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#Copyright ReportLab Europe Ltd. 2000-2017 #see license.txt for license details #history https://hg.reportlab.com/hg-public/reportlab/log/tip/src/reportlab/graphics/widgetbase.py __version__='3.3.0' __doc__='''Base class for user-defined graphical widgets''' from reportlab.graphics import shapes from reportlab import rl_config from reportlab.lib import colors from reportlab.lib.validators import * from reportlab.lib.attrmap import * from weakref import ref as weakref_ref class PropHolder: '''Base for property holders''' _attrMap = None def verify(self): """If the _attrMap attribute is not None, this checks all expected attributes are present; no unwanted attributes are present; and (if a checking function is found) checks each attribute has a valid value. Either succeeds or raises an informative exception. """ if self._attrMap is not None: for key in self.__dict__.keys(): if key[0] != '_': msg = "Unexpected attribute %s found in %s" % (key, self) assert key in self._attrMap, msg for attr, metavalue in self._attrMap.items(): msg = "Missing attribute %s from %s" % (attr, self) assert hasattr(self, attr), msg value = getattr(self, attr) args = (value, attr, self.__class__.__name__) assert metavalue.validate(value), "Invalid value %s for attribute %s in class %s" % args if rl_config.shapeChecking: """This adds the ability to check every attribute assignment as it is made. It slows down shapes but is a big help when developing. It does not get defined if rl_config.shapeChecking = 0. """ def __setattr__(self, name, value): """By default we verify. This could be off in some parallel base classes.""" validateSetattr(self,name,value) def getProperties(self,recur=1): """Returns a list of all properties which can be edited and which are not marked as private. This may include 'child widgets' or 'primitive shapes'. You are free to override this and provide alternative implementations; the default one simply returns everything without a leading underscore. """ from reportlab.lib.validators import isValidChild # TODO when we need it, but not before - # expose sequence contents? props = {} for name in self.__dict__.keys(): if name[0:1] != '_': component = getattr(self, name) if recur and isValidChild(component): # child object, get its properties too childProps = component.getProperties(recur=recur) for childKey, childValue in childProps.items(): #key might be something indexed like '[2].fillColor' #or simple like 'fillColor'; in the former case we #don't need a '.' between me and my child. if childKey[0] == '[': props['%s%s' % (name, childKey)] = childValue else: props['%s.%s' % (name, childKey)] = childValue else: props[name] = component return props def setProperties(self, propDict): """Permits bulk setting of properties. These may include child objects e.g. "chart.legend.width = 200". All assignments will be validated by the object as if they were set individually in python code. All properties of a top-level object are guaranteed to be set before any of the children, which may be helpful to widget designers. """ childPropDicts = {} for name, value in propDict.items(): parts = name.split('.', 1) if len(parts) == 1: #simple attribute, set it now setattr(self, name, value) else: (childName, remains) = parts try: childPropDicts[childName][remains] = value except KeyError: childPropDicts[childName] = {remains: value} # now assign to children for childName, childPropDict in childPropDicts.items(): child = getattr(self, childName) child.setProperties(childPropDict) def dumpProperties(self, prefix=""): """Convenience. Lists them on standard output. You may provide a prefix - mostly helps to generate code samples for documentation. """ propList = list(self.getProperties().items()) propList.sort() if prefix: prefix = prefix + '.' for (name, value) in propList: print('%s%s = %s' % (prefix, name, value)) class Widget(PropHolder, shapes.UserNode): """Base for all user-defined widgets. Keep as simple as possible. Does not inherit from Shape so that we can rewrite shapes without breaking widgets and vice versa.""" def _setKeywords(self,**kw): for k,v in kw.items(): if k not in self.