From 91e322ca508df43b9d5498b0f48839a79177ac90 Mon Sep 17 00:00:00 2001
From: Jeff Armstrong <jeffrey.armstrong@approximatrix.com>
Date: Tue, 26 Jul 2011 22:51:42 -0400
Subject: Added initial skeleton app that displays PNGs and kinda works.

---
 example/pngview.py | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 example/pngview.py

(limited to 'example/pngview.py')

diff --git a/example/pngview.py b/example/pngview.py
new file mode 100644
index 0000000..d53e166
--- /dev/null
+++ b/example/pngview.py
@@ -0,0 +1,130 @@
+import gem
+import gem.vdi
+
+import sys
+
+import png
+
+# Taken from resource headers
+MENU = 0
+M_ABOUT = 7
+M_QUIT = 16
+ABOUT = 1
+B_ABOUT_OK = 1
+
+def redraw(window,data):
+
+    window.begin_update()
+    vh = window.graphics_handle()
+    
+    rgbdata = data[2]
+    
+    wrect = window.get_work_rect()
+    
+    for r in window.get_invalid_rectangles():
+        todraw = window.intersect_work_area(r)
+        if todraw is not None:
+            gem.vdi.vs_clip(vh, True, todraw)
+            image_y = 0
+            for r in rgbdata:
+                image_x = 0
+                
+                pvalue = 0
+                pcount = 0
+                for c in r:
+                
+                    pvalue = pvalue + c
+                    pcount = pcount + 1
+                    
+                    if pcount == 3:
+                
+                        pvalue = pvalue / 3
+                
+                        if c > pvalue:
+                            gem.vdi.vsf_color(vh,0)
+                        else:
+                            gem.vdi.vsf_color(vh,1)
+                        x = wrect[0] + image_x
+                        y = wrect[1] + image_y
+                        gem.vdi.bar(vh,(x,y,1,1))
+                        image_x = image_x + 1
+                        #if image_x > data[0]:
+                        #    raise RuntimeError("Point {0} exceeds limit {1}".format(image_x,data[0]))
+                        pcount = 0
+                        pvalue = 0
+                        
+                image_y = image_y + 1
+            
+            gem.vdi.vs_clip(vh, False, todraw)
+
+    window.end_update()
+
+class AppMessageEvent(gem.MessageEvent):
+    def __init__(self,app):
+        gem.MessageEvent.__init__(self)
+        
+        self.app = app
+        self.window = app.windows[0]
+    
+    def handle_menu(self, item, title=None):
+        if item == M_QUIT:
+            self.app.send_message((gem.WM_CLOSED, 0, 0, self.window.id))
+            
+        elif item == M_ABOUT:
+            dlg = self.app.get_resource_address(gem.R_TREE,ABOUT)
+            self.app.draw_tree(dlg,2)
+            self.app.form_do(dlg)
+        
+        if title is not None:
+            self.app.set_menu_state(title)
+    
+    def process(self):
+        
+        # First call the super's process()
+        gem.MessageEvent.process(self)
+        
+        if self.message == gem.WM_CLOSED:
+            self.app.event_processing = False
+        
+        elif self.message == gem.WM_TOPPED:
+            self.window.top()
+            
+        elif self.message == gem.WM_MOVED or self.message == gem.WM_SIZED:
+            rect = (self.get_word(4),self.get_word(5),self.get_word(6),self.get_word(7))
+            self.window.resize(rect)
+            
+        elif self.message == gem.WM_REDRAW:
+            redraw(self.window,self.app.data)
+        
+        # Menu handling
+        elif self.message == gem.MN_SELECTED:
+            self.handle_menu(self.get_word(4),title=self.get_word(3))
+
+def start_app(filename):
+
+    reader = png.Reader(filename)
+    data = reader.asRGB8()
+
+    app = gem.Application()
+    app.load_resource("simple.rsc")
+    app.set_menu(MENU)
+
+    app.data = data
+
+    w = app.new_window((0,10,data[0],data[1]),filename,
+                       type=gem.NAME|gem.MOVER|gem.CLOSER)
+    
+    app.message_event = AppMessageEvent(app)
+    
+    app.event_loop()
+    
+    app.destroy()
+    
+
+if __name__ == "__main__":
+    print("Simple PNG Viewer for GEM")
+    if len(sys.argv) < 2:
+        print("Usage: {0} <png filename>".format(sys.argv[0]))
+    else:
+        print("Now processing {0}".format(sys.argv[1]))
+        start_app(sys.argv[1])
\ No newline at end of file
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