#!/usr/bin/env python """ This is a small demo, showing how to make an object that can be moved around. It also contains a simple prototype for a "Connector" object -- a line connecting two other objects """ import wx #ver = 'local' ver = 'installed' if ver == 'installed': ## import the installed version from wx.lib.floatcanvas import NavCanvas, Resources from wx.lib.floatcanvas import FloatCanvas as FC from wx.lib.floatcanvas.Utilities import BBox print("using installed version: %s" % wx.lib.floatcanvas.__version__) elif ver == 'local': ## import a local version import sys sys.path.append("..") from floatcanvas import NavCanvas, Resources from floatcanvas import FloatCanvas as FC from floatcanvas.Utilities import BBox import numpy as np ## here we create some new mixins: class MovingObjectMixin: """ Methods required for a Moving object """ def GetOutlinePoints(self): BB = self.BoundingBox OutlinePoints = np.array( ( (BB[0,0], BB[0,1]), (BB[0,0], BB[1,1]), (BB[1,0], BB[1,1]), (BB[1,0], BB[0,1]), ) ) return OutlinePoints class ConnectorObjectMixin: """ Mixin class for DrawObjects that can be connected with lines NOte that this versionony works for Objects that have an "XY" attribute: that is, one that is derived from XHObjectMixin. """ def GetConnectPoint(self): return self.XY class MovingBitmap(FC.ScaledBitmap, MovingObjectMixin, ConnectorObjectMixin): """ ScaledBitmap Object that can be moved """ ## All we need to do is is inherit from: ## ScaledBitmap, MovingObjectMixin and ConnectorObjectMixin pass class MovingCircle(FC.Circle, MovingObjectMixin, ConnectorObjectMixin): """ ScaledBitmap Object that can be moved """ ## All we need to do is is inherit from: ## ScaledBitmap, MovingObjectMixin and ConnectorObjectMixin pass class MovingArc(FC.Arc, MovingObjectMixin, ConnectorObjectMixin): """ ScaledBitmap Object that can be moved """ ## All we need to do is is inherit from: ## ScaledBitmap, MovingObjectMixin and ConnectorObjectMixin pass class ConnectorLine(FC.LineOnlyMixin, FC.DrawObject,): """ A Line that connects two objects -- it uses the objects to get its coordinates """ ##fixme: this should be added to the Main FloatCanvas Objects some day. def __init__(self, Object1, Object2, LineColor = "Black", LineStyle = "Solid", LineWidth = 1, InForeground = False): FC.DrawObject.__init__(self, InForeground) self.Object1 = Object1 self.Object2 = Object2 self.LineColor = LineColor self.LineStyle = LineStyle self.LineWidth = LineWidth self.CalcBoundingBox() self.SetPen(LineColor,LineStyle,LineWidth) self.HitLineWidth = max(LineWidth,self.MinHitLineWidth) def CalcBoundingBox(self): self.BoundingBox = BBox.fromPoints((self.Object1.GetConnectPoint(), self.Object2.GetConnectPoint()) ) if self._Canvas: self._Canvas.BoundingBoxDirty = True def _Draw(self, dc , WorldToPixel, ScaleWorldToPixel, HTdc=None): Points = np.array( (self.Object1.GetConnectPoint(), self.Object2.GetConnectPoint()) ) Points = WorldToPixel(Points) dc.SetPen(self.Pen) dc.DrawLines(Points) if HTdc and self.HitAble: HTdc.SetPen(self.HitPen) HTdc.DrawLines(Points) class TriangleShape1(FC.Polygon, MovingObjectMixin): def __init__(self, XY, L): """ An equilateral triangle object XY is the middle of the triangle L is the length of one side of the Triangle """ XY = np.asarray(XY) XY.shape = (2,) Points = self.CompPoints(XY, L) FC.Polygon.__init__(self, Points, LineColor = "Black", LineStyle = "Solid", LineWidth = 2, FillColor = "Red", FillStyle = "Solid") ## Override the default OutlinePoints def GetOutlinePoints(self): return self.Points def CompPoints(self, XY, L): c = L/ np.sqrt(3) Points = np.array(((0, c), ( L/2.0, -c/2.0), (-L/2.0, -c/2.0)), np.float64) Points += XY return Points class DrawFrame(wx.Frame): """ A simple frame used for the Demo """ def __init__(self, *args, **kwargs): wx.Frame.__init__(self, *args, **kwargs) self.CreateStatusBar() # Add the Canvas Canvas = NavCanvas.NavCanvas(self,-1,(500,500), ProjectionFun = None, Debug = 0, BackgroundColor = "DARK SLATE BLUE", ).Canvas self.Canvas = Canvas Canvas.Bind(FC.EVT_MOTION, self.OnMove ) Canvas.Bind(FC.EVT_LEFT_UP, self.OnLeftUp ) Points = np.array(((0,0), (1,0), (0.5, 1)), float) data = (( (0,0), 1), ( (3,3), 2), ( (-2,3), 2.5 ), ) for p, L in data: Tri = TriangleShape1(p, 1) Canvas.AddObject(Tri) Tri.Bind(FC.EVT_FC_LEFT_DOWN, self.ObjectHit) Circle = MovingCircle( (1, 3), 2, FillColor="Blue") Canvas.AddObject(Circle) Circle.Bind(FC.EVT_FC_LEFT_DOWN, self.ObjectHit) Bitmaps = [] ## create the bitmaps first for Point in ((1,1), (-4,3)): Bitmaps.append(MovingBitmap(Resources.getMondrianImage(), Point, Height=1, Position='cc') ) Line = ConnectorLine(Bitmaps[0], Bitmaps[1], LineWidth=3, LineColor="Red") Canvas.AddObject(Line) ## then add them to the Canvas, so they are on top of the line for bmp in Bitmaps: Canvas.AddObject(bmp) bmp.Bind(FC.EVT_FC_LEFT_DOWN, self.ObjectHit) A = MovingArc((-5, 0),(-2, 2),(-5, 2), LineColor="Red", LineWidth=2) self.Canvas.AddObject(A) A.Bind(FC.EVT_FC_LEFT_DOWN, self.ObjectHit) self.Show(True) self.Canvas.ZoomToBB() self.MoveObject = None self.Moving = False return None def ObjectHit(self, object): if not self.Moving: self.Moving = True self.StartPoint = object.HitCoordsPixel self.StartObject = self.Canvas.WorldToPixel(object.GetOutlinePoints()) self.MoveObject = None self.MovingObject = object def OnMove(self, event): """ Updates the status bar with the world coordinates and moves the object it is clicked on """ self.SetStatusText("%.4f, %.4f"%tuple(event.Coords)) if self.Moving: dxy = event.GetPosition() - self.StartPoint # Draw the Moving Object: dc = wx.ClientDC(self.Canvas) dc.SetPen(wx.Pen('WHITE', 2, wx.SHORT_DASH)) dc.SetBrush(wx.TRANSPARENT_BRUSH) dc.SetLogicalFunction(wx.XOR) if self.MoveObject is not None: dc.DrawPolygon(self.MoveObject) self.MoveObject = self.StartObject + dxy dc.DrawPolygon(self.MoveObject) def OnLeftUp(self, event): if self.Moving: self.Moving = False if self.MoveObject is not None: dxy = event.GetPosition() - self.StartPoint dxy = self.Canvas.ScalePixelToWorld(dxy) self.MovingObject.Move(dxy) self.MoveTri = None self.Canvas.Draw(True) if __name__ == "__main__": app = wx.App(0) DrawFrame(None, -1, "FloatCanvas Moving Object App", wx.DefaultPosition, (700,700) ) app.MainLoop()