__dict__: setattr(self,k,v) def draw(self): msg = "draw() must be implemented for each Widget!" raise shapes.NotImplementedError(msg) def demo(self): msg = "demo() must be implemented for each Widget!" raise shapes.NotImplementedError(msg) def provideNode(self): return self.draw() def getBounds(self): "Return outer boundary as x1,y1,x2,y2. Can be overridden for efficiency" return self.draw().getBounds() class ScaleWidget(Widget): '''Contents with a scale and offset''' _attrMap = AttrMap( x = AttrMapValue(isNumber,desc="x offset"), y = AttrMapValue(isNumber,desc="y offset"), scale = AttrMapValue(isNumber,desc="scale"), contents = AttrMapValue(None,desc="Contained drawable elements"), ) def __init__(self,x=0,y=0,scale=1.0,contents=None): self.x = x self.y = y if not contents: contents=[] elif not isinstance(contents,(tuple,list)): contents = (contents,) self.contents = list(contents) self.scale = scale def draw(self): return shapes.Group(transform=(self.scale,0,0,self.scale,self.x,self.y),*self.contents) _ItemWrapper={} class CloneMixin: def clone(self,**kwds): n = self.__class__() n.__dict__.clear() n.__dict__.update(self.__dict__) if kwds: n.__dict__.update(kwds) return n class TypedPropertyCollection(PropHolder): """A container with properties for objects of the same kind. This makes it easy to create lists of objects. You initialize it with a class of what it is to contain, and that is all you can add to it. You can assign properties to the collection as a whole, or to a numeric index within it; if so it creates a new child object to hold that data. So: wedges = TypedPropertyCollection(WedgeProperties) wedges.strokeWidth = 2 # applies to all wedges.strokeColor = colors.red # applies to all wedges[3].strokeColor = colors.blue # only to one The last line should be taken as a prescription of how to create wedge no. 3 if one is needed; no error is raised if there are only two data points. We try and make sensible use of tuple indices. line[(3,x)] is backed by line[(3,)] == line[3] & line """ def __init__(self, exampleClass, **kwds): #give it same validation rules as what it holds self.__dict__['_value'] = exampleClass(**kwds) self.__dict__['_children'] = {} def wKlassFactory(self,Klass): class WKlass(Klass,CloneMixin): def __getattr__(self,name): try: return self.__class__.__bases__[0].__getattr__(self,name) except: parent = self.parent c = parent._children x = self.__propholder_index__ while x: if x in c: return getattr(c[x],name) x = x[:-1] return getattr(parent,name) @property def parent(self): return self.__propholder_parent__() return WKlass def __getitem__(self, x): if isinstance(x,(tuple,list)): x = tuple(x) else: x = (x,) try: return self._children[x] except KeyError: Klass = self._value.__class__ if Klass in _ItemWrapper: WKlass = _ItemWrapper[Klass] else: _ItemWrapper[Klass] = WKlass = self.wKlassFactory(Klass) child = WKlass() for i in filter(lambda x,K=list(child.__dict__.keys()): x in K,list(child._attrMap.keys())): del child.__dict__[i] child.__dict__.update(dict( __propholder_parent__ = weakref_ref(self), __propholder_index__ = x[:-1]) ) self._children[x] = child return child def __contains__(self,key): if isinstance(key,(tuple,list)): key = tuple(key) else: key = key, return key in self._children def __setitem__(self, key, value): assert isinstance(value, self._value.__class__), ( "This collection can only hold objects of type %s" % self._value.__class__.__name__) def __len__(self): return len(list(self._children.keys())) def getProperties(self,recur=1): # return any children which are defined and whatever # differs from the parent props = {} for key, value in self._value.getProperties(recur=recur).items(): props['%s' % key] = value for idx in self._children.keys(): childProps = self._children[idx].getProperties(recur=recur) for key, value in childProps.items(): if not hasattr(self,key) or getattr(self, key)!=value: newKey = '[%s].