added the rgb function to upiwin and started building the demo script

scripts/demo1.py

@@ -0,0 +1,58 @@
+# Demo script that implements a simple drawing program
+import upiwin
+
+# Save off some color values.
+WHITE = upiwin.rgb(255, 255, 255)
+LTGRAY = upiwin.rgb(204, 204, 204)
+YELLOW = upiwin.rgb(255, 255, 0)
+
+hdc = upiwin.DevCtxt(type='screen')
+
+# divide the screen into "drawing" and "command" areas
+drawing_rect = hdc.get_clip_rect()
+command_rect = drawing_rect
+drawing_rect[2] -= 60;
+command_rect[0] = drawing_rect[2] + 1
+
+# further divide up the "command" area
+cmd1_rect = command_rect
+cmd2_rect = command_rect
+cmd3_rect = command_rect
+cmd4_rect = command_rect
+cmd1_rect[3] = 60;
+cmd2_rect[1] = 60;
+cmd2_rect[3] = 120;
+cmd3_rect[1] = 120;
+cmd3_rect[3] = 180;
+cmd4_rect[1] = 180;
+
+def point_in_rect(rect, x, y):
+	return (x >= rect[0]) and (x < rect[2]) and (y >= rect[1]) and (y < rect[3])
+
+
+
+
+# --- Initialize and start message loop ---
+
+# Draw the basic layout.
+hdc.set_text_color(LTGRAY)
+hdc.rectangle(cmd1_rect[0], cmd1_rect[1], cmd1_rect[2], cmd1_rect[3])
+hdc.rectangle(cmd2_rect[0], cmd2_rect[1], cmd2_rect[2], cmd2_rect[3])
+hdc.rectangle(cmd3_rect[0], cmd3_rect[1], cmd3_rect[2], cmd3_rect[3])
+hdc.rectangle(cmd4_rect[0], cmd4_rect[1], cmd4_rect[2], cmd4_rect[3])
+
+# Main message loop
+msg = {}
+while upiwin.get_message(msg):
+	if msg['message'] == upiwin.WM_TOUCHCLICK:
+		if point_in_rect(cmd1_rect, msg['attrs'][0], msg['attrs'][1]):
+			print("Click command 1")
+		elif point_in_rect(cmd2_rect, msg['attrs'][0], msg['attrs'][1]):
+			print("Click command 2")
+		elif point_in_rect(cmd3_rect, msg['attrs'][0], msg['attrs'][1]):
+			print("Click command 3")
+		elif point_in_rect(cmd4_rect, msg['attrs'][0], msg['attrs'][1]):
+			print("Click command 4")
+	elif msg['message'] == upiwin.WM_HWBUTTONCLICK:
+		if msg['attrs'][0] == 4:			# Button 4 = Exit app
+			upiwin.post_quit_message(0)

src/Makefile

@@ -2,7 +2,7 @@ BUILDUTILS=../buildutils
 RESOURCES=../resources
 SPLASHSCREEN=splash-vmwcblk.png
 
-OBJS=main.o sysinput.o ep_init.o ep_upiwin.o ep_backlight.o ep_msg.o ep_devctxt.o ep_bitmap.o \
+OBJS=main.o sysinput.o ep_init.o ep_upiwin.o ep_backlight.o ep_msg.o ep_graphics.o ep_devctxt.o ep_bitmap.o \
      ep_upiwin_tmp.o ep_util.o fbinit.o rect.o gfxobj.o devctxt.o dc_screen.o fontengine.o \
 	 bitmap.o fbprimitive.o log.o gpio.o msg_queue.o time_func.o config.o splash.o
 LIBS=-lpython3.7m -lcrypt -lfreetype -lbcm2835 -lpthread -ldl -lutil -lm

src/ep_graphics.c

@@ -0,0 +1,13 @@
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include "wintype.h"
+#include "gfxtype.h"
+
+PyObject *Epython_rgb(PyObject *self, PyObject *args)
+{
+  UINT32 r, g, b;
+  
+  if (!PyArg_ParseTuple(args, "kkk", &r, &g, &b))
+    return NULL;
+  return PyLong_FromUnsignedLong(RGB(r, g, b));
+}

src/ep_upiwin.c

@@ -23,6 +23,9 @@ static PyMethodDef UPIWINMethods[] = {
    "Retrieves a message from the message queue, blocking if necessary."},
   {"post_quit_message", Epython_post_quit_message, METH_VARARGS,
    "Posts a WM_QUIT message to the message queue, with an exit code."},
+  /* Graphics functions */
+  {"rgb", Epython_rgb, METH_VARARGS,
+   "Creates a color value from separate red, green, and blue indexes."},
   {NULL, NULL, 0, NULL}
 };
 

src/ep_upiwin.h

@@ -22,5 +22,7 @@ extern PyObject *Epython_set_backlight_level(PyObject *self, PyObject *args);
 extern PyObject *Epython_get_message(PyObject *self, PyObject *args);
 extern PyObject *Epython_post_quit_message(PyObject *self, PyObject *args);
 
+/* ep_graphics.c */
+extern PyObject *Epython_rgb(PyObject *self, PyObject *args);
 
 #endif /* __EP_UPIWIN_H_INCLUDED */