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#include"GLWidget.h"
#include<qmath.h>

#definePI3.14
#defineROT_DELTA0.5f

voidqgluPerspective(GLdoublefovy,GLdoubleaspect,GLdoublezNear,GLdoublezFar)
{
constGLdoubleymax=zNear*tan(qDegreesToRadians(fovy)/2.0);
constGLdoubleymin=-ymax;
constGLdoublexmin=ymin*aspect;
constGLdoublexmax=ymax*aspect;
glFrustum(xmin,xmax,ymin,ymax,zNear,zFar);
}

GLWidget::GLWidget(QWidget*parent)
:QGLWidget(parent)
,xRot(0.0f)
,yRot(0.0f)
,zRot(0.0f)
{
//设置画面的双缓冲和深度缓存
setFormat(QGLFormat(QGL::DoubleBuffer|QGL::DepthBuffer));
}

GLWidget::~GLWidget()
{

}

voidGLWidget::initializeGL()
{
//启用阴影平滑
glShadeModel(GL_SMOOTH);
//白色背景
glClearColor(1.0,1.0,1.0,1.0);
//设置深度缓存
glClearDepth(1.0);
//启用深度测试
glEnable(GL_DEPTH_TEST);
//所作深度测试的类型
glDepthFunc(GL_LEQUAL);
//告诉系统对透视进行修正
glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
//启用2D纹理映射
glEnable(GL_TEXTURE_2D);
//加载纹理
loadGLTextures();
}

voidGLWidget::paintGL()
{
renderScene();
update();
}

voidGLWidget::resizeGL(intwidth,intheight)
{
//防止窗口大小变为0
if(height==0)
{
height=1;
}
//重置当前的视口
glViewport(0,0,(GLint)width,(GLint)height);
//选择投影矩阵
glMatrixMode(GL_PROJECTION);
//重置投影矩阵
glLoadIdentity();
//设置视口的大小
qgluPerspective(45.0,(GLdouble)width/(GLdouble)height,0.1,100.0);
//选择模型观察矩阵
glMatrixMode(GL_MODELVIEW);
//重置投影矩阵
glLoadIdentity();
}

//绘制立方体
voidGLWidget::drawCube()
{
glBegin(GL_QUAD_STRIP);//填充凸多边形
glColor3f(1,0,0);
glVertex3f(0.0f,0.0f,0.0f);
glColor3f(1,1,0);
glVertex3f(0.0f,1.0f,0.0f);
glColor3f(0,1,0);
glVertex3f(1.0f,0.0f,0.0f);
glColor3f(0,1,1);
glVertex3f(1.0f,1.0f,0.0f);
glColor3f(1,0,0);
glVertex3f(1.0f,0.0f,-1.0f);
glColor3f(1,1,0);
glVertex3f(1.0f,1.0f,-1.0f);
glColor3f(0,1,0);
glVertex3f(0.0f,0.0f,-1.0f);
glColor3f(0,1,1);
glVertex3f(0.0f,1.0f,-1.0f);
glColor3f(1,0,0);
glVertex3f(0.0f,0.0f,0.0f);
glColor3f(1,1,0);
glVertex3f(0.0f,1.0f,0.0f);
glEnd();
glBegin(GL_QUAD_STRIP);
glColor3f(0,0,1);
glVertex3f(0.0f,0.0f,0.0f);
glColor3f(1,0,1);
glVertex3f(1.0f,0.0f,0.0f);
glColor3f(0,1,0);
glVertex3f(0.0f,0.0f,-1.0f);
glColor3f(1,0,0);
glVertex3f(1.0f,0.0f,-1.0f);
glColor3f(1,1,0);
glVertex3f(0.0f,1.0f,0.0f);
glColor3f(1,0,1);
glVertex3f(1.0f,1.0f,0.0f);
glColor3f(0,0,1);
glVertex3f(0.0f,1.0f,-1.0f);
glColor3f(1,0,0);
glVertex3f(1.0f,1.0f,-1.0f);
glEnd();
}

//绘制圆形
voidGLWidget::drawCircle()
{
glBegin(GL_TRIANGLE_FAN);//扇形连续填充三角形串
glVertex3f(0.0f,0.0f,0.0f);
inti=0;
for(i=0;i<=360;i+=15)
{
floatp=i*3.14/180;
glColor3f(sin(p),cos(p),tan(p));
glVertex3f(sin(p),cos(p),0.0f);
}
glEnd();
}

