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klglutil.cpp
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klglutil.cpp
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#include "klglutil.h"
KLGLUtil::KLGLUtil()
{
}
//adopted here: http://www.cburch.com/cs/490/sched/feb8/index.html
void KLGLUtil::drawSphere(double radius, int lats, int longs)
{
// int i, j;
// for(i = 0; i <= lats; i++) {
// double lat0 = M_PI * (-0.5 + (double) (i - 1) / lats);
// double z0 = sin(lat0);
// double zr0 = cos(lat0);
// double lat1 = M_PI * (-0.5 + (double) i / lats);
// double z1 = sin(lat1);
// double zr1 = cos(lat1);
// glBegin(GL_QUAD_STRIP);
// for(j = 0; j <= longs; j++) {
// double lng = 2 * M_PI * (double) (j - 1) / longs;
// double x = cos(lng);
// double y = sin(lng);
// glNormal3f(radius * x * zr0, radius * y * zr0, radius * z0);
// glVertex3f(radius * x * zr0, radius * y * zr0, radius * z0);
// glNormal3f(radius * x * zr1, radius * y * zr1, radius * z1);
// glVertex3f(radius * x * zr1, radius * y * zr1, radius * z1);
// }
// glEnd();
// }
GLUquadricObj* quadratic;
quadratic = gluNewQuadric();
gluQuadricNormals(quadratic, GLU_SMOOTH);
gluQuadricTexture(quadratic, GL_TRUE);
gluSphere(quadratic, radius, lats, longs);
}
void KLGLUtil::drawAxis(double size)
{
//x red
glColor3f(1.0,0,0);
glBegin(GL_LINES);
glVertex3f(0,0,0);
glVertex3f(size,0,0);
glEnd();
glPushMatrix();
glTranslatef(size,0,0);
glRotatef(90,0,0,-1);
drawCylinder(size/15, size/128, size/5,16,2);
glPopMatrix();
//y green
glColor3f(0,1.0,0);
glBegin(GL_LINES);
glVertex3f(0,0,0);
glVertex3f(0,size,0);
glEnd();
glPushMatrix();
glTranslatef(0,size,0);
drawCylinder(size/15, size/128, size/5,16,2);
//glutSolidCone(size/12, size/4, 16,16);
glPopMatrix();
//z blue
glColor3f(0,0,1.0);
glBegin(GL_LINES);
glVertex3f(0,0,0);
glVertex3f(0,0,size);
glEnd();
glPushMatrix();
glTranslatef(0,0,size);
glRotatef(90, 1, 0, 0);
drawCylinder(size/15, size/128, size/5,16,2);
glPopMatrix();
//
glColor3f(1.0,1.0,1.0);
}
void KLGLUtil::drawCube(double size)
{
static const GLfloat vertex_list[][3] = {
-0.5f, -0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
-0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
};
static const GLint index_list[][4] = {
0, 2, 3, 1,
0, 4, 6, 2,
0, 1, 5, 4,
4, 5, 7, 6,
1, 3, 7, 5,
2, 6, 7, 3,
};
glBegin(GL_QUADS);
for (int i=0; i<6; ++i)
for (int j=0; j<4; ++j){
glVertex3f(
vertex_list[index_list[i][j]][0] * size,
vertex_list[index_list[i][j]][1] * size,
vertex_list[index_list[i][j]][2] * size
);
}
glEnd();
}
void KLGLUtil::drawBox(double length, double width, double height)
{
glPushMatrix();
glScalef(length, height, width);
KLGLUtil::drawCube(1.0);
glPopMatrix();
}
void KLGLUtil::drawWiredPlane(double length, double width, int divideL, int divideW)
{
glBegin(GL_LINE_LOOP);
glVertex3f(-length / 2, 0, -width / 2);
glVertex3f(length / 2, 0, -width / 2);
glVertex3f(length / 2, 0, width / 2);
glVertex3f(-length / 2, 0, width / 2);
glEnd();
glBegin(GL_LINES);
for(int i = 1; i < divideL; i++){
glVertex3f(-length / 2 + i * length / divideL, 0, -width / 2);
glVertex3f(-length / 2 + i * length / divideL, 0, width / 2);
}
glEnd();
glBegin(GL_LINES);
for(int i = 1; i < divideW; i++){
glVertex3f(-length / 2, 0, -width / 2 + i * width / divideW);
glVertex3f(length / 2, 0, -width / 2 + i * width / divideW);
}
glEnd();
}
