Add GLSphere with a points cloud

1 files changed, 52 insertions, 0 deletions

diff --git a/src/glsphere.cpp b/src/glsphere.cpp
new file mode 100644
index 0000000..d77ef95
--- /dev/null
+++ b/src/glsphere.cpp
@@ -0,0 +1,52 @@
+#include "glsphere.h"
+
+GLSphere::GLSphere(double radius, int stacks, int slices)
+    : GLBody(radius)
+{
+    m_stacks = stacks;
+    m_slices = slices;
+}
+
+void GLSphere::makeSurface(QVector<GLPoint> *pointContainer,
+                           QVector<GLshort> *indexContainer)
+{
+    GLBody::makeSurface(pointContainer, indexContainer);
+
+    QVector3D n0 = v_XYZ; //dummy normal
+    QVector3D t0 = QVector3D(0.0, 0.0, 0.0); //dummy texture
+
+    QVector3D northpol = v_Y * m_radius;
+    QVector3D southpol = -v_Y * m_radius;
+
+    m_firstPoint = m_points->size();
+
+    for (int slice = 1; slice < m_slices; slice += 2)
+    {
+        m_points->append(GLPoint(northpol, n0, t0, GLColorRgba::clMagenta));
+
+        for (int stack = 1; stack < m_stacks; stack++)
+        {
+            m_points->append(GLPoint(calculatePoint(2 * M_PI * slice / m_slices,
+                                                    stack * M_PI / m_stacks), n0, t0,
+                                     m_color));
+
+            m_points->append(GLPoint(calculatePoint(2 * M_PI * (slice - 1) / m_slices,
+                                                    stack * M_PI / m_stacks), n0, t0,
+                                     m_color));
+
+        }
+
+        m_points->append(GLPoint(southpol, n0, t0, GLColorRgba::clMagenta));
+    }
+
+    m_nextPoint = m_points->size();
+}
+
+QVector3D GLSphere::calculatePoint(double sliceRotation, double stackRotation)
+{
+    double x = m_radius * sin(stackRotation) * sin(sliceRotation);
+    double y = m_radius * cos(stackRotation);
+    double z = m_radius * sin(stackRotation) * cos(sliceRotation);
+
+    return QVector3D(x, y, z);
+}