//绘制圆柱体
voidGLWidget::drawCylinder()
{
//利用三角形和四边形等基本图元绘制底面圆圆心在坐标原点，半径为r，高为h，方向沿z轴方向的圆柱；
//侧面用多个四边形,底面用多个三角形来表示
glBegin(GL_QUAD_STRIP);//连续填充四边形串
inti=0;
for(i=0;i<=360;i+=15)
{
floatp=i*3.14/180;
glVertex3f(sin(p),cos(p),1.0f);
glVertex3f(sin(p),cos(p),0.0f);
}
glEnd();
//bottomcircle
glColor3f(1,0,0);
drawCircle();
glTranslatef(0,0,1);
//topcircle
glColor3f(0,0,1);
drawCircle();
glColor3f(0,1,0);
}

//绘制圆锥体
voidGLWidget::drawCone()
{
glBegin(GL_QUAD_STRIP);//连续填充四边形串
inti=0;
for(i=0;i<=360;i+=15)
{
floatp=i*3.14/180;
glColor3f(sin(p),cos(p),1.0f);
glVertex3f(0,0,1.0f);
glVertex3f(sin(p),cos(p),0.0f);
}
glEnd();
//bottomcircle
glColor3f(0,1,1);
drawCircle();
}

//绘制四面体等
voidGLWidget::drawTetrahedron()
{
glBegin(GL_QUADS);
glNormal3f(0,0,-1);
glColor3f(1.0,0.0,0.0);
glVertex3f(-1,-1,0);
glColor3f(0.0,1.0,0.0);
glVertex3f(-1,1,0);
glColor3f(0.0,0.0,1.0);
glVertex3f(1,1,0);
glColor3f(1.0,1.0,0.0);
glVertex3f(1,-1,0);
glEnd();

glBegin(GL_TRIANGLES);
glNormal3f(0,-1,0.707);
glColor3f(0.0,1.0,1.0);
glVertex3f(-1,-1,0);
glColor3f(1.0,0.0,1.0);
glVertex3f(1,-1,0);
glColor3f(1.0,0.0,1.0);
glVertex3f(0,0,1.2);
glEnd();
glBegin(GL_TRIANGLES);
glNormal3f(1,0,0.707);
glColor3f(0.0,1.0,1.0);
glVertex3f(1,-1,0);
glColor3f(1.0,0.0,1.0);
glVertex3f(1,1,0);
glColor3f(1.0,0.0,1.0);
glVertex3f(0,0,1.2);
glEnd();
glBegin(GL_TRIANGLES);
glNormal3f(0,1,0.707);
glColor3f(0.0,1.0,1.0);
glVertex3f(1,1,0);
glColor3f(1.0,0.0,1.0);
glVertex3f(-1,1,0);
glColor3f(1.0,0.0,1.0);
glVertex3f(0,0,1.2);
glEnd();
glBegin(GL_TRIANGLES);
glNormal3f(-1,0,0.707);
glColor3f(1.0,0.0,1.0);
glVertex3f(-1,1,0);
glColor3f(0.0,1.0,1.0);
glVertex3f(-1,-1,0);
glColor3f(1.0,0.0,0.0);
glVertex3f(0,0,1.2);
glEnd();
}

//绘制球体
//球心坐标为（x，y，z），球的半径为radius，M，N分别表示球体的横纵向被分成多少份
voidGLWidget::drawSphere(GLfloatxx,GLfloatyy,GLfloatzz,
GLfloatradius,GLfloatM,GLfloatN)
{
//选择使用的纹理
glBindTexture(GL_TEXTURE_2D,texture[0]);

floatstep_z=PI/M;
floatstep_xy=2*PI/N;
floatx[4],y[4],z[4];

floatangle_z=0.0;
floatangle_xy=0.0;
inti=0,j=0;
glBegin(GL_QUADS);
for(i=0;i<M;i++)
{
angle_z=i*step_z;

for(j=0;j<N;j++)
{
angle_xy=j*step_xy;

