glutInitWindowPosition(50,100);

    glutInitWindowSize(800, 800);

    glutCreateWindow("第一个OpenGL程序");

	glClearColor(1.0, 1.0, 1.0, 0.0);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluOrtho2D(-3.0, 3.0, -3.0, 3.0);

	glutDisplayFunc(circleDisplay);

	//glutSpecialFunc(SpecialKeys);

    glutMainLoop();

    return 0;

}

4-3:point

// OPENGL.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#define Pi 3.1415926

void init(void)

{

	glClearColor(1.0, 1.0, 1.0, 0.0);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluOrtho2D(-200.0, 200.0, -200.0, 200.0);

}

void circleDisplay(void)

{

	double rr, gg, bb;

	float x, y;

	glClear(GL_COLOR_BUFFER_BIT);

	srand((unsigned)time(NULL));

	glPointSize(10.0);

	glBegin(GL_POINTS);

	for (int i = 0; i < 1000; i++)

	{

		rr = rand() / double(RAND_MAX);

		gg = rand() / double(RAND_MAX);

		bb = rand() / double(RAND_MAX);

		x = (rand() % (400 + 1)) - 200;

		y = (rand() % (400 + 1)) - 200;

		glColor3d(rr, gg, bb);

		glVertex2f(x, y);

	}

	glEnd();

	glFlush();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

    glutInitWindowPosition(50,100);

    glutInitWindowSize(800, 800);

    glutCreateWindow("第一个OpenGL程序");

	glClearColor(1.0, 1.0, 1.0, 0.0);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluOrtho2D(-200.0, 200.0, -200.0, 200.0);

	glutDisplayFunc(circleDisplay);

    glutMainLoop();

    return 0;

}

5-1:bitmap显示字体

// OPENGL.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#define Pi 3.1415926

void init(void)

{

	glClearColor(1.0, 1.0, 1.0, 0.0);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluOrtho2D(-200.0, 200.0, -200.0, 200.0);

}

void circleDisplay(void)

{

	glClear(GL_COLOR_BUFFER_BIT);

	glColor3f(0.0, 0.0, 1.0);

	glRasterPos2i(0,0);

	glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, 'A');

	glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, 'B');

	glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, 'C');

	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'D');

	glFlush();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

    glutInitWindowPosition(50,100);

    glutInitWindowSize(800, 800);

    glutCreateWindow("第一个OpenGL程序");

	init();

	glutDisplayFunc(circleDisplay);

    glutMainLoop();

    return 0;

}

6-1:blending

// OPENGL.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#define Pi 3.1415926

int windowWidth = 600, windowHeight = 600;

void init(void)

{

	glClearColor(1.0, 1.0, 1.0, 1.0);

	glEnable(GL_BLEND);

	//glBlendFunc(GL_ONE, GL_ZERO);// sFactor, dFactor

	//glBlendFunc(GL_ZERO, GL_ONE);// sFactor, dFactor

	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	//glBlendFunc(GL_ONE, GL_ONE);

}

void myDisplay(void)

{

	glClear(GL_COLOR_BUFFER_BIT);

	glColor4f(1.0, 0.0, 0.0, 0.9);

	glRecti(-50, -50, 100, 100);

	glColor4f(0.0, 1.0, 0.0, 0.9);

	glRecti(-100, -100, 50, 50);

	glFlush();

}

void windowReshape(int w, int h)

{

	float aspectRatio;

	windowWidth = w;

	windowHeight = h;

	if (windowHeight == 0) windowHeight = 1;

	aspectRatio = (float)windowWidth / (float)windowHeight;

	glViewport(0, 0, windowWidth, windowHeight);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	if (windowWidth >= windowHeight)

		gluOrtho2D(-100.0*aspectRatio, 100.0*aspectRatio, -100.0, 100.0);

	else gluOrtho2D(-100.0, 100.0, -100.0 / aspectRatio, 100.0 / aspectRatio);

}

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

{

	glutInit(&argc, argv);

	glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);

	glutInitWindowPosition(100, 100);

	glutInitWindowSize(windowWidth, windowHeight);

	glutCreateWindow("第一个OpenGL程序");

	init();

	glutReshapeFunc(windowReshape);

	glutDisplayFunc(myDisplay);

	glutMainLoop();

	return 0;

}

6-2:reshape

// OPENGL.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#define Pi 3.1415926

int windowWidth = 600, windowHeight = 600;

void init(void)

{

	glClearColor(1.0, 1.0, 1.0, 1.0);

}

void myDisplay(void)

{

	glClear(GL_COLOR_BUFFER_BIT);

	glColor3f(1.0, 0.0, 0.0);

	glRectf(-50.0,-50.0, 50.0, 50.0);

	glFlush();

