如何实现通过鼠标的点击进行正交投影和透视投影间的切换

weixin_41288181 2018-10-15 12:12:19
我想实现通过鼠标或者键盘进行正交和透视投影的切换，我的reshape函数如下：
其中正交的和透视的都写出来了，但是不知道如何通过鼠标来切换


void Reshape(int w1, int h1) {

	 

	WinWidth = w1;

	WinHeight = h1;

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	 

	glViewport(0, 0, w1, h1);

	gluPerspective(70, 1.0*w1 / h1, 1, 1000);//透视

	glOrtho(-30.0f, 30.0f, -30.0f, 30.0f, -60.0f, 60.0f);//正交

	glMatrixMode(GL_MODELVIEW);

	glLoadIdentity();

}

下面是源码，在mymouse那个函数里不知道怎么写。。。


#include "stdafx.h"

#include <GL/glut.h>

#include <math.h>

#include <time.h>

#include <stdio.h>



int WinWidth, WinHeight;

double posX, posY, posZ, viewX, viewY, viewZ, upX, upY, upZ;

const GLfloat PI = 3.141515926;



void setAll(double px, double py, double pz,

	double vx, double vy, double vz,

	double ux, double uy, double uz)

{

	posX = px;

	posY = py;

	posZ = pz;

	viewX = vx;

	viewY = vy;

	viewZ = vz;

	upX = ux;

	upY = uy;

	upZ = uz;

}



void setLookAt() {

	gluLookAt(posX, posY, posZ,

		viewX, viewY, viewZ,

		upX, upY, upZ);

}



void setPos(double x, double y, double z) {

	posX = x;

	posY = y;

	posZ = z;

}



void DisplayBox() {

	 

	GLfloat x, y, angle;

	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(0.0f, 7.5f, 0.0f);



	int ipvot = 0;

	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot % 2 == 0) glColor3f(1.0f, 1.0f, 0.0f);

		else glColor3f(0.0f, 1.0f, 1.0f);



		ipvot++;

		glVertex3f(x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(0.0f, 0.0f, 0.0f);



	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot % 2 == 0) glColor3f(0.5f, 0.0f, 0.5f);

		else glColor3f(1.0f, 0.0f, 1.0f);



		ipvot++;

		glVertex3f(x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(10.0f, 7.5f, 0.0f);



	int ipvot1 = 0;

	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot1 % 2 == 0) glColor3f(1.0f, 1.0f, 0.0f);

		else glColor3f(0.0f, 1.0f, 1.0f);



		ipvot1++;

		glVertex3f(10.0f+x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(10.0f, 0.0f, 0.0f);



	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot % 2 == 0) glColor3f(0.5f, 0.0f, 0.5f);

		else glColor3f(1.0f, 0.0f, 1.0f);



		ipvot++;

		glVertex3f(10.0f+x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(-10.0f, 7.5f, 0.0f);



	 

	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot1 % 2 == 0) glColor3f(1.0f, 1.0f, 0.0f);

		else glColor3f(0.0f, 1.0f, 1.0f);



		ipvot1++;

		glVertex3f(-10.0f + x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(-10.0f, 0.0f, 0.0f);



	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot % 2 == 0) glColor3f(0.5f, 0.0f, 0.5f);

		else glColor3f(1.0f, 0.0f, 1.0f);



		ipvot++;

		glVertex3f(-10.0f + x, 0.0f, y);

	}

	glEnd();





 



}



void DrawGrid() {

	glLineWidth(2);

	glColor3f(0.0, 0.0, 1.0);

	for (int i = -100; i <= 100; i += 10) {

		glBegin(GL_LINES);

		glVertex3f(i, 0.0f, -100.0f);

		glVertex3f(i, 0.0f, 100.f);

		glEnd();



		glBegin(GL_LINES);

		glVertex3f(-100.0f, 0.0f, i);

		glVertex3f(100.0f, 0.0f, i);

		glEnd();

	}

}



void Display() {

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	DrawGrid();

	DisplayBox();

	glutSwapBuffers();

}



void update() {

	glLoadIdentity();

	setLookAt();

	glutPostRedisplay();

}



void Reshape(int w1, int h1) {

	 

	WinWidth = w1;

	WinHeight = h1;

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	 

	glViewport(0, 0, w1, h1);

	gluPerspective(70, 1.0*w1 / h1, 1, 1000);

	//glOrtho(-30.0f, 30.0f, -30.0f, 30.0f, -60.0f, 60.0f);

	glMatrixMode(GL_MODELVIEW);

	glLoadIdentity();

