#include "GLWidget.h"
#include <qmath.h>
.5f
void qgluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar)
{
);
const GLdouble ymin = -ymax;
const GLdouble xmin = ymin * aspect;
const GLdouble xmax = ymax * aspect;
glFrustum(xmin, xmax, ymin, ymax, zNear, zFar);
}
GLWidget::GLWidget(QWidget *parent)
: QGLWidget(parent)
, xRot(.0f)
, yRot(.0f)
, zRot(.0f)
{
// 设置画面的双缓冲和深度缓存
setFormat(QGLFormat(QGL::DoubleBuffer | QGL::DepthBuffer));
}
GLWidget::~GLWidget()
{
}
void GLWidget::initializeGL()
{
// 启用阴影平滑
glShadeModel(GL_SMOOTH);
// 白色背景
);
// 设置深度缓存
);
// 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();
}
void GLWidget::paintGL()
{
renderScene();
update();
}
void GLWidget::resizeGL(int width, int height)
{
// 防止窗口大小变为0
)
{
height = ;
}
// 重置当前的视口
, (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
);
// 选择模型观察矩阵
glMatrixMode(GL_MODELVIEW);
// 重置投影矩阵
glLoadIdentity();
}
// 绘制立方体
void GLWidget::drawCube()
{
glBegin(GL_QUAD_STRIP); //填充凸多边形
);
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glEnd();
glBegin(GL_QUAD_STRIP);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glColor3f();
glVertex3f(.0f);
glEnd();
}
// 绘制圆形
void GLWidget::drawCircle()
{
glBegin(GL_TRIANGLE_FAN); //扇形连续填充三角形串
.0f);
;
)
{
;
glColor3f(sin(p), cos(p), tan(p));
glVertex3f(sin(p), cos(p), .0f);
}
glEnd();
}
// 绘制圆柱体
void GLWidget::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
;
)
{
;
glVertex3f(sin(p), cos(p), .0f);
glVertex3f(sin(p), cos(p), .0f);
}
glEnd();
//bottom circle
);
drawCircle();
glTranslatef();
//top circle
);
drawCircle();
glColor3f();
}
// 绘制圆锥体
void GLWidget::drawCone()
{
glBegin(GL_QUAD_STRIP);//连续填充四边形串
;
)
{
;
glColor3f(sin(p), cos(p), .0f);
glVertex3f(.0f);
glVertex3f(sin(p), cos(p), .0f);
}
glEnd();
//bottom circle
);
drawCircle();
}
// 绘制四面体等
void GLWidget::drawTetrahedron()
{
glBegin(GL_QUADS);
glNormal3f();
glColor3f();
glVertex3f(-);
glColor3f();
glVertex3f(-);
glColor3f();
glVertex3f();
glColor3f();
glVertex3f();
glEnd();
glBegin(GL_TRIANGLES);
glNormal3f();
glColor3f();
glVertex3f(-);
glColor3f();
glVertex3f();
glColor3f();
glVertex3f();
glEnd();
glBegin(GL_TRIANGLES);
glNormal3f();
glColor3f();
glVertex3f();
glColor3f();
glVertex3f();
glColor3f();
glVertex3f();
glEnd();
glBegin(GL_TRIANGLES);
glNormal3f();
glColor3f();
glVertex3f();
glColor3f();
glVertex3f(-);
glColor3f();
glVertex3f();
glEnd();
glBegin(GL_TRIANGLES);
glNormal3f(-);
glColor3f();
glVertex3f(-);
glColor3f();
glVertex3f(-);
glColor3f();
glVertex3f();
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
void GLWidget::drawSphere(GLfloat xx, GLfloat yy, GLfloat zz,
GLfloat radius, GLfloat M, GLfloat N)
{
// 选择使用的纹理
]);
float step_z = PI / M;
* PI / N;
];
;
;
;
glBegin(GL_QUADS);
; i < M; i++)
{
angle_z = i * step_z;
; j < N; j++)
{
angle_xy = j * step_xy;
x[] = radius * sin(angle_z) * cos(angle_xy);
y[] = radius * sin(angle_z) * sin(angle_xy);
z[] = radius * cos(angle_z);
x[] = radius * sin(angle_z + step_z) * cos(angle_xy);
y[] = radius * sin(angle_z + step_z) * sin(angle_xy);
z[] = radius * cos(angle_z + step_z);
x[] = radius * sin(angle_z + step_z) * cos(angle_xy + step_xy);
y[] = radius * sin(angle_z + step_z) * sin(angle_xy + step_xy);
z[] = radius * cos(angle_z + step_z);
x[] = radius * sin(angle_z) * cos(angle_xy + step_xy);
y[] = radius * sin(angle_z) * sin(angle_xy + step_xy);
z[] = radius * cos(angle_z);
; 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
