CPT-205 lab04 task

讲道理，半节课没上，在搞这个小游戏，直接上代码：

玩法：

就是个简单的吃金币的游戏，成功吃到以后人（会跳的小方块）会随机变一个颜色
金币每次到最左边（没吃到）以后会返回最右边，同时移动速度会随机变化
w键跳跃，s键让金币停止移动，m键让金币恢复运动，q退出游戏
无聊的小游戏，别玩太久。
原理代码注释里写挺多的，不再赘述了。
UI设计的比较丑，大家可以自己改一下代码里的颜色（doge

#define FREEGLUT_STATIC
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <GL/freeglut.h>
#include <iostream>
#include <cstdlib>
typedef struct { GLfloat x, y; } point; // define a 2D point
point p0 = { 400,200 }; // set initial co-ordinate values of the point  金币
point p1 = { 0,50 }; // set initial co-ordinate values of the point  小人
GLfloat finishx = 300; // declare position of vertical axis//Task 2
GLfloat jump = 0; //跳跃步长
GLfloat step = 10; //移动步长
GLint count = 0;
int time_interval = 16; // declare refresh interval in ms
void when_in_mainloop()
{ // idle callback functionglutPostRedisplay(); // force OpenGL to redraw the current window
}bool checkHug() {if ((p0.x >= 0 && p0.x <= 20 )&& (p1.y + 20 >= 200)) {return 1;}else return 0;
}void OnTimer(int value)
{   p0.x -= step; //移动步长if (p0.x >= 600)p0.x = 0;else if (p0.x <= 0) {p0.x = 599;step = rand()%10+5;//5以上的2位数}//反向则从另一侧刷新bool check = 0;check = checkHug();if (check == 1) {p0.x = 400; count++;}glutTimerFunc(time_interval, OnTimer, 1);
}bool flag = 0;void JumpOnTimer(int value) {if (flag==0 && p1.y <= 200) {p1.y += jump;if (p1.y == 200) {flag = 1;}}if (flag == 1 && p1.y>=50) {p1.y -= jump;if (p1.y ==50) {flag = 0;jump = 0;}}glutTimerFunc(time_interval, JumpOnTimer, 2);
}//Task 3
void keyboard_input(unsigned char key, int x, int y) // keyboard interactions
{if (key == 'q' || key == 'Q')exit(0);else if (key == 'w' || key == 'W') // change direction of movement{jump = 10;}else if (key == 's' || key == 'S') // stop movementstep = 0;else if (key == 'r' || key == 'R') // reset step (resume movement)p0.x=400;else if (key == 'm' || key == 'M') // reset step (resume movement)step = 2;
}//Task 4void display(void)
{glMatrixMode(GL_PROJECTION);glLoadIdentity();gluOrtho2D(0, 600, 0, 400);glClearColor(0, 0, 1, 1);glClear(GL_COLOR_BUFFER_BIT);glColor3f(1, 1, 1);glBegin(GL_LINES);glVertex2f(finishx, 50);glVertex2f(finishx, 350);glEnd();glColor3f(0, 1, 0);glBegin(GL_POLYGON);glVertex2f(0, 0);glVertex2f(0, 50);glVertex2f(600, 50);glVertex2f(600, 0);glEnd();glPolygonMode(GL_BACK, GL_FILL);           // 设置反面为填充方式// guyfor (int i = 0; i < count; i++){glColor3f(i & 0x04, i & 0x02, i & 0x01);}//glColor3f(1, 0, 0);glBegin(GL_POLYGON);glVertex2f(p1.x, p1.y);glVertex2f(p1.x, p1.y + 20);glVertex2f(p1.x + 20, p1.y + 20);glVertex2f(p1.x + 20, p1.y);glEnd();glPolygonMode(GL_FRONT, GL_LINE);            // 设置正面(顺时针)为边缘绘制方式glColor3f(0, 0, 0); glBegin(GL_POLYGON);glVertex2f(p1.x, p1.y);glVertex2f(p1.x + 20, p1.y);glVertex2f(p1.x + 20, p1.y + 20);glVertex2f(p1.x, p1.y + 20); //换为反向顺序glEnd();glPolygonMode(GL_BACK, GL_FILL);           // 设置正面为填充方式
// goldglColor3f(1, 1, 0);glBegin(GL_POLYGON);glVertex2f(p0.x, p0.y);glVertex2f(p0.x, p0.y + 10);glVertex2f(p0.x + 10, p0.y + 10);glVertex2f(p0.x + 10, p0.y);glEnd();glPolygonMode(GL_FRONT, GL_LINE);            // 设置反面为边缘绘制方式glColor3f(0, 0, 0); //黑色边框glBegin(GL_POLYGON);glVertex2f(p0.x, p0.y);glVertex2f(p0.x + 10, p0.y);glVertex2f(p0.x + 10, p0.y + 10);glVertex2f(p0.x, p0.y + 10);glEnd();glutSwapBuffers();
}
int main(int argc, char** argv)
{glutInit(&argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);glutInitWindowPosition(100, 100);glutInitWindowSize(600, 400);glutCreateWindow("My Interactive Window");glutDisplayFunc(display);//Task 2//Task 3glutIdleFunc(when_in_mainloop);/* glutIdleFunc sets the global idle callback to be func so a GLUT program can perform backgroundprocessing tasks or continuous animation when window system events are not being received.If enabled, the idle callback is continuously called when events are not being received. The callbackroutine has no parameters. The current window and current menu will not be changed before the idlecallback. Programs with multiple windows and/or menus should explicitly set the current window and/orcurrent menu and not rely on its current setting. The amount of computation and rendering done in an idlecallback should be minimized to avoid affecting the program's interactive response. In general, not morethan a single frame of rendering should be done in an idle callback.Assigning NULL to glutIdleFunc disables the generation of the idle callback. */glutTimerFunc(time_interval, OnTimer, 1);glutTimerFunc(time_interval, JumpOnTimer, 2);glutKeyboardFunc(keyboard_input); // keyboard callback functionglutMainLoop();
}

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