帮助opengl项目 [英] help in opengl project

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本文介绍了帮助opengl项目的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我必须在3天内提交这个项目，请有人帮助我..在项目中，当用户按下推时，我用不同的颜色填充堆栈块然后要求用户输入字符..我通过键盘功能接受这个字符..然后使用glutpostredisplay来显示我最近推出不同颜色块的块中的字符。问题是，一次只显示字符或不同颜色的块。我想要一次显示两个..请帮帮我..



i have to submit this project in 3 days, please someone help me out..in the project im filling the stack block by a different colour when user presses "push"..and then asking the user to enter character..im accepting this character by keyboard function..then using "glutpostredisplay" to display the character in the block where i recently pushed a different coloured block..the problem is, only the character or the different coloured block is displayed at a time..i want both to be displayed at a time..pplease help me out..

#include
#include<stdio.h>

GLfloat s_v[20][2]={{300,20},{440,20},{300,70},{440,70},{300,120},{440,120},{300,170},{440,170},{300,220},{440,220},{300,270},{440,270},{300,320},{440,320},{300,370},{440,370},{300,420},{440,420},{300,480},{440,480}};

GLfloat pu_v[4][2]={{30,370},{30,420},{170,420},{170,370}};

GLfloat po_v[4][2]={{30,70},{30,120},{170,120},{170,70}};

static int i=0,j,oper=0,flow=0,k=0;
static char chr_ary[9];

void draw_push()
{
	char push[5]="PUSH";
	int iter;
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
	gluOrtho2D(0.0, 500, 0.0, 500);
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();
	glColor3f(0.0, 0.0, 0.0);
	glRasterPos2i(65, 385);
	void * font = GLUT_BITMAP_TIMES_ROMAN_24;
	for (iter=0;iter<5;iter++)
	{
		char c = push[iter];
		glutBitmapCharacter(font, c);
	}
}

void draw_pop()
{
	char pop[4]="POP";
	int iter;
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
	gluOrtho2D(0.0, 500, 0.0, 500);
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();
	glColor3f(0.0, 0.0, 0.0);
	glRasterPos2i(75, 85);
	void * font = GLUT_BITMAP_TIMES_ROMAN_24;
	for (iter=0;iter<4;iter++)
	{
		char c = pop[iter];
		glutBitmapCharacter(font, c);
	}
}

void draw_push_char_prompt()
{
    char push_prompt[35]="Enter the character to be pushed";
    int iter;
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    gluOrtho2D(0.0, 500, 0.0, 500);
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();
    glColor3f(0.0, 0.0, 0.0);
    glRasterPos2i(80, 240);
    void * font = GLUT_BITMAP_TIMES_ROMAN_24;
    for (iter=0;iter<35;iter++)
    {
        char c = push_prompt[iter];
        glutBitmapCharacter(font, c);
    }
}

void draw_push_char()
{
	int iter;
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    gluOrtho2D(0.0, 500, 0.0, 500);
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();
    glColor3f(1.0, 0.0, 0.0);
    void * font = GLUT_BITMAP_TIMES_ROMAN_24;
    for (iter=0;iter<k;iter++)>
	{
		glRasterPos2i(365, (40+50*(iter)));
		char c = chr_ary[iter];
		glutBitmapCharacter(font, c);
	}
}

void draw_overflow()
{
	char overflow[35]="STACK OVERFLOW! press 'q' to exit";
	int iter;
	flow=1;
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
	gluOrtho2D(0.0, 500, 0.0, 500);
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();
	glColor3f(0.0, 0.0, 0.0);
	glRasterPos2i(60, 240);
	void * font = GLUT_BITMAP_TIMES_ROMAN_24;
	for (iter=0;iter<35;iter++)
	{
		char c = overflow[iter];
		glutBitmapCharacter(font, c);
	}
}

