#Copyright ReportLab Europe Ltd. 2000-2017
#see license.txt for license details
#history www.reportlab.co.uk/rl-cgi/viewcvs.cgi/rlextra/graphics/Csrc/renderPM/renderP.py
__version__='3.3.0'
__doc__="""Render drawing objects in common bitmap formats

Usage::

    from reportlab.graphics import renderPM
    renderPM.drawToFile(drawing,filename,fmt='GIF',configPIL={....})

Other functions let you create a PM drawing as string or into a PM buffer.
Execute the script to see some test drawings."""

from reportlab.graphics.shapes import *
from reportlab.graphics.renderbase import getStateDelta, renderScaledDrawing
from reportlab.pdfbase.pdfmetrics import getFont, unicode2T1, stringWidth
from reportlab.pdfbase.ttfonts import ShapedStr, shapeFragWord
from reportlab.pdfgen.textobject import bidiShapedText
from reportlab.lib.utils import isUnicode, asUnicode
from reportlab.lib.abag import ABag
from reportlab.lib.colors import toColor, white
from reportlab import rl_config
from .utils import setFont as _setFont, RenderPMError

import os, sys
from io import BytesIO, StringIO
from math import sin, cos, pi, ceil

def _getPMBackend(backend=None):
    if not backend: backend = rl_config.renderPMBackend
    if backend=='_renderPM':
        try:
            import _rl_renderPM as M
        except ImportError as errMsg:
            try:
                import rlPyCairo as M
            except ImportError:
                raise RenderPMError("""Cannot import desired renderPM backend, {backend}.
No module named _rl_renderPM
it may be badly or not installed!
You may need to install development tools
or seek advice at the users list see
https://pairlist2.pair.net/mailman/listinfo/reportlab-users""")
    elif 'cairo' in backend.lower():
        try:
            import rlPyCairo as M
        except ImportError as errMsg:
            try:
                import _rl_renderPM as M
            except ImportError:
                raise RenderPMError(f"""cannot import desired renderPM backend {backend}
Seek advice at the users list see
https://pairlist2.pair.net/mailman/listinfo/reportlab-users""")
    else:
        raise RenderPMError(f'Invalid renderPM backend, {backend}')
    return M

try:
    _pmBackend = _getPMBackend(rl_config.renderPMBackend)
except RenderPMError:
    _pmBackend=None

def _getImage():
    try:
        from PIL import Image
    except ImportError:
        import Image
    return Image

def Color2Hex(c):
    #assert isinstance(colorobj, colors.Color) #these checks don't work well RGB
    if c: return ((0xFF&int(255*c.red)) << 16) | ((0xFF&int(255*c.green)) << 8) | (0xFF&int(255*c.blue))
    return c

def CairoColor(c):
    '''
    c should be None or something convertible to Color
    rlPyCairo.GState can handle Color directly in either RGB24 or ARGB32
    '''
    return toColor(c) if c is not None else c

# the main entry point for users...
def draw(drawing, canvas, x, y, showBoundary=rl_config._unset_,**kwds):
    """As it says"""
    R = _PMRenderer()
    R.__dict__.update(kwds)
    R.draw(renderScaledDrawing(drawing), canvas, x, y, showBoundary=showBoundary)

from reportlab.graphics.renderbase import Renderer
class _PMRenderer(Renderer):
    """This draws onto a pix map image. It needs to be a class
    rather than a function, as some image-specific state tracking is
    needed outside of the state info in the SVG model."""

    def pop(self):
        self._tracker.pop()
        self.applyState()

    def push(self,node):
        deltas = getStateDelta(node)
        self._tracker.push(deltas)
        self.applyState()

    def applyState(self):
        s = self._tracker.getState()
        self._canvas.ctm = s['ctm']
        self._canvas.strokeWidth = s['strokeWidth']
        alpha = s['strokeOpacity']
        if alpha is not None:
            self._canvas.strokeOpacity = alpha
        self._canvas.setStrokeColor(s['strokeColor'])
        self._canvas.lineCap = s['strokeLineCap']
        self._canvas.lineJoin = s['strokeLineJoin']
        self._canvas.fillMode = s['fillMode']
        da = s['strokeDashArray']
        if not da:
            da = None
        else:
            if not isinstance(da,(list,tuple)):
                da = da,
            if len(da)!=2 or not isinstance(da[1],(list,tuple)):
                da = 0, da  #assume phase of 0
        self._canvas.dashArray = da
        alpha = s['fillOpacity']
        if alpha is not None:
            self._canvas.fillOpacity = alpha
        self._canvas.setFillColor(s['fillColor'])
        self._canvas.setFont(s['fontName'], s['fontSize'])

