geometry* createSphere(int divisions)
{
geometry* geom = new geometry();
glm::vec3 v[4] =
{
glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec3(0.0f, 0.942806, -0.333333),
glm::vec3(-0.816497, -0.471405, -0.333333),
glm::vec3(0.816497, -0.471405, -0.333333)
};
glm::vec2 t[4] =
{
glm::vec2(v[0].x, v[0].y),
glm::vec2(v[1].x, v[1].y),
glm::vec2(v[2].x, v[2].y),
glm::vec2(v[3].x, v[3].y)
};
divideTriangle(geom, v[0], v[1], v[2], divisions);
divideTriangle(geom, v[3], v[2], v[1], divisions);
divideTriangle(geom, v[0], v[3], v[1], divisions);
divideTriangle(geom, v[0], v[2], v[3], divisions);
createVertexBuffer(geom);
createNormalBuffer(geom);
createTexBuffer(geom);
glBindVertexArray(0);
return geom;
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// HW3a::divideTriangle:
//
// Recursive subdivision of triangle (a,b,c). Recurse count times.
//
void
HW3a::divideTriangle(vec2 a, vec2 b, vec2 c, int count)
{
if (count>0) {
float midab1 = (a.x() + b.x()) / 2.0;
float midab2 = (a.y() + b.y()) / 2.0;
float midac1 = (a.x() + c.x()) / 2.0;
float midac2 = (a.y() + c.y()) / 2.0;
float midbc1 = (b.x() + c.x()) / 2.0;
float midbc2 = (b.y() + c.y()) / 2.0;
vec2 tema;
tema.setX(midab1);
tema.setY(midab2);
vec2 temb;
temb.setX(midac1);
temb.setY(midac2);
vec2 temc;
temc.setX(midbc1);
temc.setY(midbc2);
divideTriangle(a, tema, temb, count - 1);
divideTriangle(c, temb, temc, count - 1);
divideTriangle(b, temc, tema, count - 1);
divideTriangle(tema, temb, temc, count-1);
}
else triangle(a, b, c);
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// HW1b::setSubdivide:
//
// Slot function to set subdivisions.
//
void
HW1b::setSubdivide(int divisions)
{
// update slider and spinbox
m_subdivideSlider-> blockSignals(true);
m_subdivideSlider-> setValue(divisions);
m_subdivideSlider-> blockSignals(false);
m_subdivideSpinBox-> blockSignals(true);
m_subdivideSpinBox-> setValue(divisions);
m_subdivideSpinBox-> blockSignals(false);
// populate m_points
m_points.clear();
divideTriangle(m_init_points[0], m_init_points[1], m_init_points[2], m_subdivideSlider->value());
// populate m_colors
m_colors.clear();
for (int i = 0; i < m_points.size() / 3; i++)
{
// Create a random color
float rand_color_val_R = (std::rand() % 255 + 1)/255.0;
float rand_color_val_G = (std::rand() % 255 + 1)/255.0;
float rand_color_val_B = (std::rand() % 255 + 1)/255.0;
m_colors.push_back(QVector3D(rand_color_val_R, rand_color_val_G, rand_color_val_B));
}
// redraw
updateGL();
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// HW1b::divideTriangle:
//
// Divide triangle recursively.