void draw_underflow()
{
	char underflow[35]="STACK UNDERFLOW! press 'q' to exit";
	int iter;
	flow=1;
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
	gluOrtho2D(0.0, 500, 0.0, 500);
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();
	glColor3f(0.0, 0.0, 0.0);
	glRasterPos2i(50, 240);
	void * font = GLUT_BITMAP_TIMES_ROMAN_24;
	for (iter=0;iter<35;iter++)
	{
		char c = underflow[iter];
		glutBitmapCharacter(font, c);
	}
}

void draw_top_ptr()
{
	char top[4]="top";
	int iter;
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
	gluOrtho2D(0.0, 500, 0.0, 500);
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();
	glColor3f(1.0, 0.0, 0.0);
	glRasterPos2i(250, 0+(25*i));
	void * font = GLUT_BITMAP_TIMES_ROMAN_24;
	for (iter=0;iter<4;iter++)
	{
		char c = top[iter];
		glutBitmapCharacter(font, c);
	}
}

void frame_block(int a,int b,int c,int d)
{
	glBegin(GL_LINE_LOOP);
	glColor3f(1.0,0.0,0.0);
	glVertex2fv(s_v[a]);
	glVertex2fv(s_v[b]);
	glVertex2fv(s_v[c]);
	glVertex2fv(s_v[d]);
	glEnd();
}

void stack_frame()
{
	frame_block(0,2,3,1);
	frame_block(2,4,5,3);
	frame_block(4,6,7,5);
	frame_block(6,8,9,7);
	frame_block(8,10,11,9);
	frame_block(10,12,13,11);
	frame_block(12,14,15,13);
	frame_block(14,16,17,15);
	frame_block(16,18,19,17);
}

void push_button()
{
	glBegin(GL_POLYGON);
	glColor3f(0.0,1.0,0.6);
	glVertex2fv(pu_v[0]);
	glVertex2fv(pu_v[1]);
	glVertex2fv(pu_v[2]);
	glVertex2fv(pu_v[3]);
	glEnd();
}

void pop_button()
{
	glBegin(GL_POLYGON);
	glColor3f(1.0,0.3,0.6);
	glVertex2fv(po_v[0]);
	glVertex2fv(po_v[1]);
	glVertex2fv(po_v[2]);
	glVertex2fv(po_v[3]);
	glEnd();
}

void push_char()
{
    glBegin(GL_POLYGON);
    glColor3f(1.0,1.0,1.0);
    glVertex2f(40,300);
    glVertex2f(40,200);
    glVertex2f(460,200);
    glVertex2f(460,300);
    glEnd();
    draw_push_char_prompt();
}

void stack_overflow()
{
	glBegin(GL_POLYGON);
	glColor3f(0.8,1.0,0.0);
	glVertex2f(300,20);
	glVertex2f(440,20);
	glVertex2f(440,480);
	glVertex2f(300,480);
	glEnd();
	stack_frame();
	glBegin(GL_POLYGON);
	glColor3f(1.0,1.0,1.0);
	glVertex2f(50,300);
	glVertex2f(50,200);
	glVertex2f(450,200);
	glVertex2f(450,300);
	glEnd();
	draw_overflow();
	draw_push_char();
}

void stack_underflow()
{
	glBegin(GL_POLYGON);
	glColor3f(1.0,1.0,1.0);
	glVertex2f(40,300);
	glVertex2f(40,200);
	glVertex2f(460,200);
	glVertex2f(460,300);
	glEnd();
	draw_underflow();
}

void push(int a,int b,int c,int d)
{
	if(oper==1&&i<=16)
	{
		i=i+2;
		glBegin(GL_POLYGON);
		glColor3f(0.8,1.0,0.0);
		glVertex2fv(s_v[a]);
		glVertex2fv(s_v[b]);
		glVertex2fv(s_v[c]);
		glVertex2fv(s_v[d]);
		glEnd();
		stack_frame();
		oper=0;
	}
	if(oper==1&&i>16)
	{
		oper=0;
		stack_overflow();
	}
}