    def initState(self,x,y):
        deltas = self._tracker._combined[-1]
        deltas['transform'] = deltas['ctm'] = self._canvas._baseCTM[0:4]+(x,y)
        self._tracker.push(deltas)
        self.applyState()

    def drawNode(self, node):
        """This is the recursive method called for each node
        in the tree"""

        #apply state changes
        self.push(node)

        #draw the object, or recurse
        self.drawNodeDispatcher(node)

        # restore the state
        self.pop()

    def drawRect(self, rect):
        c = self._canvas
        if rect.rx == rect.ry == 0:
            #plain old rectangle, draw clockwise (x-axis to y-axis) direction
            c.rect(rect.x,rect.y, rect.width, rect.height)
        else:
            c.roundRect(rect.x,rect.y, rect.width, rect.height, rect.rx, rect.ry)

    def drawLine(self, line):
        self._canvas.line(line.x1,line.y1,line.x2,line.y2)

    def drawImage(self, image):
        path = image.path
        if isinstance(path,str):
            if not (path and os.path.isfile(path)): return
            im = _getImage().open(path).convert('RGB')
        elif hasattr(path,'convert'):
            im = path.convert('RGB')
        else:
            return
        srcW, srcH = im.size
        dstW, dstH = image.width, image.height
        if dstW is None: dstW = srcW
        if dstH is None: dstH = srcH
        self._canvas._aapixbuf(
                image.x, image.y, dstW, dstH,
                (im if self._canvas._backend=='rlPyCairo' #rlPyCairo has a from_pil method
                    else (im.tobytes if hasattr(im,'tobytes') else im.tostring)()),
                srcW, srcH, 3,
                )

    def drawCircle(self, circle):
        c = self._canvas
        c.circle(circle.cx,circle.cy, circle.r)
        c.fillstrokepath()

    def drawPolyLine(self, polyline, _doClose=0):
        P = polyline.points
        assert len(P) >= 2, 'Polyline must have 1 or more points'
        c = self._canvas
        c.pathBegin()
        c.moveTo(P[0], P[1])
        for i in range(2, len(P), 2):
            c.lineTo(P[i], P[i+1])
        if _doClose:
            c.pathClose()
            c.pathFill()
        c.pathStroke()

    def drawEllipse(self, ellipse):
        c=self._canvas
        c.ellipse(ellipse.cx, ellipse.cy, ellipse.rx,ellipse.ry)
        c.fillstrokepath()

    def drawPolygon(self, polygon):
        self.drawPolyLine(polygon,_doClose=1)

    def drawString(self, stringObj):
        canv = self._canvas
        fill = canv.fillColor
        textRenderMode = getattr(stringObj,'textRenderMode',0)
        if fill is not None or textRenderMode:
            S = self._tracker.getState()
            text_anchor = S['textAnchor']
            fontName = S['fontName']
            fontSize = S['fontSize']
            text = stringObj.text
            x = stringObj.x
            y = stringObj.y
            if not text_anchor in ['start','inherited']:
                textLen = stringWidth(text, fontName,fontSize)
                if text_anchor=='end':
                    x -= textLen
                elif text_anchor=='middle':
                    x -= textLen/2
                elif text_anchor=='numeric':
                    x -= numericXShift(text_anchor,text,textLen,fontName,fontSize,stringObj.encoding)
                else:
                    raise ValueError('bad value for textAnchor '+str(text_anchor))
            oldTextRenderMode = canv.textRenderMode
            canv.textRenderMode = textRenderMode
            try:
                canv.drawString(x,y,text,_fontInfo=(fontName,fontSize))
            finally:
                canv.textRenderMode = oldTextRenderMode