}

void windowReshape(int w, int h)

{

	float aspectRatio;

	windowWidth = w;

	windowHeight = h;

	aspectRatio = (float)windowWidth / (float)windowHeight;

	//if (windowHeight == 0) windowHeight = 1;

	//aspectRatio = (float)windowWidth / (float)windowHeight;

	glViewport(0, 0, windowWidth, windowHeight);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	if (windowWidth >= windowHeight)

		gluOrtho2D(-100.0*aspectRatio, 100.0*aspectRatio, -100.0, 100.0);

	else gluOrtho2D(-100.0, 100.0, -100.0 / aspectRatio, 100.0/aspectRatio);

}

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

{

    glutInit(&argc, argv);

	glutInitDisplayMode(GLUT_RGBA | GLUT_SINGLE);

    glutInitWindowPosition(100,100);

	glutInitWindowSize(windowWidth, windowHeight);

    glutCreateWindow("第一个OpenGL程序");

	init();

	glutReshapeFunc(windowReshape);

	glutDisplayFunc(myDisplay);

    glutMainLoop();

    return 0;

}

6-3:smooth

// OPENGL.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#define Pi 3.1415926

int windowWidth = 600, windowHeight = 600;

void init(void)

{

	glClearColor(1.0, 1.0, 1.0, 1.0);

	//glEnable(GL_BLEND);

	//glBlendFunc(GL_ONE, GL_ZERO);// sFactor, dFactor

	//glBlendFunc(GL_ZERO, GL_ONE);// sFactor, dFactor

	//glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	//glBlendFunc(GL_ONE, GL_ONE);

}

void myDisplay(void)

{

	double rr, gg, bb;

	float t, x, y;

	srand((unsigned)time(NULL));

	glClear(GL_COLOR_BUFFER_BIT);

	glShadeModel(GL_SMOOTH);

	glBegin(GL_POLYGON);

	glVertex2f(0.0, 0.0);

	for (int i = 0; i <= 20; i++)

	{

		rr = rand() / double(RAND_MAX);

		gg = rand() / double(RAND_MAX);

		bb = rand() / double(RAND_MAX);

		t = Pi *i / 20;

		x = 60.0*cos(t);

		y = 60.0*sin(t);

		glColor3d(rr, gg, bb);

		glVertex2f(x, y);

	}

	glEnd();

	glFlush();

}

void windowReshape(int w, int h)

{

	float aspectRatio;

	windowWidth = w;

	windowHeight = h;

	if (windowHeight == 0) windowHeight = 1;

	aspectRatio = (float)windowWidth / (float)windowHeight;

	glViewport(0, 0, windowWidth, windowHeight);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	if (windowWidth >= windowHeight)

		gluOrtho2D(-100.0*aspectRatio, 100.0*aspectRatio, -100.0, 100.0);

	else gluOrtho2D(-100.0, 100.0, -100.0 / aspectRatio, 100.0 / aspectRatio);

}

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

{

	glutInit(&argc, argv);

	glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);

	glutInitWindowPosition(100, 100);

	glutInitWindowSize(windowWidth, windowHeight);

	glutCreateWindow("第一个OpenGL程序");

	init();

	glutReshapeFunc(windowReshape);

	glutDisplayFunc(myDisplay);

	glutMainLoop();

	return 0;

}

7-1:antialiasing 消除锯齿

#include "stdafx.h"

#define Pi 3.1415926

int windowWidth = 600, windowHeight = 600;

void init(void)

{

	glClearColor(1.0, 1.0, 1.0, 1.0);

	glEnable(GL_LINE_SMOOTH);

	glEnable(GL_BLEND);

	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);

}

void myDisplay(void)

{

	glClear(GL_COLOR_BUFFER_BIT);

	glColor3f(0.0, 0.0, 1.0);

	glLineWidth(200.0);

	glBegin(GL_LINES);

	glVertex2i(-5, -1);

	glVertex2i(5, 1);

	glEnd();

	glFlush();

}

void windowReshape(int w, int h)

{

	float aspectRatio;

	windowWidth = w;

	windowHeight = h;

	aspectRatio = (float)windowWidth / (float)windowHeight;

	glViewport(0, 0, windowWidth, windowHeight);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	if (windowWidth >= windowHeight)

		gluOrtho2D(-10.0*aspectRatio, 10.0*aspectRatio, -10.0, 10.0);

	else gluOrtho2D(-10.0, 10.0, -10.0 / aspectRatio, 10.0 / aspectRatio);

