33 files changed, 530 insertions, 113 deletions

diff --git a/src/model/state.h b/src/model/state.h
new file mode 100644
index 0000000..71185c8
--- a/dev/null
+++ b/src/model/state.h
@@ -0,0 +1,119 @@
+#ifndef STATE_H
+#define STATE_H
+
+#include "selection_info.h"
+#include "zoom_info.h"
+
+/*
+ * Buffer object identifiers.
+ */
+#define BASE_VERTICES 0
+#define BASE_COLORS 1
+
+#define CLEAR_COLOR 1.0, 1.0, 1.0, 1.0
+#define DRAW_COLOR 0.0, 0.0, 0.0
+
+#define DEFAULT_COLOR_R 0.00
+#define DEFAULT_COLOR_G 0.00
+#define DEFAULT_COLOR_B 0.01
+#define DEFAULT_COLOR_A (1.0 / 7.0)
+
+#define SELECT_COLOR_R 0.00
+#define SELECT_COLOR_G 0.00
+#define SELECT_COLOR_B 0.00
+#define SELECT_COLOR_A 0.75
+
+typedef enum
+{ PROTEIN_GEOMETRY, PROTEIN_SELECTED_GEOMETRY, DENSITY_LEGEND_GEOMETRY,
+  MAP_GEOMETRY
+} LISTS;
+#define NUM_LISTS 2
+
+/*
+ * Maintain state of the model.
+ */
+typedef struct
+{
+  /*
+   * Number of nodes having coordinates assigned.
+   */
+  unsigned int rows;
+
+  /* 
+   * Display lists.
+   */
+  unsigned int list_offset;
+
+  /* 
+   * Track the bounding box of the points.
+   */
+  struct
+  {
+    float min_x;
+    float max_x;
+    float min_y;
+    float max_y;
+  } bb;
+
+  /*
+   * Minimum coordinate for the orthographic projection. 
+   */
+  float ortho_min;
+
+  /*
+   * Maximum coordinate for the orthographic projection.
+   */
+  float ortho_max;
+
+  /*
+   * Orthographic coordinates after aspect preserving scaling.
+   */
+  struct
+  {
+    double min_x;
+    double max_x;
+    double min_y;
+    double max_y;
+  } ortho;
+
+  /*
+   * Viewport size.
+   */
+  struct
+  {
+    int w;
+    int h;
+  } viewport;
+
+  /*
+   * Buffer objects.
+   */
+  unsigned int buffers[1];
+
+  /*
+   * GI Identifiers indexed by row. Storage is [rows][20].
+   */
+  char *gi_data;
+
+  /*
+   * 2D coordinates for each protein. Storage is [rows][2].
+   */
+  float *base_vertices_data;
+
+  /*
+   * RGB color for each protein. Storage is [rows][4].
+   */
+  float *base_colors_data;
+
+  SELECTION_INFO selection;
+
+  ZOOM_INFO zoom;
+
+  /*
+   * Display a legend on the map.
+   */
+  bool legend;
+
+} STATE;
+
+#endif // STATE_H