    def drawPath(self, path):
        c = self._canvas
        if path is EmptyClipPath:
            del c._clipPaths[-1]
            if c._clipPaths:
                P = c._clipPaths[-1]
                icp = P.isClipPath
                P.isClipPath = 1
                self.drawPath(P)
                P.isClipPath = icp
            else:
                c.clipPathClear()
            return
        from reportlab.graphics.shapes import _renderPath
        drawFuncs = (c.moveTo, c.lineTo, c.curveTo, c.pathClose)
        autoclose = getattr(path,'autoclose','')
        def rP(forceClose=False):
            c.pathBegin()
            return _renderPath(path, drawFuncs, forceClose=forceClose)
        if path.isClipPath:
            rP()
            c.clipPathSet()
            c._clipPaths.append(path)
        fill = c.fillColor is not None
        stroke = c.strokeColor is not None
        fillMode = getattr(path,'fillMode',-1)
        if autoclose=='svg':
            if fill and stroke:
                rP(forceClose=True)
                c.pathFill(fillMode)
                rP()
                c.pathStroke()
            elif fill:
                rP(forceClose=True)
                c.pathFill(fillMode)
            elif stroke:
                rP()
                c.pathStroke()
        elif autoclose=='pdf':
            rP(forceClose=True)
            if fill:
                c.pathFill(fillMode)
            if stroke:
                c.pathStroke()
        else:
            if rP():
                c.pathFill(fillMode)
            c.pathStroke()

def _convert2pilp(im):
    Image = _getImage()
    return im.convert("P", dither=Image.NONE, palette=Image.ADAPTIVE)

def _convert2pilL(im):
    return im.convert("L")

def _convert2pil1(im):
    return im.convert("1")

def _saveAsPICT(im,fn,fmt,transparent=None):
    im = _convert2pilp(im)
    cols, rows = im.size
    s = _pmBackend.pil2pict(cols,rows,(im.tobytes if hasattr(im,'tobytes') else im.tostring)(),im.im.getpalette())
    if not hasattr(fn,'write'):
        with open(os.path.splitext(fn)[0]+'.'+fmt.lower(),'wb') as f:
            f.write(s)
        if os.name=='mac':
            from reportlab.lib.utils import markfilename
            markfilename(fn,ext='PICT')
    else:
        fn.write(s)

_pycairoFmtsMap = dict(ARGB='ARGB32',RGBA='ARGB32',RGB='RGB24')
BEZIER_ARC_MAGIC = 0.5522847498     #constant for drawing circular arcs w/ Beziers
class PMCanvas:
    def __init__(self,w,h,dpi=72,bg=0xffffff,configPIL=None,backend=None,
                    backendFmt='RGB'):
        '''configPIL dict is passed to image save method'''
        scale = dpi/72.0
        w = int(w*scale+0.5)
        h = int(h*scale+0.5)
        self.__dict__['_gs'] = self._getGState(w,h,bg,backend,fmt=backendFmt)
        self.__dict__['_bg'] = bg
        self.__dict__['_baseCTM'] = (scale,0,0,scale,0,0)
        self.__dict__['_clipPaths'] = []
        self.__dict__['configPIL'] = configPIL
        self.__dict__['_dpi'] = dpi
        #the _rl_renderPM.gstate object doesn't support hasattr so we use this as a proxy test for 'isbuiltin' 
        self.__dict__['_backend'] = '_renderPM' if type(self._gs._aapixbuf)==type(pow) else 'rlPyCairo'
        self.__dict__['_backendfmt'] = backendFmt
        self.__dict__['_colorConverter'] = CairoColor if self._backend=='rlPyCairo' else Color2Hex
        self.ctm = self._baseCTM

    @staticmethod
    def _getGState(w, h, bg, backend=None, fmt='RGB24'):
        mod = _getPMBackend(backend)
        if backend is None:
            backend = rl_config.renderPMBackend
        if backend=='_renderPM':
            try:
                return mod.gstate(w,h,bg=bg)
            except TypeError:
                try:
                    return mod.GState(w,h,bg,fmt=fmt)
                except:
                    pass
        elif 'cairo' in backend.lower():
            fmt = fmt.upper()
            fmt = _pycairoFmtsMap.get(fmt,fmt)
            try:
                return mod.GState(w,h,bg,fmt=fmt)
            except AttributeError:
                return mod.gstate(w,h,bg=bg)
        raise RuntimeError(f'Cannot obtain PM graphics state using backend {backend!r}')

