SF.net SVN: alleg:[10355] allegro/branches/4.9/examples

[<tj...@us...>]

Revision: 10355
          http://alleg.svn.sourceforge.net/alleg/?rev=10355&view=rev
Author:   tjaden
Date:     2008-08-14 12:37:40 +0000 (Thu, 14 Aug 2008)

Log Message:
-----------
Add an example program to test al_draw_line().

Modified Paths:
--------------
    allegro/branches/4.9/examples/CMakeLists.txt

Added Paths:
-----------
    allegro/branches/4.9/examples/exnew_lines.c

Modified: allegro/branches/4.9/examples/CMakeLists.txt
===================================================================
--- allegro/branches/4.9/examples/CMakeLists.txt	2008-08-14 09:19:52 UTC (rev 10354)
+++ allegro/branches/4.9/examples/CMakeLists.txt	2008-08-14 12:37:40 UTC (rev 10355)
@@ -59,6 +59,7 @@
 example(exnew_dualies)
 example(exnew_fs_resize)
 example(exnew_icon)
+example(exnew_lines)
 example(exnew_lockbitmap)
 example(exnew_lockscreen)
 example(exnew_monitorinfo)

Added: allegro/branches/4.9/examples/exnew_lines.c
===================================================================
--- allegro/branches/4.9/examples/exnew_lines.c	                        (rev 0)
+++ allegro/branches/4.9/examples/exnew_lines.c	2008-08-14 12:37:40 UTC (rev 10355)
@@ -0,0 +1,119 @@
+/*
+ * This example exercises line drawing, and single buffer mode.
+ */
+
+#include "allegro5/allegro5.h"
+
+/* Define this to test drawing to memory bitmaps.
+ * XXX currently al_draw_line() crashes when drawing to memory bitmaps
+ *
+ * Once event `display' fields are working we can just open up two windows,
+ * one to test drawing to the backbuffer and one to test drawing to a memory
+ * buffer.
+ */
+/* #define TEST_MEMBMP */
+
+const int W = 640;
+const int H = 480;
+
+ALLEGRO_DISPLAY *display;
+ALLEGRO_EVENT_QUEUE *queue;
+ALLEGRO_COLOR background;
+#ifdef TEST_MEMBMP
+   ALLEGRO_BITMAP *memory_bitmap;
+#endif
+
+int last_x = -1;
+int last_y = -1;
+
+
+void plonk(const int x, const int y)
+{
+#ifdef TEST_MEMBMP
+   al_set_target_bitmap(memory_bitmap);
+#else
+   al_set_target_bitmap(al_get_backbuffer());
+#endif
+
+   al_set_blender(ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA, background);
+   al_draw_rectangle(0, 0, W, H, al_map_rgba_f(1, 1, 1, 0.2), ALLEGRO_FILLED);
+
+   al_set_blender(ALLEGRO_ONE, ALLEGRO_ZERO, al_map_rgb_f(1, 1, 1));
+   al_draw_rectangle(x - 2, y - 2, x + 2, y + 2, al_map_rgb_f(1, 0, 0),
+      ALLEGRO_FILLED);
+   if (last_x != -1 && last_y != -1) {
+      al_draw_line(last_x, last_y, x, y, al_map_rgb_f(1, 1, 1));
+   }
+
+#ifdef TEST_MEMBMP
+   al_set_target_bitmap(al_get_backbuffer());
+   al_draw_bitmap(memory_bitmap, 0.0, 0.0, 0);
+#endif
+
+   al_flip_display();
+
+   last_x = x;
+   last_y = y;
+}
+
+int main(void)
+{
+   ALLEGRO_EVENT event;
+
+   al_init();
+   al_install_keyboard();
+   al_install_mouse();
+
+   al_set_new_display_flags(ALLEGRO_SINGLEBUFFER);
+   display = al_create_display(W, H);
+   if (!display) {
+      allegro_message("Error creating display");
+      return 1;
+   }
+
+   background = al_map_rgb_f(0.5, 0.5, 0.6);
+
+#ifdef TEST_MEMBMP
+   al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
+   memory_bitmap = al_create_bitmap(W, H);
+   if (!memory_bitmap) {
+      allegro_message("Error creating memory bitmap");
+      return 1;
+   }
+   al_set_target_bitmap(memory_bitmap);
+   al_clear(background);
+#endif
+
+   al_set_target_bitmap(al_get_backbuffer());
+   al_clear(background);
+   al_flip_display();
+
+   queue = al_create_event_queue();
+   al_register_event_source(queue, (ALLEGRO_EVENT_SOURCE *) al_get_keyboard());
+   al_register_event_source(queue, (ALLEGRO_EVENT_SOURCE *) al_get_mouse());
+
+   while (true) {
+      al_wait_for_event(queue, &event);
+      if (event.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN) {
+         plonk(event.mouse.x, event.mouse.y);
+      }
+      else if (event.type == ALLEGRO_EVENT_DISPLAY_SWITCH_OUT) {
+         last_x = last_y = -1;
+      }
+      else if (event.type == ALLEGRO_EVENT_KEY_DOWN &&
+         event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
+      {
+         break;
+      }
+   }
+
+   al_destroy_event_queue(queue);
+#ifdef TEST_MEMBMP
+   al_destroy_bitmap(memory_bitmap);
+#endif
+
+   return 0;
+}
+END_OF_MAIN()
+
+/* vim: set sts=3 sw=3 et: */


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