Merge pull request #53 from curtacircuitos/pcb_interface

Add PCB interface

1 files changed, 81 insertions, 43 deletions

diff --git a/gerber/render/cairo_backend.py b/gerber/render/cairo_backend.py
index 8283ae0..4e71e75 100644
--- a/gerber/render/cairo_backend.py
+++ b/gerber/render/cairo_backend.py
@@ -21,7 +21,8 @@ from operator import mul
 import math

 import tempfile

 

-from .render import GerberContext

+from .render import GerberContext, RenderSettings

+from .theme import THEMES

 from ..primitives import *

 

 try:

@@ -39,16 +40,25 @@ class GerberCairoContext(GerberContext):
         self.bg = False

         self.mask = None

         self.mask_ctx = None

-        self.origin_in_pixels = None

-        self.size_in_pixels = None

+        self.origin_in_inch = None

+        self.size_in_inch = None

+        self._xform_matrix = None

 

-    def set_bounds(self, bounds):

+    @property

+    def origin_in_pixels(self):

+        return tuple(map(mul, self.origin_in_inch, self.scale)) if self.origin_in_inch is not None else (0.0, 0.0)

+

+    @property

+    def size_in_pixels(self):

+        return tuple(map(mul, self.size_in_inch, self.scale)) if self.size_in_inch is not None else (0.0, 0.0)

+

+    def set_bounds(self, bounds, new_surface=False):

         origin_in_inch = (bounds[0][0], bounds[1][0])

         size_in_inch = (abs(bounds[0][1] - bounds[0][0]), abs(bounds[1][1] - bounds[1][0]))

-        size_in_pixels = map(mul, size_in_inch, self.scale)

-        self.origin_in_pixels = tuple(map(mul, origin_in_inch, self.scale)) if self.origin_in_pixels is None else self.origin_in_pixels

-        self.size_in_pixels = size_in_pixels if self.size_in_pixels is None else self.size_in_pixels

-        if self.surface is None:

+        size_in_pixels = tuple(map(mul, size_in_inch, self.scale))

+        self.origin_in_inch = origin_in_inch if self.origin_in_inch is None else self.origin_in_inch

+        self.size_in_inch = size_in_inch if self.size_in_inch is None else self.size_in_inch

+        if (self.surface is None) or new_surface:

             self.surface_buffer = tempfile.NamedTemporaryFile()

             self.surface = cairo.SVGSurface(self.surface_buffer, size_in_pixels[0], size_in_pixels[1])

             self.ctx = cairo.Context(self.surface)

@@ -60,6 +70,58 @@ class GerberCairoContext(GerberContext):
             self.mask_ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)

             self.mask_ctx.scale(1, -1)

             self.mask_ctx.translate(-(origin_in_inch[0] * self.scale[0]), (-origin_in_inch[1]*self.scale[0]) - size_in_pixels[1])

+        self._xform_matrix = cairo.Matrix(xx=1.0, yy=-1.0, x0=-self.origin_in_pixels[0], y0=self.size_in_pixels[1] + self.origin_in_pixels[1])

+

+    def render_layers(self, layers, filename, theme=THEMES['default']):

+        """ Render a set of layers

+        """

+        self.set_bounds(layers[0].bounds, True)

+        self._paint_background(True)

+        for layer in layers:

+            self._render_layer(layer, theme)

+        self.dump(filename)

+

+    def dump(self, filename):

+        """ Save image as `filename`

+        """

+        is_svg = filename.lower().endswith(".svg")

+        if is_svg:

+            self.surface.finish()

+            self.surface_buffer.flush()

+            with open(filename, "w") as f:

+                self.surface_buffer.seek(0)

+                f.write(self.surface_buffer.read())

+                f.flush()

+        else:

+            self.surface.write_to_png(filename)

+

+    def dump_str(self):

+        """ Return a string containing the rendered image.

+        """

+        fobj = StringIO()

+        self.surface.write_to_png(fobj)

+        return fobj.getvalue()

+

+    def dump_svg_str(self):

+        """ Return a string containg the rendered SVG.

+        """

+        self.surface.finish()

+        self.surface_buffer.flush()

+        return self.surface_buffer.read()

+

+    def _render_layer(self, layer, theme=THEMES['default']):

+        settings = theme.get(layer.layer_class, RenderSettings())

+        self.color = settings.color

+        self.alpha = settings.alpha

+        self.invert = settings.invert

+        if settings.mirror:

+            raise Warning('mirrored layers aren\'t supported yet...')

+        if self.invert:

+            self._clear_mask()

+        for prim in layer.primitives:

+            self.render(prim)

+        if self.invert:

+            self._render_mask()

 

     def _render_line(self, line, color):

         start = map(mul, line.start, self.scale)

@@ -178,12 +240,14 @@ class GerberCairoContext(GerberContext):
         self._render_circle(circle, color)

 

     def _render_test_record(self, primitive, color):

-        self.ctx.select_font_face('monospace', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)

-        self.ctx.set_font_size(200)

-        self._render_circle(Circle(primitive.position, 0.01), color)

-        self.ctx.set_source_rgb(*color)

+        position = tuple(map(add, primitive.position, self.origin_in_inch))

+        self.ctx.set_operator(cairo.OPERATOR_OVER)

+        self.ctx.select_font_face('monospace', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_BOLD)

+        self.ctx.set_font_size(13)

+        self._render_circle(Circle(position, 0.015), color)

+        self.ctx.set_source_rgba(*color, alpha=self.alpha)

         self.ctx.set_operator(cairo.OPERATOR_OVER if primitive.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

-        self.ctx.move_to(*[self.scale[0] * (coord + 0.01) for coord in primitive.position])

+        self.ctx.move_to(*[self.scale[0] * (coord + 0.015) for coord in position])

         self.ctx.scale(1, -1)

         self.ctx.show_text(primitive.net_name)

         self.ctx.scale(1, -1)

@@ -196,38 +260,12 @@ class GerberCairoContext(GerberContext):
     def _render_mask(self):

         self.ctx.set_operator(cairo.OPERATOR_OVER)

         ptn = cairo.SurfacePattern(self.mask)

-        ptn.set_matrix(cairo.Matrix(xx=1.0, yy=-1.0, x0=-self.origin_in_pixels[0], y0=self.size_in_pixels[1] + self.origin_in_pixels[1]))

+        ptn.set_matrix(self._xform_matrix)

         self.ctx.set_source(ptn)

         self.ctx.paint()

 

-    def _paint_background(self):

-        if not self.bg:

+    def _paint_background(self, force=False):

+        if (not self.bg) or force:

             self.bg = True

-            self.ctx.set_source_rgba(*self.background_color)

+            self.ctx.set_source_rgba(*self.background_color, alpha=1.0)

             self.ctx.paint()

-

-    def dump(self, filename):

-        is_svg = filename.lower().endswith(".svg")

-        if is_svg:

-            self.surface.finish()

-            self.surface_buffer.flush()

-            with open(filename, "w") as f:

-                self.surface_buffer.seek(0)

-                f.write(self.surface_buffer.read())

-                f.flush()

-        else:

-            self.surface.write_to_png(filename)

-

-    def dump_str(self):

-        """ Return a string containing the rendered image.

-        """

-        fobj = StringIO()

-        self.surface.write_to_png(fobj)

-        return fobj.getvalue()

-

-    def dump_svg_str(self):

-        """ Return a string containg the rendered SVG.

-        """

-        self.surface.finish()

-        self.surface_buffer.flush()

-        return self.surface_buffer.read()