void pop(int a,int b,int c,int d)
{
	if(oper==2&&j>=0)
	{
		k--;
		i=i-2;
		glBegin(GL_POLYGON);
		glColor3f(0.8,1.0,0.0);
		glVertex2fv(s_v[a]);
		glVertex2fv(s_v[b]);
		glVertex2fv(s_v[c]);
		glVertex2fv(s_v[d]);
		glEnd();
		stack_frame();
		oper=0;
	}
	if(oper==2&&j<0)
	{
		oper=0;
		k--;
		i=0;
		stack_underflow();
	}
}

void mouse(int btn,int state,int x,int y)
{
	if(btn==GLUT_LEFT_BUTTON&&state==GLUT_DOWN&&30<x&&x><170&&80><y&&y><130)>
	{
		oper=1;
		glutPostRedisplay();
	}
	if(btn==GLUT_LEFT_BUTTON&&state==GLUT_DOWN&&30<x&&x><170&&380><y&&y><430)>
	{	oper=2;
		glutPostRedisplay();
	}
}

void keys(unsigned char key, int x,int y)
{
	if((flow==1)&&(key=='q'||key=='Q'))
		exit(0);
	else
		if(k<9)
		{
			chr_ary[k++]=key;
			glutPostRedisplay();
		}
}

void display()
{
	j=i-4;
	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	stack_frame();
	push_button();
	pop_button();
	draw_push();
	draw_pop();
	if(oper==1)
		push_char();
	push(0,2+i,3+i,1);
	pop(0,2+j,3+j,1);
	draw_push_char();
	draw_top_ptr();
	glutSwapBuffers();
}

static void resize(int width, int height)
{
    const float ar = (float) width / (float) height;
 
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0,500.0,0.0,500.0);
	glMatrixMode(GL_MODELVIEW);
    glLoadIdentity() ;
}

void main(int argc, char** argv)
{
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
	glutInitWindowSize(500,500);
	glutInitWindowPosition(0,0);
	glutCreateWindow("VISUALIZATION OF STACK");
	glutDisplayFunc(display);
	glutReshapeFunc(resize);
	glClearColor(0.0,0.0,0.0,1.0);
	glutMouseFunc(mouse);
	glRasterPos2i(100,120);
	glColor3f(1.0,0.0,0.0);
	glutKeyboardFunc(keys);
	glutMainLoop();
}

已添加代码块[/编辑]

Code block added[/Edit]

推荐答案

我在推送中观察到问题（）和 pop（）。这些函数负责绘制黄色块。

但它在绘制之前检查 oper 值。我刚刚修改了 push（）和 pop（），无论 oper如何绘制黄色块价值。



现在所有角色都会用红色绘制黄色背景..



I observed problem in push() and pop(). These functions are responsible to draw the yellow block.
But it checks the oper value before drawing. I just modified push() and pop(), to draw yellow blocks regardless of oper value.

Now all characters will draw in red with yellow background..

void push(int a,int b,int c,int d)
{
    if(oper==1&&i<=16)
    {
        i=i+2;
        oper=0;
    }
    if(i<=16)
    {
        glBegin(GL_POLYGON);
        glColor3f(0.8,1.0,0.0);
        glVertex2fv(s_v[a]);
        glVertex2fv(s_v[b]);
        glVertex2fv(s_v[c]);
        glVertex2fv(s_v[d]);
        glEnd();
        stack_frame();
    }
    if(oper==1&&i>16)
    {
        oper=0;
        stack_overflow();
    }

}

void pop(int a,int b,int c,int d)
{
    if(oper==2&&j>=0)
    {
        k--;
        i=i-2;
        oper=0;
    }
    if(j>=0)
    {
        glBegin(GL_POLYGON);
        glColor3f(0.8,1.0,0.0);
        glVertex2fv(s_v[a]);
        glVertex2fv(s_v[b]);
        glVertex2fv(s_v[c]);
        glVertex2fv(s_v[d]);
        glEnd();
        stack_frame();
    }
    if(oper==2&&j<0)
    {
        oper=0;
        k--;
        i=0;
        stack_underflow();
    }
}


这篇关于帮助opengl项目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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