void KLGLUtil::drawCylinder(double baseRadius, double topRadius, double height, int divideR, int divideH)
{
GLUquadricObj *quadratic;
quadratic=gluNewQuadric();
gluQuadricNormals(quadratic, GLU_SMOOTH);
gluQuadricTexture(quadratic, GL_TRUE);
glPushMatrix();
glRotatef(-90, 1, 0, 0);
gluCylinder(quadratic,baseRadius,topRadius,height,divideR,divideH);
int STEP = divideR;
GLfloat rbase=baseRadius;
GLfloat rtop=topRadius;
glBegin(GL_POLYGON);
GLfloat n1[]={0.0,0.0,-1.0};
glNormal3fv(n1);
for(int i=0;i<=STEP+10;i++){
glVertex3f(sin(360/STEP*i*M_PI/180)*rbase,cos(360/STEP*i*M_PI/180)*rbase,0.0);
}
glEnd();
glBegin(GL_POLYGON);
GLfloat n2[]={0.0,0.0,1.0};
glNormal3fv(n2);
for(int i=0;i<=STEP+10;i++){
glVertex3f(sin(360/STEP*i*M_PI/180)*rtop,cos(360/STEP*i*M_PI/180)*rtop,height);
}
glEnd();
glPopMatrix();
}
//adopted here: http://www.cnblogs.com/xpvincent/archive/2013/02/16/2913537.html
void KLGLUtil::drawHeavySpring(QVector3D ptStart, QVector3D ptEnd, double Radius, double TubeRadius, double Coils, int Rings, int Sides)
{
double sideDelta = 2.0 * M_PI / Sides;
double ringDelta = 2.0 * M_PI / Rings;
double ringHeight;
double theta = 0;
double cosTheta = 1.0;
double sinTheta = 0.0;
double z;
double phi, sinPhi, cosPhi;
double dist;
double springLength;
QVector3D ptOldFrame, ptNewFrame;
QVector3D rotationAxis;
QMatrix4x4 rotationMatrix;
double rotationAngle;
ptOldFrame = QVector3D(0, 0, 1);
ptNewFrame = ptEnd - ptStart;
springLength = qSqrt(ptNewFrame.x() * ptNewFrame.x()
+ ptNewFrame.y() * ptNewFrame.y()
+ ptNewFrame.z() * ptNewFrame.z());
ringHeight = springLength / Coils / Rings;
QVector3D crossOldNew = QVector3D::crossProduct(ptOldFrame, ptNewFrame);
rotationAngle = qAsin((crossOldNew.length() / (ptOldFrame.length() * ptNewFrame.length())));
rotationAxis = crossOldNew;
rotationMatrix.rotate(rotationAngle * 180 / M_PI, rotationAxis);
glPushMatrix();
glTranslatef(ptStart.x(), ptStart.y(), ptStart.z());
float *temp = rotationMatrix.data();
GLdouble m[16];
for(int i = 0; i < 16; i++){
m[i] = temp[i];
}
glMultMatrixd(m);
z = 0;
for (int i = 0; i < Coils; i++)
{
for (int j = 0; j < Rings; j++)
{
double theta1 = theta + ringDelta;
double cosTheta1 = qCos(theta1);
double sinTheta1 = qSin(theta1);
glBegin(GL_QUAD_STRIP);
phi = 0;
for (int k = 0; k <= Sides; k++)
{
phi = phi + sideDelta;
cosPhi = qCos(phi);
sinPhi = qSin(phi);
dist = Radius + (TubeRadius * cosPhi);
GLfloat n1[]={cosTheta * (dist - Radius), sinTheta * (dist - Radius), TubeRadius * sinPhi};
glNormal3fv(n1);
glVertex3d(cosTheta * dist, sinTheta * dist, z + TubeRadius * sinPhi);
GLfloat n2[]={cosTheta1 * (dist - Radius), sinTheta1 * (dist - Radius), TubeRadius * sinPhi};
glNormal3fv(n2);
glVertex3d(cosTheta1 * dist, sinTheta1 * dist, z +ringHeight+ TubeRadius * sinPhi);
}
glEnd();
theta = theta1;
cosTheta = cosTheta1;
sinTheta = sinTheta1;
z += ringHeight;
}
}
glPopMatrix();
}
void KLGLUtil::drawCircle(double radius, int slices)
{
glBegin(GL_LINE_LOOP);
for(int i = 0; i < slices; i++){
glVertex3d(radius * qCos((360.0 / slices) * i / 180 * M_PI), radius * qSin((360.0 / slices) * i / 180 * M_PI), 0);
}
glEnd();
}
void KLGLUtil::drawParabola(double a, double b, double c, double startX, double endX, int slices)
{
glBegin(GL_LINE_STRIP);
for(int i = 0; i < slices; i++){
double x = startX + i * (endX - startX) / slices;
glVertex3d(x, a*x*x + b * x + c, 0);
}
glEnd();
}