    def _drawTimeResize(self,w,h,bg=None):
        if bg is None: bg = self._bg
        self._drawing.width, self._drawing.height = w, h
        A = {'ctm':None, 'strokeWidth':None, 'strokeColor':None, 'lineCap':None, 'lineJoin':None, 'dashArray':None, 'fillColor':None}
        gs = self._gs
        fN,fS = gs.fontName, gs.fontSize
        for k in A.keys():
            A[k] = getattr(gs,k)
        del gs, self._gs
        gs = self.__dict__['_gs'] = _pmBackend.gstate(w,h,bg=bg)
        for k in A.keys():
            setattr(self,k,A[k])
        gs.setFont(fN,fS)

    def toPIL(self):
        im = _getImage().new('RGBA' if self._backend=='rlPyCairo' and getattr(self,'_fmt')=='ARGB32' else 'RGB', size=(self._gs.width, self._gs.height))
        im.frombytes(self._gs.pixBuf)
        return im

    def saveToFile(self,fn,fmt=None):
        im = self.toPIL()
        if fmt is None:
            if not isinstance(fn,str):
                raise ValueError("Invalid value '%s' for fn when fmt is None" % ascii(fn))
            fmt = os.path.splitext(fn)[1]
            if fmt.startswith('.'): fmt = fmt[1:]
        configPIL = self.configPIL or {}
        configPIL.setdefault('preConvertCB',None)
        preConvertCB=configPIL.pop('preConvertCB')
        if preConvertCB:
            im = preConvertCB(im)
        fmt = fmt.upper()
        if fmt in ('GIF',):
            im = _convert2pilp(im)
        elif fmt in ('TIFF','TIFFP','TIFFL','TIF','TIFF1'):
            if fmt.endswith('P'):
                im = _convert2pilp(im)
            elif fmt.endswith('L'):
                im = _convert2pilL(im)
            elif fmt.endswith('1'):
                im = _convert2pil1(im)
            fmt='TIFF'
        elif fmt in ('PCT','PICT'):
            return _saveAsPICT(im,fn,fmt,transparent=configPIL.get('transparent',None))
        elif fmt in ('PNG','BMP', 'PPM'):
            pass
        elif fmt in ('JPG','JPEG'):
            fmt = 'JPEG'
        else:
            raise RenderPMError("Unknown image kind %s" % fmt)
        if fmt=='TIFF':
            tc = configPIL.get('transparent',None)
            if tc:
                from PIL import ImageChops, Image
                T = 768*[0]
                for o, c in zip((0,256,512), tc.bitmap_rgb()):
                    T[o+c] = 255
                #if isinstance(fn,str): ImageChops.invert(im.point(T).convert('L').point(255*[0]+[255])).save(fn+'_mask.gif','GIF')
                im = Image.merge('RGBA', im.split()+(ImageChops.invert(im.point(T).convert('L').point(255*[0]+[255])),))
                #if isinstance(fn,str): im.save(fn+'_masked.gif','GIF')
            for a,d in ('resolution',self._dpi),('resolution unit','inch'):
                configPIL[a] = configPIL.get(a,d)
        configPIL.setdefault('chops_invert',0)
        if configPIL.pop('chops_invert'):
            from PIL import ImageChops
            im = ImageChops.invert(im)
        configPIL.setdefault('preSaveCB',None)
        preSaveCB=configPIL.pop('preSaveCB')
        if preSaveCB:
            im = preSaveCB(im)
        im.save(fn,fmt,**configPIL)
        if not hasattr(fn,'write') and os.name=='mac':
            from reportlab.lib.utils import markfilename
            markfilename(fn,ext=fmt)

    def saveToString(self,fmt='GIF'):
        s = BytesIO()
        self.saveToFile(s,fmt=fmt)
        return s.getvalue()

    def _saveToBMP(self,f):
        '''
        Niki Spahiev, <niki@vintech.bg>, asserts that this is a respectable way to get BMP without PIL
        f is a file like object to which the BMP is written
        '''
        import struct
        gs = self._gs
        if self._backend=='rlPyCairo' and gs._fmt=='ARGB32':    #pixBuf would have 4 bytes
            gs._fmt = 'RGB24'   #force 3 bytes out until our BMP allows Alpha
            pix = gs.pixBuf
            gs._fmt = 'ARGB32'
        else:
            pix = gs.pixBuf
        width, height = gs.width, gs.height
        f.write(struct.pack('=2sLLLLLLhh24x','BM',len(pix)+54,0,54,40,width,height,1,24))
        rowb = width * 3
        for o in range(len(pix),0,-rowb):
            f.write(pix[o-rowb:o])
        f.write( '\0' * 14 )

