[問題] 一題opengl的程式

看板C_and_CPP作者valerieshu (Valerie)時間15年前 (2010/10/17 17:08)推噓0(0推 0噓 12→)

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遇到的問題： (題意請描述清楚) 畫出碎形，原本是一個藍色正方型，之後將每個邊都切成三等份然後一直重覆，依據輸入者輸入的數字，遞迴切那麼多次，不過最多只能三次我遇到的問題是，跑不出來連那個最外面的大正方型(就是完全沒有不需要進入遞迴的狀況)都無法出現只出現藍色外框，沒有填入顏色 --------------- | | | | | 白 |藍 | 白 | |----| |----| | | | 藍黃藍 | |---- -----| | | | | | 白 |藍 | 白 | | | | | --------------- 希望得到的正確結果：依據輸入者的輸入跑出碎形 --------------- | | | | | 白 |藍 | 白 | |----| |----| | | | 藍黃藍 | |---- -----| | | | | | 白 |藍 | 白 | | | | | --------------- 程式跑出來的錯誤結果：沒有錯誤，一樣能跑，只是只出現藍框開發平台： VC 2008 有問題的code： (請善用置底文標色功能) // hw1.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include<GL/glut.h> unsigned char bottom; int countLeft; int countTop; int countCentral; int countBottom; int countRight; class vertex(){ GLfloat x; GLfloat y; vertex(){x=0.0f; y=0.0f}; //constructor }; void SetupRC(void){ //set up the reandering state glClearColor(1.0f, 1.0f, 1.0f, 1.0f); } void RenderFirstScene(void){ //creat to draw scene glClear(GL_COLOR_BUFFER_BIT); glColor3f(0.0f, 0.0f, 1.0f); glRectf(20.0f, 230.0f, 230.0f, 20.0f); glFlush(); //flush drawing commands } void Keyboard(unsigned char bottom){ switch(bottom){ case 1: RenderRestScene(bottom); break; case 2: RenderResScene(bottom); break; case 3: RenderRestScene(bottom); break; default: break: } } void RenderRestScene(unsigned char bottom){ vertex a, b, c, d; a.x=20.0f; a.y=20.0f; b.x=230.0f; b.y=20.0f; c.x=230.0f; c.y=230.0f; d.x=20.0f; d.y=230.0f; countLeft=(int) bottom; countTop=(int) bottom; countCentral=(int) bottom; countBottom=(int) bottom; countRight=(int) bottom; EdgeCut(a, b, c, d); } void EdgeCut(vertex v1, vertex v2, vertex v3, vertex v4){ --countLeft; --countTop; --countCentral; --countBottom; --countRight; vertex left1, left2, right1, right2, bottom1, bottom2, top1, top2, central1, central2, central3, central4; left1.x = v1.x; left1.y = v1.y+((v1.y+ v4.y)/3); left2.x = v1.x; left2.y = v1.y+2*((v1.y+ v4.y)/3); right1.x = v2.x; right1.y = v1.y+((v1.y+ v4.y)/3); right2.x = v2.x; right2.y = v1.y+2*((v1.y+ v4.y)/3); bottom1.x = v1.x+((v1.x+ v2.x)/3); bottom1.y = v1.y; bottom2.x = v1.x+2*((v1.x+ v2.x)/3); bottom1.y = v1.y; top1.x = v1.x+((v1.x+ v2.x)/3); top1.y = v4.y; top2.x = v1.x+2*((v1.x+ v2.x)/3); top2.y = v4.y; central1.x = v1.x+((v1.x+ v2.x)/3); central1.y = v1.y+((v1.y+ v4.y)/3); central2.x = v1.x+2*((v1.x+ v2.x)/3); central1.y = v1.y+((v1.y+ v4.y)/3); central3.x = v1.x+2*((v1.x+ v2.x)/3); central3.y = v1.y+2*((v1.y+ v4.y)/3); central4.x = v1.x+((v1.x+ v2.x)/3); central4.y = v1.y+2*((v1.y+ v4.y)/3); glColor3f(0.0f, 0.0f, 1.0f); //set current drawing color to blue //draw a filled rectangle with current color glRectf(v1.x, v1.y+2*((v1.y+ v4.y)/3), v1.x+((v1.x+ v2.x)/3), v1.y+((v1.y+ v4.y)/3)); //left glRectf(v1.x+((v1.x+ v2.x)/3), v1.y+((v1.y+ v4.y)/3), v1.x+2*((v1.x+ v2.x)/3), v1.y); //bottom glRectf(v1.x+2*((v1.x+ v2.x)/3), v1.y+2*((v1.y+ v4.y)/3), v2.x, v1.y+((v1.y+ v4.y)/3)); //right glRectf(v1.x+((v1.x+ v2.x)/3), v4.y, v1.x+2*((v1.x+ v2.x)/3), v1.y+2*((v1.y+ v4.y)/3)); //top glColor3f(1.0f, 1.0f, 0.0f); //set current drawing color to yellow //draw a filled rectangle with current color glRectf(v1.x+((v1.x+ v2.x)/3), v1.y+2*((v1.y+ v4.y)/3), v1.x+2*((v1.x+ v2.x)/3), v1.y+((v1.y+ v4.y)/3)); //central glColor3f(1.0f, 1.0f, 0.0f); //set current drawing color to white //draw a filled rectangle with current color glRectf(v1.x, v4.y, v1.x+((v1.x+ v2.x)/3), v1.y+2*((v1.y+ v4.y)/3)); //upper left glRectf(v1.x+2*((v1.x+ v2.x)/3), v4.y, v2.x, v1.y+2*((v1.y+ v4.y)/3)); //upper right glRectf(v1.x, v1.y+((v1.y+ v4.y)/3), v1.x+((v1.x+ v2.x)/3), v1.y); //lower left glRectf(v1.x+2*((v1.x+ v2.x)/3), v1.y+((v1.y+ v4.y)/3), v2.x, v2.y); //lower right if(countLeft>0) EdgeCut(left1, central1, central2, left2); if(countTop>0) EdgeCut(central4, central3, top2, top1); if(countCentral>0) EdgeCut(central1, central2, cnetral3, central4); if(countBottom>0) EdgeCut(bottom1, bottom2, central2, central1); if(countRight>0) EdgeCut(central2, right1, right2, central3); } void ChangeSize(GLsizei w, GLsizei h){ //called by GLUT library when the windows has changed size if(h==0) //prevent a divide by zero h=1; glViewport(0, 0, w, h); //set viewport to windows dimensions glMatrixMode(GL_PROJECTION); //reset coordinate system glLoadIdentity(); if(w<=h) //established clipping volumn(left, right, bottom, top, near, far) glOrtho(0.0f, 250.0f, 0.0f, 250.0f*h/w, 1.0, -1.0); else glOrtho(0.0f, 250.0f*w/h, 0.0f, 250.0f, 1.0, -1.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } int main(){ //main program entry point glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); glutCreateWindow("hw1"); glutDisplayFunc(RenderFirstScene); glutKeyboardFunc(Keyboard); gluDisplayFunct(RenderRestScene); glutReshapeFunc(ChangeSize); SetupRC(); glutMainLoop(); } 補充說明：有點複雜看，不過希望大家能幫我 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 112.104.62.127

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