x[0]=radius*sin(angle_z)*cos(angle_xy);
y[0]=radius*sin(angle_z)*sin(angle_xy);
z[0]=radius*cos(angle_z);

x[1]=radius*sin(angle_z+step_z)*cos(angle_xy);
y[1]=radius*sin(angle_z+step_z)*sin(angle_xy);
z[1]=radius*cos(angle_z+step_z);

x[2]=radius*sin(angle_z+step_z)*cos(angle_xy+step_xy);
y[2]=radius*sin(angle_z+step_z)*sin(angle_xy+step_xy);
z[2]=radius*cos(angle_z+step_z);

x[3]=radius*sin(angle_z)*cos(angle_xy+step_xy);
y[3]=radius*sin(angle_z)*sin(angle_xy+step_xy);
z[3]=radius*cos(angle_z);
for(intk=0;k<4;k++)
{
glColor3f(sin(angle_z),cos(angle_z),tan(angle_z));
//glTexCoord2f(0.1f,0.1f);
glVertex3f(xx+x[k],yy+y[k],zz+z[k]);
}
}
}
glEnd();
}

//绘制圆环
//大半径Radius，小半径TubeRadius，边数Sides，环数Rings
voidGLWidget::DrawTorus(doubleRadius,doubleTubeRadius,intSides,intRings)
{
doublesideDelta=2.0*PI/Sides;
doubleringDelta=2.0*PI/Rings;
doubletheta=0;
doublecosTheta=1.0;
doublesinTheta=0.0;

doublephi,sinPhi,cosPhi;
doubledist;
glColor3f(1,0,0);
for(inti=0;i<Rings;i++)
{
doubletheta1=theta+ringDelta;
doublecosTheta1=cos(theta1);
doublesinTheta1=sin(theta1);

glBegin(GL_QUAD_STRIP);
phi=0;
for(intj=0;j<=Sides;j++)
{
phi=phi+sideDelta;
cosPhi=cos(phi);
sinPhi=sin(phi);
dist=Radius+(TubeRadius*cosPhi);

glNormal3f(cosTheta*cosPhi,sinTheta*cosPhi,sinPhi);
glColor3f(cosTheta,sinTheta,sinPhi);
glVertex3f(cosTheta*dist,sinTheta*dist,TubeRadius*sinPhi);

glNormal3f(cosTheta1*cosPhi,sinTheta1*cosPhi,sinPhi);
glColor3f(cosTheta1,sinTheta1,sinPhi);
glVertex3f(cosTheta1*dist,sinTheta1*dist,TubeRadius*sinPhi);
}
glEnd();
theta=theta1;
cosTheta=cosTheta1;
sinTheta=sinTheta1;
}
}

//加载纹理
voidGLWidget::loadGLTextures()
{
QImagetex1,buf1;
QImagetex2,buf2;
if(!buf1.load(":/data/qt-logo.jpg"))
{
//如果载入不成功，自动生成一个128*128的32位色的绿色图片。
qWarning("Couldnotreadimagefile!");
QImagedummy(128,128,QImage::Format_RGB32);
dummy.fill(Qt::green);
buf1=dummy;
}

if(!buf2.load(":/data/qt-wood.jpg"))
{
//如果载入不成功，自动生成一个128*128的32位色的绿色图片。
qWarning("Couldnotreadimagefile!");
QImagedummy(128,128,QImage::Format_RGB32);
dummy.fill(Qt::green);
buf2=dummy;
}

//***********************************************//
//纹理0：qt-logo
//***********************************************//
//转换成纹理类型
tex1=QGLWidget::convertToGLFormat(buf1);
//创建纹理
glGenTextures(1,&texture[0]);
//使用来自位图数据生成的典型纹理,将纹理名字texture[0]绑定到纹理目标上
glBindTexture(GL_TEXTURE_2D,texture[0]);
//WRAP参数：纹理坐标超出[0,0]到[1,1]的范围该怎么处理呢？
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
//Filter参数：纹理坐标映射到纹素位置(127.34,255.14)该怎么办?
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
//纹理环境
glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_REPLACE);
//将纹素数组从CPU传至GPU并且设置为当前纹理。
//在处理单一纹理时，你可以用，负责效率非常低。
//多纹理时可以参见纹理绑定。
glTexImage2D(GL_TEXTURE_2D,0,3,tex1.width(),tex1.height(),0,
GL_RGBA,GL_UNSIGNED_BYTE,tex1.bits());

