import sys from kivy.uix.widget import Widget from kivy.core.window import Window from point import Point # cross painter class Cross_painter(Widget): def __init__(self,app,**kwargs): # list of crosses self.crosses=[] # cross under mouse self.undermouse=None # list of selected crosses self.selected=[] # app is used to share information between widgets self.app=app # modifiers self.modifiers=[] # init Widget super(Cross_painter,self).__init__(**kwargs) # init keyboard self.keyboard = Window.request_keyboard(None,self,"text") self.keyboard.bind(on_key_down=self.on_key_down,on_key_up=self.on_key_up) def reset(self): self.crosses=[] self.undermouse=None self.draw() # draw all crosses def draw(self): self.canvas.clear() with self.canvas: for cross in self.crosses: cross.draw() # respond to keyboard def on_key_down(self, keyboard, keycode, text, modifiers): # check that command_prompt is not focused if not self.app.command_prompt.insert: if keycode[1]=="shift": if not 's' in self.modifiers: self.modifiers.append('s') self.modifiers.sort() def on_key_up(self, keyboard, keycode): if keycode[1]=="shift": if 's' in self.modifiers: # remove self.modifiers[self.modifiers.index('s')]=self.modifiers[len(self.modifiers)-1] self.modifiers=self.modifiers[:len(self.modifiers)-1] self.modifiers.sort() # respond to mouse down def on_touch_down(self,touch): # only respond to touch in area if self.collide_point(*touch.pos): # create new cross if touch.button=="right": if self.check_interaction_any(Point(touch.x/Cross.size,touch.y/Cross.size),None): new=Cross(touch.x/Cross.size,touch.y/Cross.size) # add to list self.crosses.append(new) # unselect all crosses for sel in self.selected: sel.selected=False self.selected=[] self.draw() # select cross if touch.button=="left": # find cross under touch self.undermouse=self.find_cross(Point(touch.x/Cross.size,touch.y/Cross.size)) # no modifiers if self.modifiers==[]: if self.undermouse==None or not self.undermouse in self.selected: # unselect all crosses for sel in self.selected: sel.selected=False self.selected=[] # shift-click elif self.modifiers==['s']: if self.undermouse!=None: if self.undermouse not in self.selected: self.selected.append(self.undermouse) self.undermouse.selected=True else: # remove self.selected[self.selected.index(self.undermouse)]=self.selected[len(self.selected)-1] self.selected=self.selected[:len(self.selected)-1] self.undermouse.selected=False self.draw() # respond to drag def on_touch_move(self,touch): if self.collide_point(*touch.pos): # only move on left click if touch.button=="left" and self.modifiers==[] and self.undermouse!=None: # single cross if not self.undermouse in self.selected: self.undermouse.pos=self.check_move(Point(touch.x/Cross.size,touch.y/Cross.size),self.undermouse) # multiple crosses else: self.group_move(touch) # redraw self.draw() # move all selected crosses def group_move(self,touch): # save position of undermouse (to use it after it has been reset) relative_position=self.undermouse.pos # determine order in which to move # direction of motion direction=Point(touch.x/Cross.size,touch.y/Cross.size)-self.undermouse.pos # sort according to scalar product with direction self.selected.sort(key=(lambda cross: direction.dot(cross.pos-self.undermouse.pos)),reverse=True) # move for cross in self.selected: cross.pos=self.check_move(Point(touch.x/Cross.size-relative_position.x+cross.pos.x,touch.y/Cross.size-relative_position.y+cross.pos.y),cross) ## new position of undermouse #self.undermouse.pos=self.check_move(Point(touch.x/Cross.size,touch.y/Cross.size),self.undermouse) ## move other crosses by the same amount as undermouse #for cross in self.selected: # if cross!=self.undermouse: # cross.pos=self.check_move(Point(self.undermouse.pos.x-relative_position.x+cross.pos.x,self.undermouse.pos.y-relative_position.y+cross.pos.y),cross) # #for cross in self.selected: # cross.pos=self.check_move(Point(touch.x/Cross.size-relative_position.x+cross.pos.x,touch.y/Cross.size-relative_position.y+cross.pos.y),cross) # find the cross at position pos def find_cross(self,pos): for cross in self.crosses: if cross_distx(pos,cross.pos)<=0.5 or cross_disty(pos,cross.pos)<=0.5: return cross # none found return None # check whether a position intersects with any of the crosses def check_interaction_any(self,pos,exception): for other in self.crosses: if other!=exception: if other.check_interaction(pos)==False: return False return True # check that a cross can move to new position def check_move(self,newpos,cross): # whether newpos is acceptable accept_newpos=True for other in self.crosses: # do not compare a cross to itself if other!=cross: # move would make cross overlap with other if other.check_interaction(newpos)==False: accept_newpos=False # check if cross touches other if other.check_touch(cross.pos): # move along other while remaining stuck candidate=other.move_along(newpos,cross.pos) else: candidate=other.move_on_line_to_stick(cross.pos,newpos-cross.pos) if self.check_interaction_any(candidate,cross): return candidate if accept_newpos: return newpos else: # cannot move cross at all, try again return self.check_move(candidate,cross) # write configuration to file def write(self,file): ff=open(file,"w") for cross in self.crosses: ff.write("{:05.2f},{:05.2f};{:3.1f},{:3.1f},{:3.1f}\n".format(cross.pos.x,cross.pos.y,cross.color[0],cross.color[1],cross.color[2])) ff.close() # read configuration from file def read(self,file): self.reset() try: ff=open(file,"r") except: self.app.command_prompt.message="error: could not read file '"+file+"' (this should not happen and is probably a bug)" return # counter i=0 try: lines=ff.readlines() except: self.app.command_prompt.message="error: could not read the contents of file '"+file+"'" return for line in lines: i+=1 # remove newline line=line[:len(line)-1] # ignore comments if '#' in line: line=line[:line.find('#')] # ignore empty lines if len(line)==0: continue entries=line.split(";") # skip line if improperly formatted if len(entries)>2: print("warning: ignoring line "+str(i)+" in file '"+file+"': more than two ';' spearated entries in '"+line+"'",file=sys.stderr) continue # position pos_str=entries[0].split(",") # skip line if improperly formatted if len(pos_str)!=2: print("warning: ignoring line "+str(i)+" in file '"+file+"': position '"+entries[0]+"' does not have two components",file=sys.stderr) continue try: pos=Point(float(pos_str[0]),float(pos_str[1])) except: print("warning: ignoring line "+str(i)+" in file '"+file+"': position '"+entries[0]+"' cannot be read",file=sys.stderr) continue # color color=(0,0,1) if len(entries)==2: color_str=entries[1].split(",") # skip line if improperly formatted if len(color_str)!=3: print("warning: ignoring line "+str(i)+" in file '"+file+"': color '"+entries[1]+"' does not have three components",file=sys.stderr) continue try: color=(float(color_str[0]),float(color_str[1]),float(color_str[2])) except: print("warning: ignoring line "+str(i)+" in file '"+file+"': color '"+entries[1]+"' cannot be read",file=sys.stderr) continue if self.check_interaction_any(pos,None): # add to list self.crosses.append(Cross(pos.x,pos.y,color=color)) else: print("warning: ignoring line "+str(i)+" in file '"+file+"': particle overlaps with existing particles",file=sys.stderr) ff.close() self.draw()