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# coding=utf-8
#
# Copyright (C) 2011 Karlisson Bezerra <contact@hacktoon.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
"""
Convas module for ink2canvas extension
"""
from inkex import Color
class Canvas(object):
"""Canvas API helper class"""
def __init__(self, parent, width, height, context="ctx"):
self.obj = context
self.code = [] # stores the code
self.style = {}
self.styleCache = {} # stores the previous style applied
self.parent = parent
self.width = width
self.height = height
def write(self, text):
self.code.append("\t" + text.replace("ctx", self.obj) + "\n")
def output(self):
from textwrap import dedent
html = """
<!DOCTYPE html>
<html>
<head>
<title>Inkscape Output</title>
</head>
<body>
<canvas id='canvas' width='%d' height='%d'></canvas>
<script>
var %s = document.getElementById("canvas").getContext("2d");
%s
</script>
</body>
</html>
"""
return dedent(html) % (self.width, self.height, self.obj, "".join(self.code))
def equalStyle(self, style, key):
"""Checks if the last style used is the same or there's no style yet"""
if key in self.styleCache:
return True
if key not in style:
return True
return style[key] == self.styleCache[key]
def beginPath(self):
self.write("ctx.beginPath();")
def createLinearGradient(self, href, x1, y1, x2, y2):
data = (href, x1, y1, x2, y2)
self.write("var %s = \
ctx.createLinearGradient(%f,%f,%f,%f);" % data)
def createRadialGradient(self, href, cx1, cy1, rx, cx2, cy2, ry):
data = (href, cx1, cy1, rx, cx2, cy2, ry)
self.write("var %s = ctx.createRadialGradient\
(%f,%f,%f,%f,%f,%f);" % data)
def addColorStop(self, href, pos, color):
self.write("%s.addColorStop(%f, %s);" % (href, pos, color))
def getColor(self, rgb, alpha):
return "'{}'".format(str(Color(rgb).to_rgba(alpha)))
def setGradient(self, href):
"""
for stop in gstops:
style = simplestyle.parseStyle(stop.get("style"))
stop_color = style["stop-color"]
opacity = style["stop-opacity"]
color = self.getColor(stop_color, opacity)
pos = float(stop.get("offset"))
self.addColorStop(href, pos, color)
"""
return None # href
def setOpacity(self, value):
self.write("ctx.globalAlpha = %.1f;" % float(value))
def setFill(self, value):
try:
alpha = self.style["fill-opacity"]
except:
alpha = 1
if not value.startswith("url("):
fill = self.getColor(value, alpha)
self.write("ctx.fillStyle = %s;" % fill)
def setStroke(self, value):
try:
alpha = self.style["stroke-opacity"]
except:
alpha = 1
self.write("ctx.strokeStyle = %s;" % self.getColor(value, alpha))
def setStrokeWidth(self, value):
self.write("ctx.lineWidth = %f;" % self.parent.svg.unittouu(value))
def setStrokeLinecap(self, value):
self.write("ctx.lineCap = '%s';" % value)
def setStrokeLinejoin(self, value):
self.write("ctx.lineJoin = '%s';" % value)
def setStrokeMiterlimit(self, value):
self.write("ctx.miterLimit = %s;" % value)
def setFont(self, value):
self.write("ctx.font = \"%s\";" % value)
def moveTo(self, x, y):
self.write("ctx.moveTo(%f, %f);" % (x, y))
def lineTo(self, x, y):
self.write("ctx.lineTo(%f, %f);" % (x, y))
def quadraticCurveTo(self, cpx, cpy, x, y):
data = (cpx, cpy, x, y)
self.write("ctx.quadraticCurveTo(%f, %f, %f, %f);" % data)
def bezierCurveTo(self, x1, y1, x2, y2, x, y):
data = (x1, y1, x2, y2, x, y)
self.write("ctx.bezierCurveTo(%f, %f, %f, %f, %f, %f);" % data)
def rect(self, x, y, w, h, rx=0, ry=0):
if rx or ry:
# rounded rectangle, starts top-left anticlockwise
self.moveTo(x, y + ry)
self.lineTo(x, y + h - ry)
self.quadraticCurveTo(x, y + h, x + rx, y + h)
self.lineTo(x + w - rx, y + h)
self.quadraticCurveTo(x + w, y + h, x + w, y + h - ry)
self.lineTo(x + w, y + ry)
self.quadraticCurveTo(x + w, y, x + w - rx, y)
self.lineTo(x + rx, y)
self.quadraticCurveTo(x, y, x, y + ry)
else:
self.write("ctx.rect(%f, %f, %f, %f);" % (x, y, w, h))
def arc(self, x, y, r, a1, a2, flag):
data = (x, y, r, a1, a2, flag)
self.write("ctx.arc(%f, %f, %f, %f, %.8f, %d);" % data)
def fillText(self, text, x, y):
self.write("ctx.fillText(\"%s\", %f, %f);" % (text, x, y))
def translate(self, cx, cy):
self.write("ctx.translate(%f, %f);" % (cx, cy))
def rotate(self, angle):
self.write("ctx.rotate(%f);" % angle)
def scale(self, rx, ry):
self.write("ctx.scale(%f, %f);" % (rx, ry))
def transform(self, m11, m12, m21, m22, dx, dy):
data = (m11, m12, m21, m22, dx, dy)
self.write("ctx.transform(%f, %f, %f, %f, %f, %f);" % data)
def save(self):
self.write("ctx.save();")
def restore(self):
self.write("ctx.restore();")
def closePath(self):
if "fill" in self.style and self.style["fill"] != "none":
self.write("ctx.fill();")
if "stroke" in self.style and self.style["stroke"] != "none":
self.write("ctx.stroke();")
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