%s' % (idx if len(idx)>1 else idx[0], key) props[newKey] = value return props def setVector(self,**kw): for name, value in kw.items(): for i, v in enumerate(value): setattr(self[i],name,v) def __getattr__(self,name): return getattr(self._value,name) def __setattr__(self,name,value): return setattr(self._value,name,value) def tpcGetItem(obj,x): '''return obj if it's not a TypedPropertyCollection else obj[x]''' return obj[x] if isinstance(obj,TypedPropertyCollection) else obj def isWKlass(obj): if not hasattr(obj,'__propholder_parent__'): return ph = obj.__propholder_parent__ if not isinstance(ph,weakref_ref): return return isinstance(ph(),TypedPropertyCollection) ## No longer needed! class StyleProperties(PropHolder): """A container class for attributes used in charts and legends. Attributes contained can be those for any graphical element (shape?) in the ReportLab graphics package. The idea for this container class is to be useful in combination with legends and/or the individual appearance of data series in charts. A legend could be as simple as a wrapper around a list of style properties, where the 'desc' attribute contains a descriptive string and the rest could be used by the legend e.g. to draw something like a color swatch. The graphical presentation of the legend would be its own business, though. A chart could be inspecting a legend or, more directly, a list of style properties to pick individual attributes that it knows about in order to render a particular row of the data. A bar chart e.g. could simply use 'strokeColor' and 'fillColor' for drawing the bars while a line chart could also use additional ones like strokeWidth. """ _attrMap = AttrMap( strokeWidth = AttrMapValue(isNumber,desc='width of the stroke line'), strokeLineCap = AttrMapValue(isNumber,desc='Line cap 0=butt, 1=round & 2=square',advancedUsage=1), strokeLineJoin = AttrMapValue(isNumber,desc='Line join 0=miter, 1=round & 2=bevel',advancedUsage=1), strokeMiterLimit = AttrMapValue(None,desc='miter limit control miter line joins',advancedUsage=1), strokeDashArray = AttrMapValue(isListOfNumbersOrNone,desc='dashing patterns e.g. (1,3)'), strokeOpacity = AttrMapValue(isNumber,desc='level of transparency (alpha) accepts values between 0..1',advancedUsage=1), strokeColor = AttrMapValue(isColorOrNone,desc='the color of the stroke'), fillColor = AttrMapValue(isColorOrNone,desc='the filling color'), desc = AttrMapValue(isString), ) def __init__(self, **kwargs): "Initialize with attributes if any." for k, v in kwargs.items(): setattr(self, k, v) def __setattr__(self, name, value): "Verify attribute name and value, before setting it." validateSetattr(self,name,value) class TwoCircles(Widget): def __init__(self): self.leftCircle = shapes.Circle(100,100,20, fillColor=colors.red) self.rightCircle = shapes.Circle(300,100,20, fillColor=colors.red) def draw(self): return shapes.Group(self.leftCircle, self.rightCircle) class Face(Widget): """This draws a face with two eyes. It exposes a couple of properties to configure itself and hides all other details. """ _attrMap = AttrMap( x = AttrMapValue(isNumber), y = AttrMapValue(isNumber), size = AttrMapValue(isNumber), skinColor = AttrMapValue(isColorOrNone), eyeColor = AttrMapValue(isColorOrNone), mood = AttrMapValue(OneOf('happy','sad','ok')), ) def __init__(self): self.x = 10 self.y = 10 self.size = 80 self.skinColor = None self.eyeColor = colors.blue self.mood = 'happy' def demo(self): pass def draw(self): s = self.size # abbreviate as we will use this a lot g = shapes.Group() g.transform = [1,0,0,1,self.x, self.y] # background g.add(shapes.Circle(s * 0.5, s * 0.5, s * 0.5, fillColor=self.skinColor)) # left eye g.add(shapes.Circle(s * 0.35, s * 0.65, s * 0.1, fillColor=colors.white)) g.add(shapes.Circle(s * 0.35, s * 0.65, s * 0.05, fillColor=self.eyeColor)) # right eye g.add(shapes.Circle(s * 0.65, s * 0.65, s * 0.1, fillColor=colors.white)) g.add(shapes.Circle(s * 0.65, s * 0.65, s * 0.05, fillColor=self.eyeColor)) # nose g.add(shapes.Polygon( points=[s * 0.5, s * 0.6, s * 0.4, s * 0.3, s * 0.6, s * 0.3], fillColor=None)) # mouth if self.mood == 'happy': offset = -0.05 elif self.mood == 'sad': offset = +0.05 else: offset = 0 