void GLWidget::DrawTorus(double Radius, double TubeRadius, int Sides, int Rings)
{
* PI / Sides;
* PI / Rings;
;
;
;
double phi, sinPhi, cosPhi;
double dist;
glColor3f();
; i < Rings; i++)
{
double theta1 = theta + ringDelta;
double cosTheta1 = cos(theta1);
double sinTheta1 = sin(theta1);
glBegin(GL_QUAD_STRIP);
phi = ;
; 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
void GLWidget::loadGLTextures()
{
QImage tex1, buf1;
QImage tex2, 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("Could not read image file!");
QImage dummy(, 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("Could not read image file!");
QImage dummy(, 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
]);
// 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
]);
// 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。
,
GL_RGBA, GL_UNSIGNED_BYTE, tex1.bits());
//***********************************************//
// 纹理0：qt-logo
//***********************************************//
tex2 = QGLWidget::convertToGLFormat(buf2);
glGenTextures(]);
glBindTexture(GL_TEXTURE_2D, texture[]);
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, ,
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
void GLWidget::renderScene(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glPushMatrix();
renderBasicShape();
glPopMatrix();
glPushMatrix();
glTranslatef(-);
renderTextureCube();
glPopMatrix();
glPushMatrix();
glTranslatef();
renderTextureCylinder();
glPopMatrix();
}
// 渲染基本图形
void GLWidget::renderBasicShape()
{
.0f;
fRotAngle += ROT_DELTA;
)
fRotAngle = ;
glPushMatrix();
glColor3f();
glTranslatef(-);
glRotatef(fRotAngle, );
drawCylinder();
glPopMatrix();
glPushMatrix();
glColor3f();
glTranslatef();
glRotatef(fRotAngle, );
drawTetrahedron();
glPopMatrix();
glPushMatrix();
glColor3f();
glTranslatef();
glRotatef(fRotAngle, );
drawCircle();
glPopMatrix();
glPushMatrix();
glColor3f();
glTranslatef();
glRotatef(fRotAngle, );
drawSphere();
glPopMatrix();
glPushMatrix();
glColor3f();
glTranslatef(-);
glRotatef(fRotAngle, );
drawCube();
glPopMatrix();
glPushMatrix();
glColor3f();
glTranslatef();
glRotatef(fRotAngle, );
DrawTorus();
glPopMatrix();
glPushMatrix();
glColor3f();
glTranslatef();
glRotatef(fRotAngle, );
drawCone();
glPopMatrix();
}
// 渲染纹理
void GLWidget::renderTextureCube()
{
// 纹理映射
);
glTranslatef(.0f);
glRotatef(xRot, );
glRotatef(yRot, );
glRotatef(zRot, );
// 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
]);
glBegin( GL_QUADS );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( - );
glTexCoord2f( );
glVertex3f( - );
glEnd();
xRot += ROT_DELTA;
;
yRot += ROT_DELTA;
;
zRot += ROT_DELTA;
;
}
void GLWidget::renderTextureCylinder()
{
// 纹理映射
.0f);
glRotatef(xRot, );
//glRotatef(yRot, 0.0, 1.0, 0.0);
//glRotatef(zRot, 0.0, 0.0, 1.0);
// 选择使用的纹理
]);
// 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
;
)
{
;
//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
.1f);
glVertex3f(sin(p), cos(p), .0f); //这个 1.0f指定的是高度h
.0f);
glVertex3f(sin(p), cos(p), .0f);
}
glEnd();
//bottom circle
glBegin(GL_TRIANGLE_FAN); //扇形连续填充三角形串
.0f); //将纹理图(0, 0)映射到圆心
.0f);
)
{
;
glTexCoord2f(.0f); //将纹理图(1, 0)映射到圆周
.0f);
}
glEnd();
glTranslatef(); //设定高度为1，画上底面
//top circle
glBegin(GL_TRIANGLE_FAN); //扇形连续填充三角形串
.0f); //将纹理图(0, 0)映射到圆心
.0f);
)
{
;
glTexCoord2f(.0f); //将纹理图(1, 0)映射到圆周
.0f);
}
glEnd();
xRot += ROT_DELTA;
;
yRot += ROT_DELTA;
;
zRot += ROT_DELTA;
;
}