//***********************************************//
//纹理0：qt-logo
//***********************************************//
tex2=QGLWidget::convertToGLFormat(buf2);
glGenTextures(1,&texture[1]);
glBindTexture(GL_TEXTURE_2D,texture[1]);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glTexImage2D(GL_TEXTURE_2D,0,3,tex2.width(),tex2.height(),0,
GL_RGBA,GL_UNSIGNED_BYTE,tex2.bits());
//使用纹理
//首先调用glEnable(GL_TEXTURE_2D)，来启用2D纹理;
//然后绘制图形，并且为每个顶点指定ST坐标;
//最后调用glDisable(GL_TEXTURE_2D).
}

//场景渲染
voidGLWidget::renderScene(void)
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();

glPushMatrix();
renderBasicShape();
glPopMatrix();

glPushMatrix();
glTranslatef(-3,0,0);
renderTextureCube();
glPopMatrix();

glPushMatrix();
glTranslatef(3,0,0);
renderTextureCylinder();
glPopMatrix();
}

//渲染基本图形
voidGLWidget::renderBasicShape()
{
staticfloatfRotAngle=0.0f;
fRotAngle+=ROT_DELTA;
if(fRotAngle>360)
fRotAngle=0;

glPushMatrix();
glColor3f(0,1,0);
glTranslatef(-3,3,-12);
glRotatef(fRotAngle,1,1,1);
drawCylinder();
glPopMatrix();

glPushMatrix();
glColor3f(1,0,0);
glTranslatef(0,3,-12);
glRotatef(fRotAngle,1,1,1);
drawTetrahedron();
glPopMatrix();

glPushMatrix();
glColor3f(1,0,0);
glTranslatef(3,3,-12);
glRotatef(fRotAngle,1,1,1);
drawCircle();
glPopMatrix();

glPushMatrix();
glColor3f(1,0,0);
glTranslatef(0,0,-15);
glRotatef(fRotAngle,0,1,0);
drawSphere();
glPopMatrix();

glPushMatrix();
glColor3f(0,1,1);
glTranslatef(-3,-3,-12);
glRotatef(fRotAngle,1,1,1);
drawCube();
glPopMatrix();

glPushMatrix();
glColor3f(1,0,1);
glTranslatef(0,-3,-12);
glRotatef(fRotAngle,1,1,1);
DrawTorus();
glPopMatrix();

glPushMatrix();
glColor3f(1,1,0);
glTranslatef(3,-3,-12);
glRotatef(fRotAngle,1,1,1);
drawCone();
glPopMatrix();
}

