12 files changed, 70 insertions, 63 deletions
diff --git a/experimental/tectonics/Makefile b/experimental/tectonics/Makefile
index 877fec1..ab8fb0d 100644
--- a/experimental/tectonics/Makefile
+++ b/experimental/tectonics/Makefile
@@ -5,8 +5,8 @@ DEPS=tectonics.h
 %.o: %.c $(DEPS)
 	$(CC) -c -o $@ $< $(CFLAGS)
 
-all: world.o util.o tectonics.o quadtree.o
-		$(CC) -o tectonics world.o util.o tectonics.o quadtree.o $(CFLAGS)
+all: world.o util.o tectonics.o quadtree.o drawing.o
+		$(CC) -o tectonics world.o util.o tectonics.o quadtree.o drawing.o $(CFLAGS)
 
 test: all quadtree.o quadtree.test.o tests.o
 		$(CC) -o tests world.o util.o quadtree.o quadtree.test.o tests.o $(CFLAGS)
diff --git a/experimental/tectonics/drawing.c b/experimental/tectonics/drawing.c
new file mode 100644
index 0000000..91f873b
--- /dev/null
+++ b/experimental/tectonics/drawing.c
@@ -0,0 +1,56 @@
+#include <stddef.h>
+#include <math.h>
+
+#include "tectonics.h"
+#include "geometry.h"
+#include "drawing.h"
+
+void get_cairo_size(cairo_t *cr, int *width, int *height)
+{
+   cairo_surface_t *surface = cairo_get_target(cr);
+   *width = cairo_image_surface_get_width(surface);
+   *height = cairo_image_surface_get_height(surface);
+}
+
+
+void draw_world(cairo_t *cr, struct world_t *world)
+{
+   int width, height;
+   get_cairo_size(cr, &width, &height);
+   double r = ((double)width) / (100*sqrt(world->n_points));
+   cairo_set_source_rgba(cr, 1, 0, 0, 1);
+
+   for (int i=0; i<world->n_points; i++) {
+      struct point_t *pt = world->points + i;
+      double xc = pt->x * width;
+      double yc = pt->y * height;
+      cairo_arc(cr, xc, yc, r, 0, 2*M_PI);
+      cairo_stroke(cr);
+   }
+
+   //draw_quadtree(cr, &(world->tree));
+}
+
+
+void draw_quadtree(cairo_t *cr, struct quadtree_node_t *node)
+{
+   int width, height;
+   get_cairo_size(cr, &width, &height);
+
+   cairo_set_source_rgba(cr, 0, 0, 1, 1);
+   struct point_t center = node->region.center;
+   double half_dim = node->region.half_dim;
+
+   double x = (center.x - half_dim) * width;
+   double y = (center.y - half_dim) * height;
+   
+   cairo_rectangle(cr, x, y, 2*half_dim * width, 2*half_dim * height);
+   cairo_stroke(cr);
+
+   if (node->nw != NULL) {
+      draw_quadtree(cr, node->nw);
+      draw_quadtree(cr, node->ne);
+      draw_quadtree(cr, node->sw);
+      draw_quadtree(cr, node->se);
+   }
+}
diff --git a/experimental/tectonics/drawing.h b/experimental/tectonics/drawing.h
new file mode 100644
index 0000000..e1a1126
--- /dev/null
+++ b/experimental/tectonics/drawing.h
@@ -0,0 +1,10 @@
+#ifndef DRAWING_H
+#define DRAWING_H
+
+#include <cairo.h>
+
+void get_cairo_size(cairo_t *cr, int *width, int *height);
+void draw_quadtree(cairo_t *cr, struct quadtree_node_t *root);
+void draw_world(cairo_t *cr, struct world_t *world);
+
+#endif
diff --git a/experimental/tectonics/geometry.h b/experimental/tectonics/geometry.h
index 09bd7c8..de01042 100644
--- a/experimental/tectonics/geometry.h
+++ b/experimental/tectonics/geometry.h
@@ -2,7 +2,6 @@
 #define GEOMETRY_H
 
 #include <stdbool.h>
-#include <cairo.h>
 
 struct point_t {
    double x, y;
@@ -60,8 +59,6 @@ int quadtree_get_closest(struct quadtree_node_t *root,
 			 struct point_t *points,
 			 struct point_t pt);
 
-void draw_quadtree(cairo_t *cr, struct quadtree_node_t *root);
-
 /* free a quadtree structure
  *
  * note that this will *NOT* free any point userdata!
diff --git a/experimental/tectonics/output-relaxed.png b/experimental/tectonics/output-relaxed.png
deleted file mode 100644
index f53c0d1..0000000
--- a/experimental/tectonics/output-relaxed.png
+++ /dev/null
diff --git a/experimental/tectonics/output.png b/experimental/tectonics/output.png
deleted file mode 100644
index 1fddaf3..0000000
--- a/experimental/tectonics/output.png
+++ /dev/null
diff --git a/experimental/tectonics/quadtree.c b/experimental/tectonics/quadtree.c
index 820844d..45f11ac 100644
--- a/experimental/tectonics/quadtree.c
+++ b/experimental/tectonics/quadtree.c
@@ -167,30 +167,6 @@ int quadtree_get_closest(struct quadtree_node_t *node,
 }
 