    def setFont(self,fontName,fontSize,leading=None):
        _setFont(self._gs,fontName,fontSize)

    def __setattr__(self,name,value):
        setattr(self._gs,name,value)

    def __getattr__(self,name):
        return getattr(self._gs,name)

    def fillstrokepath(self,stroke=1,fill=1):
        if fill: self.pathFill()
        if stroke: self.pathStroke()

    def _bezierArcSegmentCCW(self, cx,cy, rx,ry, theta0, theta1):
        """compute the control points for a bezier arc with theta1-theta0 <= 90.
        Points are computed for an arc with angle theta increasing in the
        counter-clockwise (CCW) direction.  returns a tuple with starting point
        and 3 control points of a cubic bezier curve for the curvto opertator"""

        # Requires theta1 - theta0 <= 90 for a good approximation
        assert abs(theta1 - theta0) <= 90
        cos0 = cos(pi*theta0/180.0)
        sin0 = sin(pi*theta0/180.0)
        x0 = cx + rx*cos0
        y0 = cy + ry*sin0

        cos1 = cos(pi*theta1/180.0)
        sin1 = sin(pi*theta1/180.0)

        x3 = cx + rx*cos1
        y3 = cy + ry*sin1

        dx1 = -rx * sin0
        dy1 = ry * cos0

        #from pdfgeom
        halfAng = pi*(theta1-theta0)/(2.0 * 180.0)
        k = abs(4.0 / 3.0 * (1.0 - cos(halfAng) ) /(sin(halfAng)) )
        x1 = x0 + dx1 * k
        y1 = y0 + dy1 * k

        dx2 = -rx * sin1
        dy2 = ry * cos1

        x2 = x3 - dx2 * k
        y2 = y3 - dy2 * k
        return ((x0,y0), ((x1,y1), (x2,y2), (x3,y3)) )

    def bezierArcCCW(self, cx,cy, rx,ry, theta0, theta1):
        """return a set of control points for Bezier approximation to an arc
        with angle increasing counter clockwise. No requirement on (theta1-theta0) <= 90
        However, it must be true that theta1-theta0 > 0."""

        # I believe this is also clockwise
        # pretty much just like Robert Kern's pdfgeom.BezierArc
        angularExtent = theta1 - theta0
        # break down the arc into fragments of <=90 degrees
        if abs(angularExtent) <= 90.0:  # we just need one fragment
            angleList = [(theta0,theta1)]
        else:
            Nfrag = int( ceil( abs(angularExtent)/90.) )
            fragAngle = float(angularExtent)/ Nfrag  # this could be negative
            angleList = []
            for ii in range(Nfrag):
                a = theta0 + ii * fragAngle
                b = a + fragAngle # hmm.. is I wonder if this is precise enought
                angleList.append((a,b))

        ctrlpts = []
        for (a,b) in angleList:
            if not ctrlpts: # first time
                [(x0,y0), pts] = self._bezierArcSegmentCCW(cx,cy, rx,ry, a,b)
                ctrlpts.append(pts)
            else:
                [(tmpx,tmpy), pts] = self._bezierArcSegmentCCW(cx,cy, rx,ry, a,b)
                ctrlpts.append(pts)
        return ((x0,y0), ctrlpts)

    def addEllipsoidalArc(self, cx,cy, rx, ry, ang1, ang2):
        """adds an ellisesoidal arc segment to a path, with an ellipse centered
        on cx,cy and with radii (major & minor axes) rx and ry.  The arc is
        drawn in the CCW direction.  Requires: (ang2-ang1) > 0"""