//渲染纹理
voidGLWidget::renderTextureCube()
{
//纹理映射
glColor3f(1.0,1.0,1.0);
glTranslatef(0.0f,0.0f,-12.0f);
glRotatef(xRot,1.0,0.0,0.0);
glRotatef(yRot,0.0,1.0,0.0);
glRotatef(zRot,0.0,0.0,1.0);
//使用来自位图数据生成的典型纹理,将纹理名字texture[0]绑定到纹理目标上
glBindTexture(GL_TEXTURE_2D,texture[0]);
glBegin(GL_QUADS);
glTexCoord2f(0.0,0.0);
glVertex3f(-1.0,-1.0,1.0);
glTexCoord2f(1.0,0.0);
glVertex3f(1.0,-1.0,1.0);
glTexCoord2f(1.0,1.0);
glVertex3f(1.0,1.0,1.0);
glTexCoord2f(0.0,1.0);
glVertex3f(-1.0,1.0,1.0);
glTexCoord2f(1.0,0.0);
glVertex3f(-1.0,-1.0,-1.0);
glTexCoord2f(1.0,1.0);
glVertex3f(-1.0,1.0,-1.0);
glTexCoord2f(0.0,1.0);
glVertex3f(1.0,1.0,-1.0);
glTexCoord2f(0.0,0.0);
glVertex3f(1.0,-1.0,-1.0);
glTexCoord2f(0.0,1.0);
glVertex3f(-1.0,1.0,-1.0);
glTexCoord2f(0.0,0.0);
glVertex3f(-1.0,1.0,1.0);
glTexCoord2f(1.0,0.0);
glVertex3f(1.0,1.0,1.0);
glTexCoord2f(1.0,1.0);
glVertex3f(1.0,1.0,-1.0);
glTexCoord2f(1.0,1.0);
glVertex3f(-1.0,-1.0,-1.0);
glTexCoord2f(0.0,1.0);
glVertex3f(1.0,-1.0,-1.0);
glTexCoord2f(0.0,0.0);
glVertex3f(1.0,-1.0,1.0);
glTexCoord2f(1.0,0.0);
glVertex3f(-1.0,-1.0,1.0);
glTexCoord2f(1.0,0.0);
glVertex3f(1.0,-1.0,-1.0);
glTexCoord2f(1.0,1.0);
glVertex3f(1.0,1.0,-1.0);
glTexCoord2f(0.0,1.0);
glVertex3f(1.0,1.0,1.0);
glTexCoord2f(0.0,0.0);
glVertex3f(1.0,-1.0,1.0);
glTexCoord2f(0.0,0.0);
glVertex3f(-1.0,-1.0,-1.0);
glTexCoord2f(1.0,0.0);
glVertex3f(-1.0,-1.0,1.0);
glTexCoord2f(1.0,1.0);
glVertex3f(-1.0,1.0,1.0);
glTexCoord2f(0.0,1.0);
glVertex3f(-1.0,1.0,-1.0);
glEnd();
xRot+=ROT_DELTA;
if(xRot>360)xRot=0;
yRot+=ROT_DELTA;
if(yRot>360)yRot=0;
zRot+=ROT_DELTA;
if(zRot>360)zRot=0;
}

voidGLWidget::renderTextureCylinder()
{
//纹理映射
glTranslatef(0.0f,0.0f,-12.0f);
glRotatef(xRot,1.0,0.0,0.0);
//glRotatef(yRot,0.0,1.0,0.0);
//glRotatef(zRot,0.0,0.0,1.0);
//选择使用的纹理
glBindTexture(GL_TEXTURE_2D,texture[1]);
//利用三角形和四边形等基本图元绘制底面圆圆心在坐标原点，半径为r，高为h，方向沿z轴方向的圆柱；
//侧面用多个四边形,底面用多个三角形来表示
glBegin(GL_QUAD_STRIP);//连续填充四边形串
inti=0;
for(i=0;i<=360;i+=15)
{
floatp=i*3.14/180;
//p和圆周是相对应的，这里让纹理的横坐标随圆周扫过的角度一起改变，就能够将纹理图“刷”上去了，
//而纵坐标设置为图像的高度和纹理高度的对应，这里合适的参数是根据实际测试得到的
glTexCoord2f(p/10,0.1f);
glVertex3f(sin(p),cos(p),1.0f);//这个1.0f指定的是高度h
glTexCoord2f(p/10,0.0f);
glVertex3f(sin(p),cos(p),0.0f);
}
glEnd();
//bottomcircle
glBegin(GL_TRIANGLE_FAN);//扇形连续填充三角形串
glTexCoord2f(0.0f,0.0f);//将纹理图(0,0)映射到圆心
glVertex3f(0.0f,0.0f,0.0f);
for(i=0;i<=360;i+=15)
{
floatp=i*3.14/180;
glTexCoord2f(1.0f,0.0f);//将纹理图(1,0)映射到圆周
glVertex3f(sin(p),cos(p),0.0f);
}
glEnd();
glTranslatef(0,0,1);//设定高度为1，画上底面
//topcircle
glBegin(GL_TRIANGLE_FAN);//扇形连续填充三角形串
glTexCoord2f(0.0f,0.0f);//将纹理图(0,0)映射到圆心
glVertex3f(0.0f,0.0f,0.0f);
for(i=0;i<=360;i+=15)
{
floatp=i*3.14/180;
glTexCoord2f(1.0f,0.0f);//将纹理图(1,0)映射到圆周
glVertex3f(sin(p),cos(p),0.0f);
}
glEnd();

xRot+=ROT_DELTA;
if(xRot>360)xRot=0;
yRot+=ROT_DELTA;
if(yRot>360)yRot=0;
zRot+=ROT_DELTA;
if(zRot>360)zRot=0;
}