OpenG實現(xiàn)畫線段與折線

OpenG實現(xiàn)畫線段與折#include<gl/glut.h>#include<stdlib.h>#defineNUM100//折線的最大折線段intFlag=0;//標(biāo)記與否已經(jīng)開始繪制折線intRFlag=//標(biāo)記與否已經(jīng)完畢一種矩形intFunction=//標(biāo)記選擇的功效是畫折線還是矩形intwinWidth=800,winHeight=intx,y;intn=0;//用于統(tǒng)計折線有幾段intm=0;structLineNodeintx1;inty1;intx2;intstructRectangleintx1;inty1;intx2;intstaticGLsizeiiMode=1;voidInitial(void){glClearColor(1.0f,1.0f,1.0f,1.0f);voidChangeSize(intw,inth){winWidth=w;winHeight=h;glViewport(0,0,w,h);//指定窗口顯示區(qū)域glMatrixMode(GL_PROJECTION);//指定設(shè)立投影參數(shù)glLoadIdentity();//調(diào)用單位矩陣，去掉以前的投影參數(shù)設(shè)立gluOrtho2D(0.0,winWidth,0.0,winHeight);voidrightClik(intvalue){Function=value;n=0;Flag=m=RFlag=0;}void{inti,glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);glClear(GL_COLOR_BUFFER_BIT);//用目前背景色填充窗口glColor3f(1.0f,0.0f,0.0f);//指定目前的繪圖顏色case3:}if(Function==1)for(i=0;i<n;i++){glBegin(GL_LINES);//繪制直線段glVertex2i(Line[i].x1,Line[i].y1);glVertex2i(Line[i].x2,Line[i].y2);}if(Flag==1){glVertex2i(Line[i].x1,Line[i].y1);glVertex2i(x,y);}}elsefor(j=0;j<m;j++)glRecti(Rect[j].x1,Rect[j].y1,Rect[j].x2,}if(RFlag==1){glRecti(Rect[j].x1,Rect[j].y1,x,}}glutSwapBuffers();}voidMousePlot(GLintbutton,GLintaction,GLintxMouse,GLint{if(Function==1)if(button==GLUT_LEFT_BUTTON&&action==GLUT_DOWN){if(Flag==0){Flag=Line[n].x1=Line[n].y1=winHeight-}elseLine[n].x2=Line[n].y2=winHeight-yMouse;Line[n].x1=Line[n-Line[n].y1=Line[n-}}}elseif(button==GLUT_LEFT_BUTTON&&action==GLUT_DOWN){if(RFlag==0){Rect[m].x1=Rect[m].y1=winHeight-}else{RFlag=0;Rect[m].x2=Rect[m].y2=winHeight-yMouse;}}}}voidPassiveMouseMove(GLintxMouse,GLint{x=y=winHeight-yMouse;}intmain(intargc,char*argv[]){glutInit(&argc,argv);glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);RGB模型glutInitWindowSize(400,300);//指定窗口的尺寸glutInitWindowPosition(100,100);intnFunctionMenu=glutCreateMenu(rightClik);glutAddMenuEntry("畫折線",1);glutAddMenuEntry("畫矩形",intnMainMenu=glutCreateMenu(rightClik);glutAttachMenu(GLUT_RIGHT_BUTTON);//右鍵glutReshapeFunc(ChangeSize);glut