RS274X backend for rendering. Incompelte still

4 files changed, 403 insertions, 4 deletions

diff --git a/gerber/gerber_statements.py b/gerber/gerber_statements.py
index 14a431b..bb190f4 100644
--- a/gerber/gerber_statements.py
+++ b/gerber/gerber_statements.py
@@ -226,6 +226,11 @@ class LPParamStmt(ParamStmt):
         param = stmt_dict['param']
         lp = 'clear' if stmt_dict.get('lp') == 'C' else 'dark'
         return cls(param, lp)
+    
+    @classmethod
+    def from_region(cls, region):
+        #todo what is the first param?
+        return cls(None, region.level_polarity)
 
     def __init__(self, param, lp):
         """ Initialize LPParamStmt class
@@ -258,7 +263,21 @@ class LPParamStmt(ParamStmt):
 class ADParamStmt(ParamStmt):
     """ AD - Gerber Aperture Definition Statement
     """
-
+    
+    @classmethod
+    def rect(cls, dcode, width, height):
+        '''Create a rectangular aperture definition statement'''
+        return cls('AD', dcode, 'R', ([width, height],))
+    
+    @classmethod
+    def circle(cls, dcode, diameter):
+        '''Create a circular aperture definition statement'''
+        return cls('AD', dcode, 'C', ([diameter],))
+    
+    @classmethod
+    def macro(cls, dcode, name):
+        return cls('AD', dcode, name, '')
+    
     @classmethod
     def from_dict(cls, stmt_dict):
         param = stmt_dict.get('param')
@@ -293,7 +312,9 @@ class ADParamStmt(ParamStmt):
         ParamStmt.__init__(self, param)
         self.d = d
         self.shape = shape
-        if modifiers:
+        if isinstance(modifiers, tuple):
+            self.modifiers = modifiers
+        elif modifiers:
             self.modifiers = [tuple([float(x) for x in m.split("X") if len(x)]) for m in modifiers.split(",") if len(m)]
         else:
             self.modifiers = [tuple()]
@@ -817,6 +838,14 @@ class CoordStmt(Statement):
     """ Coordinate Data Block
     """
 
+    OP_DRAW = 'D01'    
+    OP_MOVE = 'D02'
+    OP_FLASH = 'D03'
+    
+    FUNC_LINEAR = 'G01'
+    FUNC_ARC_CW = 'G02'
+    FUNC_ARC_CCW = 'G03'
+
     @classmethod
     def from_dict(cls, stmt_dict, settings):
         function = stmt_dict['function']
@@ -835,6 +864,22 @@ class CoordStmt(Statement):
         if j is not None:
             j = parse_gerber_value(stmt_dict.get('j'), settings.format, settings.zero_suppression)
         return cls(function, x, y, i, j, op, settings)
+    
+    @classmethod
+    def move(cls, func, point):
+        return cls(func, point[0], point[1], None, None, CoordStmt.OP_MOVE, None)
+    
+    @classmethod
+    def line(cls, func, point):
+        return cls(func, point[0], point[1], None, None, CoordStmt.OP_DRAW, None)
+    
+    @classmethod
+    def arc(cls, func, point, center):
+        return cls(func, point[0], point[1], center[0], center[1], CoordStmt.OP_DRAW, None)
+    
+    @classmethod
+    def flash(cls, point):
+        return cls(None, point[0], point[1], None, None, CoordStmt.OP_FLASH, None)
 
     def __init__(self, function, x, y, i, j, op, settings):
         """ Initialize CoordStmt class
@@ -1003,6 +1048,14 @@ class EofStmt(Statement):
 
 
 class QuadrantModeStmt(Statement):
+    
+    @classmethod
+    def single(cls):
+        return cls('single-quadrant')
+    
+    @classmethod
+    def multi(cls):
+        return cls('multi-quadrant')
 
     @classmethod
     def from_gerber(cls, line):
@@ -1031,6 +1084,14 @@ class RegionModeStmt(Statement):
         if 'G36' not in line and 'G37' not in line:
             raise ValueError('%s is not a valid region mode statement' % line)
         return (cls('on') if line[:3] == 'G36' else cls('off'))
+    
+    @classmethod
+    def on(cls):
+        return cls('on')
+    
+    @classmethod
+    def off(cls):
+        return cls('off')
 
     def __init__(self, mode):
         super(RegionModeStmt, self).__init__('RegionMode')
diff --git a/gerber/primitives.py b/gerber/primitives.py
index 84115a6..21efb55 100644
--- a/gerber/primitives.py
+++ b/gerber/primitives.py
@@ -17,8 +17,9 @@
 import math

 from operator import add, sub

 