        ((x0,y0), ctrlpts) = self.bezierArcCCW(cx,cy, rx,ry,ang1,ang2)

        self.lineTo(x0,y0)
        for ((x1,y1), (x2,y2),(x3,y3)) in ctrlpts:
            self.curveTo(x1,y1,x2,y2,x3,y3)

    def drawCentredString(self, x, y, text, text_anchor='middle', direction=None, shaping=False):
        self.drawString(x,y,text, text_anchor=text_anchor,direction=direction, shaping=shaping)

    def drawRightString(self, text, x, y, direction=None):
        self.drawString(text,x,y,text_anchor='end',direction=direction)

    def drawString(self, x, y, text, _fontInfo=None, text_anchor='left', direction=None, shaping=False):
        gs = self._gs
        gs_fontSize = gs.fontSize
        gs_fontName = gs.fontName
        if _fontInfo and _fontInfo!=(gs_fontSize,gs_fontName):
            fontName, fontSize = _fontInfo
            _setFont(gs,fontName,fontSize)
        else:
            fontName = gs_fontName
            fontSize = gs_fontSize

        text, textLen = bidiShapedText(text,direction,fontName=fontName,fontSize=fontSize,shaping=shaping)

        try:
            if text_anchor in ('end','middle', 'end'):
                textLen = stringWidth(text, fontName,fontSize)
                if text_anchor=='end':
                    x -= textLen
                elif text_anchor=='middle':
                    x -= textLen/2.
                elif text_anchor=='numeric':
                    x -= numericXShift(text_anchor,text,textLen,fontName,fontSize)

            if self._backend=='rlPyCairo':
                gs.drawString(x,y,text)
            else:
                font = getFont(fontName)
                if font._dynamicFont:
                    gs.drawString(x,y,text)
                else:
                    fc = font
                    if not isUnicode(text):
                        try:
                            text = text.decode('utf8')
                        except UnicodeDecodeError as e:
                            i,j = e.args[2:4]
                            raise UnicodeDecodeError(*(e.args[:4]+('%s\n%s-->%s<--%s' % (e.args[4],text[i-10:i],text[i:j],text[j:j+10]),)))

                    FT = unicode2T1(text,[font]+font.substitutionFonts)
                    n = len(FT)
                    nm1 = n-1
                    for i in range(n):
                        f, t = FT[i]
                        if f!=fc:
                            _setFont(gs,f.fontName,fontSize)
                            fc = f
                        gs.drawString(x,y,t)
                        if i!=nm1:
                            x += f.stringWidth(t.decode(f.encName),fontSize)
        finally:
            gs.setFont(gs_fontName,gs_fontSize)

    def line(self,x1,y1,x2,y2):
        if self.strokeColor is not None:
            self.pathBegin()
            self.moveTo(x1,y1)
            self.lineTo(x2,y2)
            self.pathStroke()

    def rect(self,x,y,width,height,stroke=1,fill=1):
        self.pathBegin()
        self.moveTo(x, y)
        self.lineTo(x+width, y)
        self.lineTo(x+width, y + height)
        self.lineTo(x, y + height)
        self.pathClose()
        self.fillstrokepath(stroke=stroke,fill=fill)

    def roundRect(self, x, y, width, height, rx,ry):
        """rect(self, x, y, width, height, rx,ry):
        Draw a rectangle if rx or rx and ry are specified the corners are
        rounded with ellipsoidal arcs determined by rx and ry
        (drawn in the counter-clockwise direction)"""
        if rx==0: rx = ry
        if ry==0: ry = rx
        x2 = x + width
        y2 = y + height
        self.pathBegin()
        self.moveTo(x+rx,y)
        self.addEllipsoidalArc(x2-rx, y+ry, rx, ry, 270, 360 )
        self.addEllipsoidalArc(x2-rx, y2-ry, rx, ry, 0, 90)
        self.addEllipsoidalArc(x+rx, y2-ry, rx, ry, 90, 180)
        self.addEllipsoidalArc(x+rx, y+ry, rx, ry, 180,  270)
        self.pathClose()
        self.fillstrokepath()

    def circle(self, cx, cy, r):
        "add closed path circle with center cx,cy and axes r: counter-clockwise orientation"
        self.ellipse(cx,cy,r,r)

    def ellipse(self, cx,cy,rx,ry):
        """add closed path ellipse with center cx,cy and axes rx,ry: counter-clockwise orientation
        (remember y-axis increases downward) """
        self.pathBegin()
        # first segment
        x0 = cx + rx   # (x0,y0) start pt
        y0 = cy

