draw markers to backend

svn path=/trunk/matplotlib/; revision=938

Author: jdh2358

API_CHANGES

@@ -25,6 +25,8 @@ API CHANGES in matplotlib-0.72
 
    subs=none now does autosubbing in the tick locator.
 
+   removed BBoxTransformation
+
 API CHANGES in matplotlib-0.71   
 
    Significant numerix namespace changes, introduced to resolve

CHANGELOG

@@ -1,5 +1,8 @@
 New entries should be added at the top
 
+2005-02-07 Added newstyle path drawing for markers - only implemented
+           in agg currently - JDH
+
 2005-02-05 Some superscript text optimizations for ticking log plots
 
 2005-02-05 Added some default key press events to pylab figures: 'g'

TODO

@@ -671,7 +671,7 @@ square).  All displayed area is white.
 - measuring ruler? (see gnuplot's 'r' hotkey in X11).
 
 - button to add text labels easily anywhere on the plot.  A few drawing
-buttons as well for simple things? Circle/ellipse, box, arrows, etc.
+  buttons as well for simple things? Circle/ellipse, box, arrows, etc.
 
 - toggle log/linear shows strange accumulation of ticks on y axis
 
@@ -682,4 +682,6 @@ buttons as well for simple things? Circle/ellipse, box, arrows, etc.
     #set(gca(), xscale='log')
     show()
 
---pyparsing a performance bottleneck for log ticks
+-- DONE pyparsing a performance bottleneck for log ticks
+
+-- draw point and draw pixel currently broken for new style markers

examples/backend_driver.py

@@ -106,7 +106,7 @@ def drive(backend, python='python2.3'):
 #backends = ['Agg', 'Cairo', 'GDK', 'PS', 'SVG', 'Template']
 #backends = ['Agg', 'PS', 'SVG', 'Template']
 #backends = [ 'GTK', 'WX', 'TkAgg']
-backends = ['Agg']
+backends = ['Agg', 'PS']
 python = 'python2.3'
 for backend in backends:
     print 'testing %s' % backend

examples/simple_plot.py

@@ -12,6 +12,6 @@
 title('About as simple as it gets, folks')
 grid(True)
 #axis([0,1,-1,1])
-#savefig('simple_plot')
+savefig('simple_plot')
 
 show()

lib/matplotlib/backends/backend_ps.py

@@ -281,6 +281,51 @@ def draw_line(self, gc, x0, y0, x1, y1):
         ps = '%1.3f %1.3f m %1.3f %1.3f l'%(x0, y0, x1, y1)
         self._draw_ps(ps, gc, None, "line")
 
+    def _draw_markers(self, gc, path, x, y, transform):
+        """
+        Draw the markers defined by path at each of the positions in x
+        and y.  path coordinates are points, x and y coords will be
+        transformed by the transform
+        """
+        if debugPS:
+            self._pswriter.write("% markers\n")
+
+        if transform.need_nonlinear():
+            x,y = transform.nonlinear_only_numerix(x, y)
+
+        # the a,b,c,d,tx,ty affine which transforms x and y
+        vec6 = transform.as_vec6_val()
+        # this defines a single vertex.  We need to define this as ps
+        # function, properly stroked and filled with linewidth etc,
+        # and then simply iterate over the x and y and call this
+        # function at each position.  Eg, this is the path that is
+        # relative to each x and y offset.
+        ps = []
+        for p in path:
+            code = p[0]
+            if code==MOVETO:
+                mx, my = p[1:]
+                ps.append('%1.3f %1.3f m')
+            elif code==LINETO:
+                mx, my = p[1:]
+                ps.append('%1.3f %1.3f l')
+            elif code==ENDPOLY:
+                fill = p[1]
+                if fill:  # we can get the fill color here
+                    rgba = p[2:]
+                    
+        vertfunc = 'some magic ps function that draws the marker relative to an x,y point'
+        # the gc contains the stroke width and color as always
+        for i in xrange(len(x)):
+            # for large numbers of markers you may need to chunk the
+            # output, eg dump the ps in 1000 marker batches
+            thisx = x[i]
+            thisy = y[i]
+            # apply affine transform x and y to define marker center
+            #draw_marker_here
+
+        print 'I did nothing!'
+
     def _draw_lines(self, gc, points):
         """
         Draw many lines.  'points' is a list of point coordinates.