-from .utils import validate_coordinates, inch, metric, rotate_point

+from .utils import validate_coordinates, inch, metric, rotate_point, nearly_equal

 from jsonpickle.util import PRIMITIVES

+from __builtin__ import False

 

 

 class Primitive(object):

@@ -120,6 +121,9 @@ class Primitive(object):
 

     def __eq__(self, other):

         return self.__dict__ == other.__dict__

+    

+    def to_statement(self):

+        pass

 

 

 class Line(Primitive):

@@ -216,7 +220,16 @@ class Line(Primitive):
     def offset(self, x_offset=0, y_offset=0):

         self.start = tuple(map(add, self.start, (x_offset, y_offset)))

         self.end = tuple(map(add, self.end, (x_offset, y_offset)))

+        

+    def equivalent(self, other, offset):

+        

+        if not isinstance(other, Line):

+            return False

+        

+        equiv_start = tuple(map(add, other.start, offset))

+        equiv_end = tuple(map(add, other.end, offset))

 

+        return nearly_equal(self.start, equiv_start) and nearly_equal(self.end, equiv_end)

 

 class Arc(Primitive):

     """

@@ -736,7 +749,7 @@ class AMGroup(Primitive):
             elif prim:

                self.primitives.append(prim)

         self._position = None

-        self._to_convert = ['arimitives']

+        self._to_convert = ['primitives']

         

     @property

     def flashed(self):

@@ -776,6 +789,21 @@ class AMGroup(Primitive):
             

         self._position = new_pos

         

+    def equivalent(self, other, offset):

+        '''

+        Is this the macro group the same as the other, ignoring the position offset?

+        '''

+        

+        if len(self.primitives) != len(other.primitives):

+            return False

+        

+        # We know they have the same number of primitives, so now check them all

+        for i in range(0, len(self.primitives)):

+            if not self.primitives[i].equivalent(other.primitives[i], offset):

+                return False

+            

+        # If we didn't find any differences, then they are the same

+        return True

 

 class Outline(Primitive):

     """

@@ -816,6 +844,20 @@ class Outline(Primitive):
         bounding_box = self.bounding_box()

         return bounding_box[1][1] - bounding_box[1][0]

 

+    def equivalent(self, other, offset):

+        '''

+        Is this the outline the same as the other, ignoring the position offset?

+        '''

+        

+        # Quick check if it even makes sense to compare them

+        if type(self) != type(other) or len(self.primitives) != len(other.primitives):

+            return False

+        

+        for i in range(0, len(self.primitives)):

+            if not self.primitives[i].equivalent(other.primitives[i], offset):

+                return False

+        

+        return True

 

 class Region(Primitive):

     """