}

 

void init() {

	glClearColor(0.0, 0.0, 0.0, 0.0);

	glEnable(GL_DEPTH_TEST);

	setAll(20, 1.75, 0, 0, 1.75, 0, 0, 1, 0);



}



void ProcessKeyBoard(int key, int x, int y) {

	static double delta;

	if (key == GLUT_KEY_LEFT) {

		delta += 0.03;

		setPos(20 * cos(delta), posY, 20 * sin(delta));

	}

	else if (key == GLUT_KEY_RIGHT) {

		delta -= 0.03;

		setPos(20 * cos(delta), posY, 20 * sin(delta));

	}

	else if (key == GLUT_KEY_UP) {

		delta += 0.03;

		setPos(20 * cos(delta), 40 * sin(delta), posZ);

	}

	else if (key == GLUT_KEY_DOWN) {

		delta -= 0.03;

		setPos(20 * cos(delta), 40 * sin(delta), posZ);

	}

	//setPos(20 * cos(delta), posY, 20 * sin(delta));

}



void myMouse(int button, int state, int x, int y) {

	if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) {

		 

	 



	}

	if (button == GLUT_RIGHT_BUTTON && state == GLUT_DOWN)

	{

		glOrtho(-30.0f, 30.0f, -30.0f, 30.0f, -60.0f, 60.0f);



	}

	 

	glutPostRedisplay();

}



int main(int argc, char *argv[]) {

	WinWidth = 400;

	WinHeight = 400;

	glutInit(&argc, argv);

	glutInitDisplayMode(GLUT_DEPTH | GLUT_RGB | GLUT_DOUBLE);

	glutInitWindowPosition(100, 100);

	glutInitWindowSize(WinWidth, WinHeight);

	glutCreateWindow("Rita's OpenGL");

	 

	glutReshapeFunc(&Reshape);

	//glutMouseFunc(&myMouse);

	glutIdleFunc(&update);

	glutDisplayFunc(&Display);

	glutSpecialFunc(ProcessKeyBoard);//写 char key和int key 的区别 glutKeyboardFunc &

	init();

	glutMainLoop();

	return 0;

}

opengl新手，求各位爸爸们指点指点
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weixin_41288181 2018-10-15
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啊啊啊传上去的为什么有什么<br data-filtered="filtered">，下面是没有的！！！


#include "stdafx.h"

#include <GL/glut.h>

#include <math.h>

#include <time.h>

#include <stdio.h>



int WinWidth, WinHeight;

double posX, posY, posZ, viewX, viewY, viewZ, upX, upY, upZ;

const GLfloat PI = 3.141515926;



void setAll(double px, double py, double pz,

	double vx, double vy, double vz,

	double ux, double uy, double uz)

{

	posX = px;

	posY = py;

	posZ = pz;

	viewX = vx;

	viewY = vy;

	viewZ = vz;

	upX = ux;

	upY = uy;

	upZ = uz;

}



void setLookAt() {

	gluLookAt(posX, posY, posZ,

		viewX, viewY, viewZ,

		upX, upY, upZ);

}



void setPos(double x, double y, double z) {

	posX = x;

	posY = y;

	posZ = z;

}



void DisplayBox() {

	 

	GLfloat x, y, angle;

	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(0.0f, 7.5f, 0.0f);



	int ipvot = 0;

	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot % 2 == 0) glColor3f(1.0f, 1.0f, 0.0f);

		else glColor3f(0.0f, 1.0f, 1.0f);



		ipvot++;

		glVertex3f(x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(0.0f, 0.0f, 0.0f);



	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot % 2 == 0) glColor3f(0.5f, 0.0f, 0.5f);

		else glColor3f(1.0f, 0.0f, 1.0f);



		ipvot++;

		glVertex3f(x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(10.0f, 7.5f, 0.0f);



	int ipvot1 = 0;

	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot1 % 2 == 0) glColor3f(1.0f, 1.0f, 0.0f);

		else glColor3f(0.0f, 1.0f, 1.0f);



		ipvot1++;

		glVertex3f(10.0f+x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(10.0f, 0.0f, 0.0f);



	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot % 2 == 0) glColor3f(0.5f, 0.0f, 0.5f);

		else glColor3f(1.0f, 0.0f, 1.0f);



		ipvot++;

		glVertex3f(10.0f+x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(-10.0f, 7.5f, 0.0f);



	 

