X-Git-Url: http://git.treefish.org/~alex/seamulator.git/blobdiff_plain/94e405360849659ff951816a13cf510f11a7eee7..f2e44f70d56b60e6eef78656ca4b558917474276:/watersurface.cpp

diff --git a/watersurface.cpp b/watersurface.cpp
index f9e7803..a38ad57 100644
--- a/watersurface.cpp
+++ b/watersurface.cpp
@@ -1,6 +1,10 @@
 #include "watersurface.h"
 
-WaterSurface::WaterSurface(int size) : m_size{size}
+#include <GL/glut.h>
+
+WaterSurface::WaterSurface(int size, double extend) :
+  m_size{size},
+  m_extend{extend}
 {
   m_points.resize(size*size);
 }
@@ -10,7 +14,46 @@ SurfacePoint& WaterSurface::at(int x, int y)
   return m_points.at(x + m_size*y);
 }
 
+const SurfacePoint& WaterSurface::at(int x, int y) const
+{
+  return m_points.at(x + m_size*y);
+}
+
 int WaterSurface::size() const
 {
   return m_size;
 }
+
+double WaterSurface::extend() const
+{
+  return m_extend;
+}
+
+void WaterSurface::draw() const
+{
+  const double scaleFactor{m_extend / m_size};
+
+  glScalef(scaleFactor, scaleFactor, 1.0f);
+  glTranslatef(-(float)(m_size - 1) / 2, -(float)(m_size - 1) / 2, 0);
+
+  for (int y = 0; y < m_size - 1; ++y) {
+    for (int x = 0; x < m_size - 1; ++x) {
+      drawSingleTile(x, y);
+    }
+  }
+}
+
+void WaterSurface::drawSingleTile(int x, int y) const
+{
+  glBegin(GL_TRIANGLES);
+
+  glVertex3f(x, y, at(x, y).getHeight());
+  glVertex3f(x+1, y, at(x+1, y).getHeight());
+  glVertex3f(x+1, y+1, at(x+1, y+1).getHeight());
+
+  glVertex3f(x, y, at(x, y).getHeight());
+  glVertex3f(x, y+1, at(x, y+1).getHeight());
+  glVertex3f(x+1, y+1, at(x+1, y+1).getHeight());
+
+  glEnd();
+}