diff --git a/gerber/render/rs274x_backend.py b/gerber/render/rs274x_backend.py
new file mode 100644
index 0000000..0094192
--- /dev/null
+++ b/gerber/render/rs274x_backend.py
@@ -0,0 +1,290 @@
+
+from .render import GerberContext
+from ..gerber_statements import *
+from ..primitives import AMGroup, Arc, Circle, Line, Rectangle
+
+class Rs274xContext(GerberContext):
+    
+    def __init__(self, settings):
+        GerberContext.__init__(self)
+        self.header = []
+        self.body = []
+        self.end = [EofStmt()]
+        
+        # Current values so we know if we have to execute
+        # moves, levey changes before anything else
+        self._level_polarity = None
+        self._pos = (None, None)
+        self._func = None
+        self._quadrant_mode = None
+        self._dcode = None
+        
+        self._next_dcode = 10
+        self._rects = {}
+        self._circles = {}
+        self._macros = {}
+        
+        self._i_none = 0
+        self._j_none = 0
+        
+        self._define_dcodes()
+        
+        
+    def _define_dcodes(self):
+        
+        self._get_circle(.1575, 10)
+        self._get_circle(.035, 17)
+        self._get_rectangle(0.1575, 0.1181, 15)
+        self._get_rectangle(0.0492, 0.0118, 16)
+        self._get_circle(.0197, 11)
+        self._get_rectangle(0.0236, 0.0591, 12)
+        self._get_circle(.005, 18)
+        self._get_circle(.008, 19)
+        self._get_circle(.009, 20)
+        self._get_circle(.01, 21)
+        self._get_circle(.02, 22)
+        self._get_circle(.006, 23)
+        self._get_circle(.015, 24)
+        self._get_rectangle(0.1678, 0.1284, 26)
+        self._get_rectangle(0.0338, 0.0694, 25)
+        
+    def _simplify_point(self, point):
+        return (point[0] if point[0] != self._pos[0] else None, point[1] if point[1] != self._pos[1] else None)
+    
+    def _simplify_offset(self, point, offset):
+        
+        if point[0] != offset[0]:
+            xoffset = point[0] - offset[0]
+        else:
+            xoffset = self._i_none
+            
+        if point[1] != offset[1]:
+            yoffset = point[1] - offset[1]
+        else:
+            yoffset = self._j_none
+        
+        return (xoffset, yoffset)
+        
+    @property
+    def statements(self):
+        return self.header + self.body + self.end
+        
+    def set_bounds(self, bounds):
+        pass
+    
+    def _paint_background(self):
+        pass
+    
+    def _select_aperture(self, aperture):
+        
+        # Select the right aperture if not already selected
+        if aperture:
+            if isinstance(aperture, Circle):
+                aper = self._get_circle(aperture.diameter)
+            elif isinstance(aperture, Rectangle):
+                aper = self._get_rectangle(aperture.width, aperture.height)
+            else:
+                raise NotImplementedError('Line with invalid aperture type')
+                
+            if aper.d != self._dcode:
+                self.body.append(ApertureStmt(aper.d))
+                self._dcode = aper.d
+        
+    def _render_line(self, line, color):
+        
+        self._select_aperture(line.aperture)
+            
+        # Get the right function
+        if self._func != CoordStmt.FUNC_LINEAR:
+            func = CoordStmt.FUNC_LINEAR
+        else:
+            func = None
+        self._func = CoordStmt.FUNC_LINEAR
+        
+        if self._pos != line.start:
+            self.body.append(CoordStmt.move(func, self._simplify_point(line.start)))
+            self._pos = line.start
+            # We already set the function, so the next command doesn't require that
+            func = None
+        
+        self.body.append(CoordStmt.line(func, self._simplify_point(line.end)))
+        self._pos = line.end
+        
+    def _render_arc(self, arc, color):
+        
+        # Optionally set the quadrant mode if it has changed:
+        if arc.quadrant_mode != self._quadrant_mode:
+            
+            if arc.quadrant_mode != 'multi-quadrant':
+                self.body.append(QuadrantModeStmt.single())
+            else:
+                self.body.append(QuadrantModeStmt.multi())
+            
+            self._quadrant_mode = arc.quadrant_mode
+            
+        # Select the right aperture if not already selected
+        self._select_aperture(arc.aperture)
+        
+        # Find the right movement mode. Always set to be sure it is really right
+        dir = arc.direction
+        if dir == 'clockwise':
+            func = CoordStmt.FUNC_ARC_CW
+            self._func = CoordStmt.FUNC_ARC_CW
+        elif dir == 'counterclockwise':
+            func = CoordStmt.FUNC_ARC_CCW
+            self._func = CoordStmt.FUNC_ARC_CCW
+        else:
+            raise ValueError('Invalid circular interpolation mode')
+            
+        if self._pos != arc.start:
+            # TODO I'm not sure if this is right
+            self.body.append(CoordStmt.move(CoordStmt.FUNC_LINEAR, self._simplify_point(arc.start)))
+            self._pos = arc.start
+            
+        center = self._simplify_offset(arc.center, arc.start)
+        end = self._simplify_point(arc.end)
+        self.body.append(CoordStmt.arc(func, end, center))
+        self._pos = arc.end
+
+    def _render_region(self, region, color):
+        
