summaryrefslogtreecommitdiff
path: root/gerber/render/cairo_backend.py
blob: c1df87a47aa4b6469e33205d752692e1aff883d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
#! /usr/bin/env python
# -*- coding: utf-8 -*-

# Copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from .render import GerberContext
from operator import mul
import cairocffi as cairo
import math

from ..primitives import *

SCALE = 400.


class GerberCairoContext(GerberContext):
    def __init__(self, surface=None, size=(1000, 1000)):
        GerberContext.__init__(self)
        if surface is None:
            self.surface = cairo.ImageSurface(cairo.FORMAT_ARGB32,
                                              size[0], size[1])
        else:
            self.surface = surface
        self.ctx = cairo.Context(self.surface)
        self.size = size
        self.ctx.translate(0, self.size[1])
        self.scale = (SCALE,SCALE)
        self.ctx.scale(1, -1)
        self.apertures = {}
        self.background = False

    def set_bounds(self, bounds):
        xbounds, ybounds = bounds
        self.ctx.rectangle(SCALE * xbounds[0], SCALE * ybounds[0], SCALE * (xbounds[1]- xbounds[0]), SCALE * (ybounds[1] - ybounds[0]))
        self.ctx.set_source_rgb(0,0,0)
        self.ctx.fill()

    def _render_line(self, line, color):
        start = map(mul, line.start, self.scale)
        end = map(mul, line.end, self.scale)
        if isinstance(line.aperture, Circle):
            width = line.aperture.diameter if line.aperture.diameter != 0 else 0.001
            self.ctx.set_source_rgba(*color, alpha=self.alpha)
            self.ctx.set_line_width(width * SCALE)
            self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)
            self.ctx.move_to(*start)
            self.ctx.line_to(*end)
            self.ctx.stroke()
        elif isinstance(line.aperture, rectangle):
            # TODO: Render rectangle strokes as a polygon...
            pass

    def _render_arc(self, arc, color):
        center = map(mul, arc.center, self.scale)
        start = map(mul, arc.start, self.scale)
        end = map(mul, arc.end, self.scale)
        radius = SCALE * arc.radius
        angle1 = arc.start_angle
        angle2 = arc.end_angle
        width = arc.width if arc.width != 0 else 0.001
        self.ctx.set_source_rgba(*color, alpha=self.alpha)
        self.ctx.set_line_width(width * SCALE)
        self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)
        self.ctx.move_to(*start)  # You actually have to do this...
        if arc.direction == 'counterclockwise':
            self.ctx.arc(*center, radius=radius, angle1=angle1, angle2=angle2)
        else:
            self.ctx.arc_negative(*center, radius=radius, angle1=angle1, angle2=angle2)
        self.ctx.move_to(*end)  # ...lame

    def _render_region(self, region, color):
        points = [tuple(map(mul, point, self.scale)) for point in region.points]
        self.ctx.set_source_rgba(*color, alpha=self.alpha)
        self.ctx.set_line_width(0)
        self.ctx.move_to(*points[0])
        for point in points[1:]:
            self.ctx.line_to(*point)
        self.ctx.fill()

    def _render_circle(self, circle, color):
        center = map(mul, circle.position, self.scale)
        self.ctx.set_source_rgba(*color, alpha=self.alpha)
        self.ctx.set_line_width(0)
        self.ctx.arc(*center, radius=circle.radius * SCALE, angle1=0, angle2=2 * math.pi)
        self.ctx.fill()

    def _render_rectangle(self, rectangle, color):
        ll = map(mul, rectangle.lower_left, self.scale)
        width, height = tuple(map(mul, (rectangle.width, rectangle.height), map(abs, self.scale)))
        self.ctx.set_source_rgba(*color, alpha=self.alpha)
        self.ctx.set_line_width(0)
        self.ctx.rectangle(*ll,width=width, height=height)
        self.ctx.fill()

    def _render_obround(self, obround, color):
        self._render_circle(obround.subshapes['circle1'], color)
        self._render_circle(obround.subshapes['circle2'], color)
        self._render_rectangle(obround.subshapes['rectangle'], color)

    def _render_drill(self, circle, color):
        self._render_circle(circle, color)

    def dump(self, filename):
        self.surface.write_to_png(filename)