        x3 = cx        # (x3,y3) end pt of arc
        y3 = cy-ry

        x1 = cx+rx
        y1 = cy-ry*BEZIER_ARC_MAGIC

        x2 = x3 + rx*BEZIER_ARC_MAGIC
        y2 = y3
        self.moveTo(x0, y0)
        self.curveTo(x1,y1,x2,y2,x3,y3)
        # next segment
        x0 = x3
        y0 = y3

        x3 = cx-rx
        y3 = cy

        x1 = cx-rx*BEZIER_ARC_MAGIC
        y1 = cy-ry

        x2 = x3
        y2 = cy- ry*BEZIER_ARC_MAGIC
        self.curveTo(x1,y1,x2,y2,x3,y3)
        # next segment
        x0 = x3
        y0 = y3

        x3 = cx
        y3 = cy+ry

        x1 = cx-rx
        y1 = cy+ry*BEZIER_ARC_MAGIC

        x2 = cx -rx*BEZIER_ARC_MAGIC
        y2 = cy+ry
        self.curveTo(x1,y1,x2,y2,x3,y3)
        #last segment
        x0 = x3
        y0 = y3

        x3 = cx+rx
        y3 = cy

        x1 = cx+rx*BEZIER_ARC_MAGIC
        y1 = cy+ry

        x2 = cx+rx
        y2 = cy+ry*BEZIER_ARC_MAGIC
        self.curveTo(x1,y1,x2,y2,x3,y3)
        self.pathClose()

    def saveState(self):
        '''do nothing for compatibility'''
        pass

    def setFillColor(self,aColor):
        self.fillColor = self._colorConverter(aColor)
        alpha = getattr(aColor,'alpha',None)
        if alpha is not None:
            self.fillOpacity = alpha

    def setStrokeColor(self,aColor):
        self.strokeColor = self._colorConverter(aColor)
        alpha = getattr(aColor,'alpha',None)
        if alpha is not None:
            self.strokeOpacity = alpha

    restoreState = saveState

    # compatibility routines
    def setLineCap(self,cap):
        self.lineCap = cap

    def setLineJoin(self,join):
        self.lineJoin = join

    def setLineWidth(self,width):
        self.strokeWidth = width

    def stringWidth(self, text, fontName=None, fontSize=None):
        return stringWidth(text, fontName or self._gs.fontName,
                                (fontSize if fontSize is not None else self._gs.fontSize))
def drawToPMCanvas(d, dpi=72, bg=0xffffff, configPIL=None, showBoundary=rl_config._unset_,backend=rl_config.renderPMBackend,backendFmt='RGB',**kwds):
    d = renderScaledDrawing(d)
    c = PMCanvas(d.width, d.height, dpi=dpi, bg=bg, configPIL=configPIL, backend=backend,backendFmt=backendFmt)
    draw(d, c, 0, 0, showBoundary=showBoundary,**kwds)
    return c

def drawToPIL(d, dpi=72, bg=0xffffff, configPIL=None, showBoundary=rl_config._unset_,backend=rl_config.renderPMBackend,backendFmt='RGB', **kwds):
    return drawToPMCanvas(d, dpi=dpi, bg=bg, configPIL=configPIL, showBoundary=showBoundary, backend=backend,backendFmt=backendFmt, **kwds).toPIL()

def drawToPILP(d, dpi=72, bg=0xffffff, configPIL=None, showBoundary=rl_config._unset_,backend=rl_config.renderPMBackend,backendFmt='RGB', **kwds):
    Image = _getImage()
    im = drawToPIL(d, dpi=dpi, bg=bg, configPIL=configPIL, showBoundary=showBoundary,backend=backend,backendFmt=backendFmt, **kwds)
    return im.convert("P", dither=Image.NONE, palette=Image.ADAPTIVE)

def drawToFile(d,fn,fmt='GIF', dpi=72, bg=0xffffff, configPIL=None, showBoundary=rl_config._unset_,backend=rl_config.renderPMBackend,backendFmt='RGB', **kwds):
    '''create a pixmap and draw drawing, d to it then save as a file
    configPIL dict is passed to image save method'''
    c = drawToPMCanvas(d, dpi=dpi, bg=bg, configPIL=configPIL, showBoundary=showBoundary,backend=backend,backendFmt=backendFmt, **kwds)
    c.saveToFile(fn,fmt)

