图形学实验一
运行环境：
实验工程和配置：
点击下载实验工程
Windows 10
Visual Studio 2017 已配置lib和include文件夹
系统文件配置32和64位的OpenGL环境。
实验一 图形的 平移 缩放
鼠标左右击缩放，方向键控制移动。（一开始在左下角，所以容易看不见）
// test1.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#define GLUT_DISABLE_ATEXIT_HACK
#pragma comment(lib, "Ws2_32.lib")
#include <cmath>
#include <cstdlib>
#include <gl/glut.h>
float width, highth, angle;
void init(void)//画正方形
{
glClearColor(1.0, 1.0, 6.0, 1.0);//背景颜色
glMatrixMode(GL_PROJECTION);// 投影
gluOrtho2D(0.0, 600.0, 0.0, 600.0);//参数分别代表（左下角x坐标，右上角x坐标，左下角y坐标，右上角y坐标）
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.0, 1.0, 1.0);//矩形颜色
GLfloat
PointA[2] = { 0+width,50+highth },
PointB[2] = { 10 + width,10 + highth },
PointC[2] = { 50 + width,0 + highth },
PointD[2] = { 10 + width,-10 + highth },
PointE[2] = { 0 + width,-50 + highth },
PointF[2] = { -10 + width,-10 + highth },
PointG[2] = { -50 + width,0 + highth },
PointH[2] = { -10 + width,10 + highth };
glBegin(GL_LINE_LOOP);//闭合折线
glLineWidth(6.0);
glVertex2fv(PointA);
glVertex2fv(PointB);
glVertex2fv(PointC);
glVertex2fv(PointD);
glVertex2fv(PointE);
glVertex2fv(PointF);
glVertex2fv(PointG);
glVertex2fv(PointH);
glEnd();
glFlush();
}
void mySpecialKeyboard(int key, int x, int y)
{
if (key == GLUT_KEY_RIGHT)
width += 5;
if (key == GLUT_KEY_LEFT)
width -= 5;
if (key == GLUT_KEY_UP)
highth += 5;
if (key == GLUT_KEY_DOWN)
highth -= 5;
glutPostRedisplay();
}
void myKeyboard(unsigned char key, int x, int y)
{
glutPostRedisplay();
}
void mymouse(int button, int state, int x, int y)//鼠标控制缩放
{
if (state == GLUT_DOWN)
{
if (button == GLUT_LEFT_BUTTON)
{
glScalef(0.5, 0.5, 0.0);
display();
}
else if (button == GLUT_RIGHT_BUTTON)
{
glScalef(1.5, 1.5, 0.0);
display();
}
glutPostRedisplay();//重新调用绘制函数
}
return;
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowPosition(50, 50);
glutInitWindowSize(600, 600);
glutCreateWindow("王子源，152210708117，鼠标右键放大，方向键移动");
init();
glutDisplayFunc(display);
glutSpecialFunc(mySpecialKeyboard);
glutMouseFunc(&mymouse);
glutKeyboardFunc(myKeyboard);
glutMainLoop();
return 0;
}
实验一 图像的旋转
AS控制旋转方向
// test3.cpp: 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#define GLUT_DISABLE_ATEXIT_HACK
#pragma comment(lib, "Ws2_32.lib")
#include <cmath>
#include <cstdlib>
#include <gl/glut.h>
float DEG_TO_RAD = 0.0; //角度转为弧度的参数，即 2*PI/360
float theta = 30.0; //直线与X轴正方向的夹角
float length = 200.0; //直线的长度
float xf=300.0, yf = 200.0; //直线的第一个端点
void init(void)
{
glClearColor(1.0, 1.0, 1.0, 0.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.0, 640.0, 0.0, 480.0);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.0, 1.0, 1.0);
glBegin(GL_POLYGON);
glVertex2f(xf + (0)*cos(DEG_TO_RAD)- (200)*sin(DEG_TO_RAD), yf +(200)*cos(DEG_TO_RAD) +0*sin(DEG_TO_RAD));
glVertex2f(xf + (200)*cos(DEG_TO_RAD) - (0)*sin(DEG_TO_RAD), yf + (0)*cos(DEG_TO_RAD) + 200 * sin(DEG_TO_RAD));
glVertex2f(xf + (30)*cos(DEG_TO_RAD) + 30*sin(DEG_TO_RAD), yf - 30*cos(DEG_TO_RAD) + 30 * sin(DEG_TO_RAD));
glVertex2f(xf + (0)*cos(DEG_TO_RAD) + (200)*sin(DEG_TO_RAD), yf -(200)*cos(DEG_TO_RAD) + 0 * sin(DEG_TO_RAD));
glVertex2f(xf - 30*cos(DEG_TO_RAD) + (30)*sin(DEG_TO_RAD), yf - (30)*cos(DEG_TO_RAD) -30 * sin(DEG_TO_RAD));
glVertex2f(xf - 200*cos(DEG_TO_RAD) - (0)*sin(DEG_TO_RAD), yf + (0)*cos(DEG_TO_RAD) -200 * sin(DEG_TO_RAD));
glEnd();
glutSwapBuffers(); //交换前后台缓存
}
void myKeyboard(unsigned char key, int x, int y)
{
if (key == 'a' || key == 'A')
DEG_TO_RAD += 0.1;
if (key == 's' || key == 'S')
DEG_TO_RAD -= 0.1;
if (key == 'c' || key == 'C')
exit(0);
if (DEG_TO_RAD>360) DEG_TO_RAD -= 360;
if (DEG_TO_RAD<0) DEG_TO_RAD += 360;
glutPostRedisplay(); //重新调用绘制函数
}
void main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowPosition(100, 100);
glutInitWindowSize(680, 680);
glutCreateWindow("152210708117 A键左转，S键右转");
init();
glutDisplayFunc(display);
glutKeyboardFunc(myKeyboard);
// glutIdleFunc(idleFunc); //指定空闲回调函数
glutMainLoop();
}
