added PNG output

apple410/cmdline.py

@@ -62,3 +62,17 @@ def plot2svg():
     p.read(f)
     p.write()
     
+def plot2png():
+    parser = argparse.ArgumentParser("plot2png",
+            description="Convert a set of Apple 410 Color Plotter commands to a PNG")
+    parser.add_argument('PLOT', help='The plotter file to process. "-" will read plotter commands from standard input.')
+    args = parser.parse_args()
+    if args.PLOT == '-':
+        f = sys.stdin
+    else:
+        f = open(args.PLOT)
+    p = CairoPlotter(sys.stdout.buffer,'PNG')
+    p.read(f)
+    p.write()
+    
+

apple410/plot_to_cairo.py

@@ -22,9 +22,18 @@ LW = 5
 
 class CairoPlotter:
 
-    def __init__(self, path):
-        self.surface = cairo.SVGSurface(path, W, H)
+    def __init__(self, path, surftype = 'SVG'):
+        self.surftype = surftype
+        if surftype == 'SVG':
+            self.surface = cairo.SVGSurface(path, W, H)
+        elif surftype == 'PNG':
+            self.path = path
+            self.surface = cairo.ImageSurface(cairo.Format.RGB24,W,H)
         self.context = cairo.Context(self.surface)
+        if surftype == 'PNG':
+            self.context.rectangle(0,0,W,H)
+            self.context.set_source_rgb(1.0,1.0,1.0)
+            self.context.fill()
         #self.context.scale(W,H)
         self.context.select_font_face("monospace")
         self.pennum = 0
@@ -141,6 +150,11 @@ class CairoPlotter:
 
     def write(self):
         self.finish_path()
+        if self.surftype == 'PNG':
+            if self.path == '-':
+                self.surface.write_to_png(sys.stdout)
+            else:
+                self.surface.write_to_png(self.path)
         self.surface.finish()
 
     def process_cmd(self,command):

setup.py

@@ -55,6 +55,7 @@ setup(
                 'apple410=apple410.cmdline:main',
                 'a410svg2plot=apple410.cmdline:svg2plot',
                 'a410plot2svg=apple410.cmdline:plot2svg',
+                'a410plot2png=apple410.cmdline:plot2png',
                 ],
             },
     )