def drawToString(d,fmt='GIF', dpi=72, bg=0xffffff, configPIL=None, showBoundary=rl_config._unset_,backend=rl_config.renderPMBackend,backendFmt='RGB',**kwds):
    s = BytesIO()
    drawToFile(d,s,fmt=fmt, dpi=dpi, bg=bg, configPIL=configPIL,backend=backend,backendFmt=backendFmt, **kwds)
    return s.getvalue()

save = drawToFile

def test(outDir='pmout', shout=False):
    def ext(x):
        if x=='tiff': x='tif'
        return x
    #grab all drawings from the test module and write out.
    #make a page of links in HTML to assist viewing.
    import os
    from reportlab.graphics import testshapes
    from reportlab.rl_config import verbose
    getAllTestDrawings = testshapes.getAllTestDrawings
    drawings = []
    if not os.path.isdir(outDir):
        os.mkdir(outDir)
    htmlTop = """<html><head><title>renderPM output results</title></head>
    <body>
    <h1>renderPM results of output</h1>
    """
    htmlBottom = """</body>
    </html>
    """
    html = [htmlTop]
    names = {}
    argv = sys.argv[1:]
    E = [a for a in argv if a.startswith('--ext=')]
    if not E:
        E = ['gif','tiff', 'png', 'jpg', 'pct', 'py', 'svg']
    else:
        for a in E:
            argv.remove(a)
        E = (','.join([a[6:] for a in E])).split(',')

    errs = []
    import traceback
    from xml.sax.saxutils import escape
    def handleError(name,fmt):
        msg = 'Problem drawing %s fmt=%s file'%(name,fmt)
        if shout or verbose>2: print(msg)
        errs.append('<br/><h2 style="color:red">%s</h2>' % msg)
        buf = StringIO()
        traceback.print_exc(file=buf)
        errs.append('<pre>%s</pre>' % escape(buf.getvalue()))

    #print in a loop, with their doc strings
    for (drawing, docstring, name) in getAllTestDrawings(doTTF=hasattr(_pmBackend,'ft_get_face')):
        i = names[name] = names.setdefault(name,0)+1
        if i>1: name += '.%02d' % (i-1)
        if argv and name not in argv: continue
        fnRoot = name
        w = int(drawing.width)
        h = int(drawing.height)
        html.append('<hr><h2>Drawing %s</h2>\n<pre>%s</pre>' % (name, docstring))

        for k in E:
            if k in ['gif','png','jpg','pct']:
                html.append('<p>%s format</p>\n' % k.upper())
            try:
                filename = '%s.%s' % (fnRoot, ext(k))
                fullpath = os.path.join(outDir, filename)
                if os.path.isfile(fullpath):
                    os.remove(fullpath)
                if k=='pct':
                    drawToFile(drawing,fullpath,fmt=k,configPIL={'transparent':white})
                elif k in ['py','svg']:
                    drawing.save(formats=['py','svg'],outDir=outDir,fnRoot=fnRoot)
                else:
                    drawToFile(drawing,fullpath,fmt=k)
                if k in ['gif','png','jpg']:
                    html.append('<img src="%s" border="1"><br>\n' % filename)
                elif k=='py':
                    html.append('<a href="%s">python source</a><br>\n' % filename)
                elif k=='svg':
                    html.append('<a href="%s">SVG</a><br>\n' % filename)
                if shout or verbose>2: print('wrote %s'%ascii(fullpath))
            except AttributeError:
                handleError(name,k)
        if os.environ.get('RL_NOEPSPREVIEW','0')=='1': drawing.__dict__['preview'] = 0
        for k in ('eps', 'pdf'):
            try:
                drawing.save(formats=[k],outDir=outDir,fnRoot=fnRoot)
            except:
                handleError(name,k)

    if errs:
        html[0] = html[0].replace('</h1>',' <a href="#errors" style="color: red">(errors)</a></h1>')
        html.append('<a name="errors"/>')
        html.extend(errs)
    html.append(htmlBottom)
    htmlFileName = os.path.join(outDir, 'pm-index.html')
    with open(htmlFileName, 'w') as f:
        f.writelines(html)
    if sys.platform=='mac':
        from reportlab.lib.utils import markfilename
        markfilename(htmlFileName,ext='HTML')
    if shout or verbose>2: print('wrote %s' % htmlFileName)

if __name__=='__main__':
    test(shout=True)