	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot1 % 2 == 0) glColor3f(1.0f, 1.0f, 0.0f);

		else glColor3f(0.0f, 1.0f, 1.0f);



		ipvot1++;

		glVertex3f(-10.0f + x, 0.0f, y);

	}

	glEnd();



	glBegin(GL_TRIANGLE_FAN);

	glVertex3f(-10.0f, 0.0f, 0.0f);



	for (angle = 0.0f; angle <= (4.0f*PI); angle += (PI / 8.0f)) {

		x = 5.0f*sin(angle);

		y = 5.0f*cos(angle);



		if (ipvot % 2 == 0) glColor3f(0.5f, 0.0f, 0.5f);

		else glColor3f(1.0f, 0.0f, 1.0f);



		ipvot++;

		glVertex3f(-10.0f + x, 0.0f, y);

	}

	glEnd();





 



}



void DrawGrid() {

	glLineWidth(2);

	glColor3f(0.0, 0.0, 1.0);

	for (int i = -100; i <= 100; i += 10) {

		glBegin(GL_LINES);

		glVertex3f(i, 0.0f, -100.0f);

		glVertex3f(i, 0.0f, 100.f);

		glEnd();



		glBegin(GL_LINES);

		glVertex3f(-100.0f, 0.0f, i);

		glVertex3f(100.0f, 0.0f, i);

		glEnd();

	}

}



void Display() {

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	DrawGrid();

	DisplayBox();

	glutSwapBuffers();

}



void update() {

	glLoadIdentity();

	setLookAt();

	glutPostRedisplay();

}



void Reshape(int w1, int h1) {

	 

	WinWidth = w1;

	WinHeight = h1;

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	 

	glViewport(0, 0, w1, h1);

	gluPerspective(70, 1.0*w1 / h1, 1, 1000);

	//glOrtho(-30.0f, 30.0f, -30.0f, 30.0f, -60.0f, 60.0f);

	glMatrixMode(GL_MODELVIEW);

	glLoadIdentity();

}

 

void init() {

	glClearColor(0.0, 0.0, 0.0, 0.0);

	glEnable(GL_DEPTH_TEST);

	setAll(20, 1.75, 0, 0, 1.75, 0, 0, 1, 0);



}



void ProcessKeyBoard(int key, int x, int y) {

	static double delta;

	if (key == GLUT_KEY_LEFT) {

		delta += 0.03;

		setPos(20 * cos(delta), posY, 20 * sin(delta));

	}

	else if (key == GLUT_KEY_RIGHT) {

		delta -= 0.03;

		setPos(20 * cos(delta), posY, 20 * sin(delta));

	}

	else if (key == GLUT_KEY_UP) {

		delta += 0.03;

		setPos(20 * cos(delta), 40 * sin(delta), posZ);

	}

	else if (key == GLUT_KEY_DOWN) {

		delta -= 0.03;

		setPos(20 * cos(delta), 40 * sin(delta), posZ);

	}

	//setPos(20 * cos(delta), posY, 20 * sin(delta));

}



void myMouse(int button, int state, int x, int y) {

	if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) {

		 

	 



	}

	if (button == GLUT_RIGHT_BUTTON && state == GLUT_DOWN)

	{

		glOrtho(-30.0f, 30.0f, -30.0f, 30.0f, -60.0f, 60.0f);



	}

	 

	glutPostRedisplay();

}



int main(int argc, char *argv[]) {

	WinWidth = 400;

	WinHeight = 400;

	glutInit(&argc, argv);

	glutInitDisplayMode(GLUT_DEPTH | GLUT_RGB | GLUT_DOUBLE);

	glutInitWindowPosition(100, 100);

	glutInitWindowSize(WinWidth, WinHeight);

	glutCreateWindow("Rita's OpenGL");

	 

	glutReshapeFunc(&Reshape);

	//glutMouseFunc(&myMouse);

	glutIdleFunc(&update);

	glutDisplayFunc(&Display);

	glutSpecialFunc(ProcessKeyBoard);//写 char key和int key 的区别 glutKeyboardFunc &

	init();

	glutMainLoop();

	return 0;

}
weixin_41288181 2018-10-15
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代码能写的具体点嘛，就是加在哪里的那种，我实在想不出来啊啊啊
jiht594 2018-10-15
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mouse函数里设置bool变量，reshape里面通过变量来决定是哪个投影
赵4老师 2018-10-15
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int useP=0;//设置一个全局变量

useP=1-useP;//切换投影方式

if (useP) {//使用透视投影

 //...

} else {//使用正交投影

 //...

}
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