 
-void draw_quadtree(cairo_t *cr, struct quadtree_node_t *node)
-{
-   int width, height;
-   get_cairo_size(cr, &width, &height);
-
-   cairo_set_source_rgba(cr, 0, 0, 1, 1);
-   struct point_t center = node->region.center;
-   double half_dim = node->region.half_dim;
-
-   double x = (center.x - half_dim) * width;
-   double y = (center.y - half_dim) * height;
-   
-   cairo_rectangle(cr, x, y, 2*half_dim * width, 2*half_dim * height);
-   cairo_stroke(cr);
-
-   if (node->nw != NULL) {
-      draw_quadtree(cr, node->nw);
-      draw_quadtree(cr, node->ne);
-      draw_quadtree(cr, node->sw);
-      draw_quadtree(cr, node->se);
-   }
-}
-
-
 void quadtree_free(struct quadtree_node_t *node)
 {
    if (node->nw != NULL) {
diff --git a/experimental/tectonics/tectonics.c b/experimental/tectonics/tectonics.c
index e43a425..7d5342a 100644
--- a/experimental/tectonics/tectonics.c
+++ b/experimental/tectonics/tectonics.c
@@ -1,6 +1,7 @@
 #include <cairo.h>
 
 #include "tectonics.h"
+#include "drawing.h"
 
 #define X_RES 1024
 #define Y_RES X_RES
@@ -14,7 +15,7 @@ int main()
    create_world(&world, 10000);
    if (world.points == NULL)
       return 1;
-   render_world(cr, &world);
+   draw_world(cr, &world);
    free_world(&world);
    
    cairo_destroy(cr);
diff --git a/experimental/tectonics/tectonics.h b/experimental/tectonics/tectonics.h
index de5b18a..bbde9dd 100644
--- a/experimental/tectonics/tectonics.h
+++ b/experimental/tectonics/tectonics.h
@@ -3,7 +3,6 @@
 
 #include <stdlib.h>
 #include <stdbool.h>
-#include <cairo.h>
 
 #include "geometry.h"
 
@@ -22,7 +21,6 @@ struct world_t {
 
 void create_world(struct world_t *world, int n_points);
 void free_world(struct world_t *world);
-void render_world(cairo_t *cr, struct world_t *world);
 void run_world_step(struct world_t *world);
 
 #endif
diff --git a/experimental/tectonics/util.c b/experimental/tectonics/util.c
index 0bbe880..aa528fb 100644
--- a/experimental/tectonics/util.c
+++ b/experimental/tectonics/util.c
@@ -3,14 +3,6 @@
 
 #include "util.h"
 
-void get_cairo_size(cairo_t *cr, int *width, int *height)
-{
-   cairo_surface_t *surface = cairo_get_target(cr);
-   *width = cairo_image_surface_get_width(surface);
-   *height = cairo_image_surface_get_height(surface);
-}
-
-
 double rand01()
 {
    return ((double) rand())/RAND_MAX;
diff --git a/experimental/tectonics/util.h b/experimental/tectonics/util.h
index 1a5a505..762229b 100644
--- a/experimental/tectonics/util.h
+++ b/experimental/tectonics/util.h
@@ -1,10 +1,8 @@
 #ifndef UTIL_H
 #define UTIL_H
 
-#include <cairo.h>
 #include "geometry.h"
 
-void get_cairo_size(cairo_t *cr, int *width, int *height);
 double rand01();
 double distance(struct point_t p1, struct point_t p2);
 
diff --git a/experimental/tectonics/world.c b/experimental/tectonics/world.c
index 5aead24..5aa485c 100644
--- a/experimental/tectonics/world.c
+++ b/experimental/tectonics/world.c
@@ -131,24 +131,3 @@ void free_world(struct world_t *world)
    }
    free(world->points);
 }
-
-
-/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
-
-void render_world(cairo_t *cr, struct world_t *world)
-{
-   int width, height;
-   get_cairo_size(cr, &width, &height);
-   double r = ((double)width) / (100*sqrt(world->n_points));
-   cairo_set_source_rgba(cr, 1, 0, 0, 1);
-
-   for (int i=0; i<world->n_points; i++) {
-      struct point_t *pt = world->points + i;
-      double xc = pt->x * width;
-      double yc = pt->y * height;
-      cairo_arc(cr, xc, yc, r, 0, 2*M_PI);
-      cairo_stroke(cr);
-   }
-
-   //draw_quadtree(cr, &(world->tree));
-}