//
void
HW1b::divideTriangle(QVector2D a, QVector2D b, QVector2D c, int count)
{
if (count > 0)
{
QVector2D ab = QVector2D( (a.x() + b.x() ) /2, (a.y() + b.y() ) /2);
QVector2D ac = QVector2D( (a.x() + c.x() ) /2,( a.y() + c.y() ) /2);
QVector2D bc = QVector2D( (b.x() + c.x() ) /2,( b.y() + c.y() ) /2);
divideTriangle(a, ab, ac, count-1);
divideTriangle(b, bc, ab, count-1);
divideTriangle(c, ac, bc, count-1);
divideTriangle(ab, ac, bc, count-1);
}
else
{
triangle(a, b, c);
}
}
void divideTriangle(geometry* geom, const glm::vec3& a, glm::vec3& b, glm::vec3& c, int divisions)
{
if(divisions > 0)
{
glm::vec3 ab, ac, bc;
ab = glm::normalize(glm::vec3(a + b) / glm::vec3(2.0f, 2.0f, 2.0f));
ac = glm::normalize(glm::vec3(a + c) / glm::vec3(2.0f, 2.0f, 2.0f));
bc = glm::normalize(glm::vec3(b + c) / glm::vec3(2.0f, 2.0f, 2.0f));
divideTriangle(geom, a, ab, ac, divisions - 1);
divideTriangle(geom, ab, b, bc, divisions - 1);
divideTriangle(geom, ac, bc, c, divisions - 1);
divideTriangle(geom, ab, ac, bc, divisions - 1);
}
else triangle(geom, a, b, c);
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// HW1b::setYesTwist
//
// Slot function to toggle yesTwist radioButton
//
void
HW1b::setYesTwist()
{
m_twist = true;
// populate m_points
m_points.clear();
divideTriangle(m_init_points[0], m_init_points[1], m_init_points[2], m_subdivideSlider->value());
// redraw
updateGL();
}
void divideTriangle(geometry* geom, const glm::vec3& a, glm::vec3& b, glm::vec3& c, int divisions)
{
if(divisions > 0)
{
glm::vec3 ab, ac, bc, abx, acx, bcx;
glm::vec3 tempA, tempB, tempC;
glm::vec3 radius = glm::vec3(1.0f, 1.0f, 1.0f);
ab = glm::normalize(glm::vec3(a + b) / glm::vec3(2.0f, 2.0f, 2.0f));
ac = glm::normalize(glm::vec3(a + c) / glm::vec3(2.0f, 2.0f, 2.0f));
bc = glm::normalize(glm::vec3(b + c) / glm::vec3(2.0f, 2.0f, 2.0f));
divideTriangle(geom, a, ab, ac, divisions - 1);
divideTriangle(geom, ab, b, bc, divisions - 1);
divideTriangle(geom, ac, bc, c, divisions - 1);
divideTriangle(geom, ab, ac, bc, divisions - 1);
}
else triangle(geom, a, b, c);
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// HW3a::initVertexBuffer:
//
// Initialize vertex buffer.
//
void
HW3a::initVertexBuffer()
{
// init geometry data
const vec2 vertices[] = {
vec2( 0.0f, 0.75f ),
vec2( 0.65f, -0.375f),
vec2(-0.65f, -0.375f)
};
// add your code here
// ......
divideTriangle(vertices[0], vertices[1], vertices[2], m_subdivisions);
m_numPoints = m_points.size(); // save number of vertices
static GLuint vertexBuffer = -1;
glGenBuffers(1, &vertexBuffer);
// bind the buffer to the GPU; all future drawing calls gets data from this buffer
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
// copy the vertices from CPU to GPU
glBufferData(GL_ARRAY_BUFFER, m_numPoints*sizeof(vec2), &m_points[0], GL_STATIC_DRAW);
glVertexAttribPointer(ATTRIB_VERTEX, 2, GL_FLOAT, false, 0, NULL);
glEnableVertexAttribArray(ATTRIB_VERTEX);
//Create texture coordinates buffer
static GLuint texCoordBuffer = -1;
glGenBuffers(1, &texCoordBuffer);
glBindBuffer(GL_ARRAY_BUFFER, texCoordBuffer);
glBufferData(GL_ARRAY_BUFFER, m_numPoints*sizeof(vec2), &m_coords[0], GL_STATIC_DRAW);
glVertexAttribPointer(ATTRIB_TEXTURE_POSITION, 2, GL_FLOAT, false, 0, NULL);
glEnableVertexAttribArray(ATTRIB_TEXTURE_POSITION);
m_points.clear();
m_coords.clear();
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// HW1b::setTheta:
//
// Slot function to change rotate angle.
//
void
HW1b::setTheta(int angle)
{
// update slider and spinbox
m_thetaSlider-> blockSignals(true);
m_thetaSlider-> setValue(angle);
m_thetaSlider-> blockSignals(false);
m_thetaSpinBox-> blockSignals(true);
m_thetaSpinBox-> setValue(angle);
m_thetaSpinBox-> blockSignals(false);
// convert angle to radians
m_angle = angle * (M_PI / 180.);
// populate m_points
m_points.clear();
divideTriangle(m_init_points[0], m_init_points[1], m_init_points[2], m_subdivideSlider->value());
// redraw
updateGL();
}
