Rename some internal variables

src/viz.c

@@ -4,65 +4,65 @@
 #include <stdlib.h>
 #include <unistd.h> // usleep
 
-static size_t nobjects_clear;
-static FILE* viz_plot_pipe;
-static size_t viz_nrects;
-static rect_t viz_rects[NOBJECTS];
-static point_t viz_points[NOBJECTS];
-static size_t irect;
-static size_t ipoint;
+static size_t _nobjects_to_clear;
+static FILE* _plot_pipe;
+static size_t _nrects;
+static rect_t _viz_rects[NOBJECTS];
+static point_t _viz_points[NOBJECTS];
+static size_t _irect;
+static size_t _ipoint;
 
 void viz_init(unsigned width, unsigned height) {
     // don't close the window upon exit
-    viz_plot_pipe = popen("gnuplot -persistent", "w");
-    if (viz_plot_pipe == NULL) {
+    _plot_pipe = popen("gnuplot -persistent", "w");
+    if (_plot_pipe == NULL) {
         fprintf(stderr, "ERROR: gnuplot not found! Please try installing it!\n");
         exit(EXIT_FAILURE);
     }
-    fprintf(viz_plot_pipe, "set title 'Quadtree points and boundaries'\n");
-    fprintf(viz_plot_pipe, "set xrange [0:%u]\n", width);
-    fprintf(viz_plot_pipe, "set yrange [0:%u]\n", height);
-    fprintf(viz_plot_pipe, "set size square\n");
-    viz_nrects = 0;
-    nobjects_clear = 0;
-    irect = 0;
-    ipoint = 0;
+    fprintf(_plot_pipe, "set title 'Quadtree points and boundaries'\n");
+    fprintf(_plot_pipe, "set xrange [0:%u]\n", width);
+    fprintf(_plot_pipe, "set yrange [0:%u]\n", height);
+    fprintf(_plot_pipe, "set size square\n");
+    _nrects = 0;
+    _nobjects_to_clear = 0;
+    _irect = 0;
+    _ipoint = 0;
 }
 
 
 void viz_flush() {
-    nobjects_clear = (irect > nobjects_clear) ? irect : nobjects_clear;
+    _nobjects_to_clear = (_irect > _nobjects_to_clear) ? _irect : _nobjects_to_clear;
     // remove all previously drawn rectangles
-    for (size_t i = 0; i < nobjects_clear; ++i)
-        fprintf(viz_plot_pipe, "unset object %ld\n", i + 1);
-    for (int i = 0; i < irect; ++i) {
-        fprintf(viz_plot_pipe, "set object %d rect from %d,%d to %d,%d\n", 
-            i + 1, viz_rects[i].x0, viz_rects[i].y0, viz_rects[i].x1, viz_rects[i].y1);
+    for (size_t i = 0; i < _nobjects_to_clear; ++i)
+        fprintf(_plot_pipe, "unset object %ld\n", i + 1);
+    for (int i = 0; i < _irect; ++i) {
+        fprintf(_plot_pipe, "set object %d rect from %d,%d to %d,%d\n", 
+            i + 1, _viz_rects[i].x0, _viz_rects[i].y0, _viz_rects[i].x1, _viz_rects[i].y1);
     }
-    if (ipoint > 0) {
-        fprintf(viz_plot_pipe, "plot '-' with points pt 7 ps 1\n");
-        for (int i = 0; i < ipoint; ++i) {
-            fprintf(viz_plot_pipe, "%d %d\n", viz_points[i].x, viz_points[i].y); 
+    if (_ipoint > 0) {
+        fprintf(_plot_pipe, "plot '-' with points pt 7 ps 1\n");
+        for (int i = 0; i < _ipoint; ++i) {
+            fprintf(_plot_pipe, "%d %d\n", _viz_points[i].x, _viz_points[i].y); 
         }
-        fprintf(viz_plot_pipe, "e\n");  // End the input
+        fprintf(_plot_pipe, "e\n");  // End the input
     } else {
         fprintf(stderr, "Warning: No points to plot.\n");
     }
-    fprintf(viz_plot_pipe, "replot\n");
-    irect = ipoint = 0;
-    fflush(viz_plot_pipe);
+    fprintf(_plot_pipe, "replot\n");
+    _irect = _ipoint = 0;
+    fflush(_plot_pipe);
     usleep(16000);
 }
 
 
 void viz_write_rect(rect_t* rect) {
-    viz_rects[irect++] = *rect;
+    _viz_rects[_irect++] = *rect;
 }
 
 void viz_write_point(point_t* point) {
-    viz_points[ipoint++] = *point;
+    _viz_points[_ipoint++] = *point;
 }
 
 void viz_close() {
-    pclose(viz_plot_pipe);
+    pclose(_plot_pipe);
 }