class _BoardCanvas(Canvas):
def __init__(self):
self._dragging = False
Canvas.__init__(self, Width=WIDTH, Height=HEIGHT)
canvasElement = self.getElement()
#Register for canvas mouse events
self._proc = Processing(DOM.getFirstChild(canvasElement))
self._proc.setup = (lambda: self.setup_proc())
self._proc.draw = None
self._proc.init()
DOM.sinkEvents(canvasElement, Event.MOUSEEVENTS)
DOM.setEventListener(canvasElement, self)
self._currentPointList = []
self._x = None
self._y = None
self._callback_Redraw = None
self._callback_AddStroke = None
self._callback_DeleteStroke = None
def onBrowserEvent(self, event):
kind = DOM.eventGetType(event)
x = DOM.eventGetClientX(event) - DOM.getAbsoluteLeft(self.getElement())
y = DOM.eventGetClientY(event) - DOM.getAbsoluteTop(self.getElement())
y = HEIGHT - y
if kind == "mousedown":
self.onMouseDown(x,y)
self._dragging = True
elif kind == "mousemove" and self._dragging:
self.onMouseDrag(x,y)
elif (kind == "mouseup" or kind == "mouseout") and self._dragging:
self._dragging = False
self.onMouseUp(x,y)
def setup_proc(self):
self._proc.size(WIDTH,HEIGHT)
self._proc.background(255)
self._proc.stroke("#000000")
self._proc.smooth()
def redraw(self):
if self._callback_Redraw is not None:
self.clear_board()
self._callback_Redraw()
def clear_board(self):
self._proc.background(255)
def onMouseDown(self, x, y):
self._x = x
self._y = y
#self.drawCircle(x,y,radius=1)
self._currentPointList.append(Point(x,y))
def onMouseDrag(self, x, y):
self.drawLine(self._x, self._y, x, y)
self._x = x
self._y = y
#self.drawCircle(x,y,radius=1)
self._currentPointList.append(Point(x,y))
def onMouseUp(self, x, y):
self.drawLine(self._x, self._y, x, y)
self._x = None
self._y = None
if self._callback_AddStroke is not None:
self._callback_AddStroke(self._currentPointList)
if self._callback_Redraw is not None:
self._callback_Redraw()
self._currentPointList = []
def setCallback_AddStroke(self, function):
self._callback_AddStroke = function
def setCallback_DeleteStroke(self, function):
self._callback_DeleteStroke = function
def setCallback_Redraw(self, function):
self._callback_Redraw = function
def drawLine(self, x1, y1, x2, y2, width=2, color="#000000"):
_y1 = HEIGHT - y1
_y2 = HEIGHT - y2
self._proc.stroke(color)
self._proc.strokeWeight(width)
self._proc.line(x1,_y1,x2,_y2)
#self._proc.stroke("#000000")
def drawCircle(self, x, y, radius=1, color="#000000", fill="", width=1.0):
"Draw a circle on the canvas at (x,y) with radius rad. Color should be 24 bit RGB string #RRGGBB. Empty string is transparent"
_y = HEIGHT - y
self._proc.stroke(color)
self._proc.strokeWeight(width)
if fill == "":
self._proc.noFill()
else:
self._proc.fill(fill)
self._proc.ellipse(x,_y,2*radius, 2*radius)
#self._proc.stroke("#000000")
def drawText (self, x, y, InText="", size=10, color="#000000"):
logger.debug("drawing text '%s' at %s, %s" % (InText, x,y))
self._proc.fill(color)
_y = HEIGHT - y
self._proc.text(InText, x, _y)