}

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

{

	glutInit(&argc, argv);

	glutInitDisplayMode(GLUT_RGBA | GLUT_SINGLE);

	glutInitWindowPosition(100, 100);

	glutInitWindowSize(windowWidth, windowHeight);

	glutCreateWindow("第一个OpenGL程序");

	init();

	glutReshapeFunc(windowReshape);

	glutDisplayFunc(myDisplay);

	glutMainLoop();

	return 0;

}

7-2:fill area

#include "stdafx.h"

#define Pi 3.1415926

int windowWidth = 600, windowHeight = 600;

void init(void)

{

	glClearColor(1.0, 1.0, 1.0, 1.0);

}

void myDisplay(void)

{

	glClear(GL_COLOR_BUFFER_BIT);

	//glColor3f(1.0, 0.0, 0.0);

	//glBegin(GL_TRIANGLES);

	//glVertex2i(-50, -50);

	//glVertex2i(50, -50);

	//glVertex2i(0, 50);

	//glEnd();

	//glColor3f(1.0, 0.0, 0.0);

	//glBegin(GL_POLYGON);

	//glVertex2i(-50, 0); glVertex2i(-25, -50);

	//glVertex2i(25, -50); glVertex2i(50, 0);

	//glVertex2i(25, 50); glVertex2i(-25, 50);

	//glEnd();

	//glShadeModel(GL_SMOOTH);//GL_FLAT

	//glBegin(GL_TRIANGLES);

	//glColor3f(1.0, 0.0, 0.0); glVertex2i(-50, -50);

	//glColor3f(0.0, 1.0, 0.0); glVertex2i(50, -50);

	//glColor3f(0.0, 0.0, 1.0); glVertex2i(0, 50);

	//glEnd();

	//glShadeModel(GL_SMOOTH);//GL_FLAT

	//glBegin(GL_POLYGON);

	//glColor3ub(255, 0, 0); glVertex2i(-50, 0);

	//glColor3ub(255, 97, 0); glVertex2i(-25, -50);

	//glColor3ub(255, 255, 0); glVertex2i(25, -50);

	//glColor3ub(0, 255, 0); glVertex2i(50, 0);

	//glColor3ub(0, 255, 255); glVertex2i(25, 50);

	//glColor3ub(0, 0, 255); glVertex2i(-25, 50);

	//glEnd();

	//glShadeModel(GL_SMOOTH);//GL_FLAT

	//glBegin(GL_POLYGON);

	//glColor3ub(255, 0, 0); glVertex2i(-50, 0);

	//glColor3ub(255, 255, 0); glVertex2i(-25, -50);

	//glColor3ub(255, 255, 0); glVertex2i(25, -50);

	//glColor3ub(255, 0, 0); glVertex2i(50, 0);

	//glEnd();

	glFlush();

}

void windowReshape(int w, int h)

{

	float aspectRatio;

	windowWidth = w;

	windowHeight = h;

	aspectRatio = (float)windowWidth / (float)windowHeight;

	glViewport(0, 0, windowWidth, windowHeight);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	if (windowWidth >= windowHeight)

		gluOrtho2D(-100.0*aspectRatio, 100.0*aspectRatio, -100.0, 100.0);

	else gluOrtho2D(-100.0, 100.0, -100.0 / aspectRatio, 100.0 / aspectRatio);

}

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

{

	glutInit(&argc, argv);

	glutInitDisplayMode(GLUT_RGBA | GLUT_SINGLE);

	glutInitWindowPosition(100, 100);

	glutInitWindowSize(windowWidth, windowHeight);

	glutCreateWindow("第一个OpenGL程序");

	init();

	glutReshapeFunc(windowReshape);

	glutDisplayFunc(myDisplay);

	glutMainLoop();

	return 0;

}

7-3:line-type

// OPENGL.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#define Pi 3.1415926

void init(void)

{

	glClearColor(1.0, 1.0, 1.0, 1.0);

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluOrtho2D(-10.0, 10.0, -10.0, 10.0);

}

void circleDisplay(void)

{

	glClear(GL_COLOR_BUFFER_BIT);

	glEnable(GL_LINE_STIPPLE);

	glLineWidth(10.0f);

	glColor3f(0.0, 0.0, 0.0);

	glLineStipple(1, 0x0101);

	glBegin(GL_LINES);

	glVertex2f(-5.0,-5.0);

	glVertex2f(5.0, 5.0);

	glEnd();

	glFlush();

}

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

{

    glutInit(&argc, argv);

	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA);

    glutInitWindowPosition(50,100);

    glutInitWindowSize(800, 800);

    glutCreateWindow("第一个OpenGL程序");

	init();

	glutDisplayFunc(circleDisplay);

    glutMainLoop();

    return 0;

}

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