g.add(shapes.Polygon( points = [ s * 0.3, s * 0.2, #left of mouth s * 0.7, s * 0.2, #right of mouth s * 0.6, s * (0.2 + offset), # the bit going up or down s * 0.4, s * (0.2 + offset) # the bit going up or down ], fillColor = colors.pink, strokeColor = colors.red, strokeWidth = s * 0.03 )) return g class TwoFaces(Widget): def __init__(self): self.faceOne = Face() self.faceOne.mood = "happy" self.faceTwo = Face() self.faceTwo.x = 100 self.faceTwo.mood = "sad" def draw(self): """Just return a group""" return shapes.Group(self.faceOne, self.faceTwo) def demo(self): """The default case already looks good enough, no implementation needed here""" pass class Sizer(Widget): "Container to show size of all enclosed objects" _attrMap = AttrMap(BASE=shapes.SolidShape, contents = AttrMapValue(isListOfShapes,desc="Contained drawable elements"), ) def __init__(self, *elements): self.contents = [] self.fillColor = colors.cyan self.strokeColor = colors.magenta for elem in elements: self.add(elem) def _addNamedNode(self,name,node): 'if name is not None add an attribute pointing to node and add to the attrMap' if name: if name not in list(self._attrMap.keys()): self._attrMap[name] = AttrMapValue(isValidChild) setattr(self, name, node) def add(self, node, name=None): """Appends non-None child node to the 'contents' attribute. In addition, if a name is provided, it is subsequently accessible by name """ # propagates properties down if node is not None: assert isValidChild(node), "Can only add Shape or UserNode objects to a Group" self.contents.append(node) self._addNamedNode(name,node) def getBounds(self): # get bounds of each object if self.contents: b = [] for elem in self.contents: b.append(elem.getBounds()) return shapes.getRectsBounds(b) else: return (0,0,0,0) def draw(self): g = shapes.Group() (x1, y1, x2, y2) = self.getBounds() r = shapes.Rect( x = x1, y = y1, width = x2-x1, height = y2-y1, fillColor = self.fillColor, strokeColor = self.strokeColor ) g.add(r) for elem in self.contents: g.add(elem) return g class CandleStickProperties(PropHolder): _attrMap = AttrMap( strokeWidth = AttrMapValue(isNumber, desc='Width of a line.'), strokeColor = AttrMapValue(isColorOrNone, desc='Color of a line or border.'), strokeDashArray = AttrMapValue(isListOfNumbersOrNone, desc='Dash array of a line.'), crossWidth = AttrMapValue(isNumberOrNone,desc="cross line width",advancedUsage=1), crossLo = AttrMapValue(isNumberOrNone,desc="cross line low value",advancedUsage=1), crossHi = AttrMapValue(isNumberOrNone,desc="cross line high value",advancedUsage=1), boxWidth = AttrMapValue(isNumberOrNone,desc="width of the box part",advancedUsage=1), boxFillColor = AttrMapValue(isColorOrNone, desc='fill color of box'), boxStrokeColor = AttrMapValue(NotSetOr(isColorOrNone), desc='stroke color of box'), boxStrokeDashArray = AttrMapValue(NotSetOr(isListOfNumbersOrNone), desc='Dash array of the box.'), boxStrokeWidth = AttrMapValue(NotSetOr(isNumber), desc='Width of the box lines.'), boxLo = AttrMapValue(isNumberOrNone,desc="low value of the box",advancedUsage=1), boxMid = AttrMapValue(isNumberOrNone,desc="middle box line value",advancedUsage=1), boxHi = AttrMapValue(isNumberOrNone,desc="high value of the box",advancedUsage=1), boxSides = AttrMapValue(isBoolean,desc="whether to show box sides",advancedUsage=1), position = AttrMapValue(isNumberOrNone,desc="position of the candle",advancedUsage=1), chart = AttrMapValue(None,desc="our chart",advancedUsage=1), candleKind = AttrMapValue(OneOf('vertical','horizontal'),desc="candle direction",advancedUsage=1), axes = AttrMapValue(SequenceOf(isString,emptyOK=0,lo=2,hi=2),desc="candle direction",advancedUsage=1), ) def __init__(self,**kwds): self.strokeWidth = kwds.pop('strokeWidth',1) self.strokeColor = kwds.pop('strokeColor',colors.black) self.strokeDashArray = kwds.pop('strokeDashArray',None) self.crossWidth = kwds.pop('crossWidth',5) self.crossLo = kwds.pop('crossLo',None) self.crossHi = kwds.pop('crossHi',None) self.boxWidth = kwds.pop('boxWidth',None) self.boxFillColor = kwds.pop('boxFillColor',None) self.boxStrokeColor =kwds.pop('boxStrokeColor',NotSetOr._not_set) self.boxStrokeWidth =kwds.pop('boxStrokeWidth',NotSetOr._not_set) self.boxStrokeDashArray =kwds.pop('boxStrokeDashArray',NotSetOr._not_set) self.boxLo = kwds.pop('boxLo',None) self.boxMid = kwds.pop('boxMid',None) self.boxHi = kwds.pop('boxHi',None) self.boxSides = kwds.pop('boxSides',True) self.position = kwds.pop('position',None) self.candleKind = kwds.pop('candleKind','vertical') self.axes = kwds.pop('axes',['categoryAxis','valueAxis']) chart = kwds.pop('chart',None) self.chart = weakref_ref(chart) if chart else (lambda:None) def __call__(self,_x,_y,_size,_color): '''the symbol interface''' chart = self.chart() xA = getattr(chart,self.axes[0]) _xScale = getattr(xA,'midScale',None) if not _xScale: _xScale = getattr(xA,'scale') xScale = lambda x: _xScale(x) if x is not None else None yA = getattr(chart,self.axes[1]) _yScale = getattr(yA,'midScale',None) if not _yScale: _yScale = getattr(yA,'scale') yScale = lambda x: _yScale(x) if x is not None else None G = shapes.Group().add strokeWidth = self.strokeWidth strokeColor = self.strokeColor strokeDashArray = self.strokeDashArray crossWidth = self.crossWidth crossLo = yScale(self.crossLo) crossHi = yScale(self.crossHi) boxWidth = self.boxWidth boxFillColor = self.boxFillColor boxStrokeColor = NotSetOr.conditionalValue(self.boxStrokeColor,strokeColor) boxStrokeWidth = NotSetOr.conditionalValue(self.boxStrokeWidth,strokeWidth) boxStrokeDashArray = NotSetOr.conditionalValue(self.boxStrokeDashArray,strokeDashArray) boxLo = yScale(self.boxLo) boxMid = yScale(self.boxMid) boxHi = yScale(self.boxHi) position = xScale(self.position) candleKind = self.candleKind haveBox = None not in (boxWidth,boxLo,boxHi) haveLine = None not in (crossLo,crossHi) def aLine(x0,y0,x1,y1): if candleKind!='vertical': x0,y0 = y0,x0 x1,y1 = y1,x1 G(shapes.Line(x0,y0,x1,y1,strokeWidth=strokeWidth,strokeColor=strokeColor,strokeDashArray=strokeDashArray)) if haveBox: boxLo, boxHi = min(boxLo,boxHi), max(boxLo,boxHi) if haveLine: crossLo, crossHi = min(crossLo,crossHi), max(crossLo,crossHi) if not haveBox or crossLo>=boxHi or crossHi<=boxLo: aLine(position,crossLo,position,crossHi) if crossWidth is not None: aLine(position-crossWidth*0.5,crossLo,position+crossWidth*0.5,crossLo) aLine(position-crossWidth*0.5,crossHi,position+crossWidth*0.5,crossHi) elif haveBox: if crossLo<boxLo: aLine(position,crossLo,position,boxLo) aLine(position-crossWidth*0.5,crossLo,position+crossWidth*0.5,crossLo) if crossHi>boxHi: aLine(position,boxHi,position,crossHi) aLine(position-crossWidth*0.5,crossHi,position+crossWidth*0.5,crossHi) if haveBox: x = position - boxWidth*0.5 y = boxLo h = boxHi - boxLo w = boxWidth if candleKind!='vertical': x, y, w, h = y, x, h, w G(shapes.Rect(x,y,w,h,strokeColor=boxStrokeColor if self.boxSides else None,strokeWidth=boxStrokeWidth,strokeDashArray=boxStrokeDashArray,fillColor=boxFillColor)) if not self.boxSides: aLine(position-0.5*boxWidth,boxHi,position+0.5*boxWidth,boxHi) aLine(position-0.5*boxWidth,boxLo,position+0.5*boxWidth,boxLo) if boxMid is not None: aLine(position-0.5*boxWidth,boxMid,position+0.5*boxWidth,boxMid) return G.__self__ def CandleSticks(**kwds): return TypedPropertyCollection(CandleStickProperties,**kwds) def test(): from reportlab.graphics.charts.piecharts import WedgeProperties wedges = TypedPropertyCollection(WedgeProperties) wedges.fillColor = colors.red wedges.setVector(fillColor=(colors.blue,colors.green,colors.white)) print(len(_ItemWrapper)) d = shapes.Drawing(400, 200) tc = TwoCircles() d.add(tc) from reportlab.graphics import renderPDF renderPDF.drawToFile(d, 'sample_widget.pdf', 'A Sample Widget') print('saved sample_widget.pdf') d = shapes.Drawing(400, 200) f = Face() f.skinColor = colors.yellow f.mood = "sad" d.add(f, name='theFace') print('drawing 1 properties:') d.dumpProperties() renderPDF.drawToFile(d, 'face.pdf', 'A Sample Widget') print('saved face.pdf') d2 = d.expandUserNodes() renderPDF.drawToFile(d2, 'face_copy.pdf', 'An expanded drawing') print('saved face_copy.pdf') print('drawing 2 properties:') d2.dumpProperties() if __name__=='__main__': test()