+        self._render_level_polarity(region)
+        
+        self.body.append(RegionModeStmt.on())
+        
+        for p in region.primitives:
+            
+            if isinstance(p, Line):
+                self._render_line(p, color)
+            else:
+                self._render_arc(p, color)
+                
+
+        self.body.append(RegionModeStmt.off())
+        
+    def _render_level_polarity(self, region):
+        if region.level_polarity != self._level_polarity:
+            self._level_polarity = region.level_polarity
+            self.body.append(LPParamStmt.from_region(region))
+            
+    def _render_flash(self, primitive, aperture):
+        
+        if aperture.d != self._dcode:
+            self.body.append(ApertureStmt(aperture.d))
+            self._dcode = aperture.d
+        
+        self.body.append(CoordStmt.flash( self._simplify_point(primitive.position)))
+        self._pos = primitive.position
+            
+    def _get_circle(self, diameter, dcode = None):
+        '''Define a circlar aperture'''
+        
+        aper = self._circles.get(diameter, None)
+
+        if not aper:
+            if not dcode:
+                dcode = self._next_dcode
+                self._next_dcode += 1
+            else:
+                self._next_dcode = max(dcode + 1, self._next_dcode)
+                
+            aper = ADParamStmt.circle(dcode, diameter)
+            self._circles[diameter] = aper
+            self.header.append(aper)
+
+        return aper
+        
+    def _render_circle(self, circle, color):
+
+        aper = self._get_circle(circle.diameter)
+        self._render_flash(circle, aper)
+
+    def _get_rectangle(self, width, height, dcode = None):
+        '''Get a rectanglar aperture. If it isn't defined, create it'''
+        
+        key = (width, height)
+        aper = self._rects.get(key, None)
+        
+        if not aper:
+            if not dcode:
+                dcode = self._next_dcode
+                self._next_dcode += 1
+            else:
+                self._next_dcode = max(dcode + 1, self._next_dcode)
+            
+            aper = ADParamStmt.rect(dcode, width, height)
+            self._rects[(width, height)] = aper
+            self.header.append(aper)
+    
+        return aper
+
+    def _render_rectangle(self, rectangle, color):
+        
+        aper = self._get_rectangle(rectangle.width, rectangle.height)
+        self._render_flash(rectangle, aper)
+        
+    def _render_obround(self, obround, color):
+        pass
+        
+    def _render_polygon(self, polygon, color):
+        pass
+        
+    def _render_drill(self, circle, color):
+        pass
+    
+    def _hash_amacro(self, amgroup):
+        '''Calculate a very quick hash code for deciding if we should even check AM groups for comparision'''
+        
+        hash = ''
+        for primitive in amgroup.primitives:
+            
+            hash += primitive.__class__.__name__[0]
+            if hasattr(primitive, 'primitives'):
+                hash += str(len(primitive.primitives))
+            
+        return hash
+    
+    def _get_amacro(self, amgroup, dcode = None):
+        # Macros are a little special since we don't have a good way to compare them quickly
+        # but in most cases, this should work
+        
+        hash = self._hash_amacro(amgroup)
+        macro = self._macros.get(hash, None)
+        
+        if not macro:
+            # This is a new macro, so define it
+            if not dcode:
+                dcode = self._next_dcode
+                self._next_dcode += 1
+            else:
+                self._next_dcode = max(dcode + 1, self._next_dcode)
+            
+            # Create the statements
+            # TODO
+            statements = []
+            aperdef = ADParamStmt.macro(dcode, hash)
+            
+            # Store the dcode and the original so we can check if it really is the same
+            macro = (aperdef, amgroup)
+            self._macros[hash] = macro
+        
+        else:
+            # We hae a definition, but check that the groups actually are the same
+            offset = (amgroup.position[0] - macro[1].position[0], amgroup.position[1] - macro[1].position[1])
+            if not amgroup.equivalent(macro[1], offset):
+                raise ValueError('Two AMGroup have the same hash but are not equivalent')
+            
+        return macro[0]
+        
+    def _render_amgroup(self, amgroup, color):
+        
+        aper = self._get_amacro(amgroup)
+        self._render_flash(amgroup, aper)
+        
+    def _render_inverted_layer(self):
+        pass
+        
+    def post_render_primitives(self):
+        '''No more primitives, so set the end marker'''
+        
+        self.body.append()
\ No newline at end of file
diff --git a/gerber/utils.py b/gerber/utils.py
index 1c0af52..16323d6 100644
--- a/gerber/utils.py
+++ b/gerber/utils.py
@@ -288,3 +288,9 @@ def rotate_point(point, angle, center=(0.0, 0.0)):
     x = center[0] + (cos(angle) * xdelta) - (sin(angle) * ydelta)
     y = center[1] + (sin(angle) * xdelta) - (cos(angle) * ydelta)
     return (x, y)
+
+
+def nearly_equal(point1, point2, ndigits = 6):
+    '''Are the points nearly equal'''
+    
+    return round(point1[0] - point2[0], ndigits) == 0 and round(point1[1] - point2[1], ndigits) == 0