Image_display/LineDraw.py at master · icbicket/Image_display · GitHub

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import matplotlib.lines as mlines
import matplotlib.pyplot as plt
import numpy as np

class LineDraw(object):

    def __init__(self, axis, epsilon):
        self.axis = axis
        self.epsilon = epsilon
        self.canvas = self.axis.figure.canvas
        self.LineStartx = None
        self.LineStarty = None
        self.LineEndx = None
        self.LineEndy = None
        self.LineCoords = np.empty((2, 2))
        self.line = None
        self.Dragging = False
        self.vertex = 1
        self.width = 1
        self.WidthData = self.WidthDataCoords()

    def ConnectDraw(self):
        print('draw a line!')
        self.cidclick = self.canvas.mpl_connect('button_press_event',
            self.LineStart)
        self.cidmotion = self.canvas.mpl_connect('motion_notify_event',
            self.DrawLine)
        self.cidrelease = self.canvas.mpl_connect('button_release_event',
            self.LineEnd)
        self.ciddraw = self.canvas.mpl_connect('draw_event', self.DrawCanvas)
        #print(self.LineStart)

    def DisconnectDraw(self):
        self.canvas.mpl_disconnect(self.cidclick)
        self.canvas.mpl_disconnect(self.cidrelease)
        self.canvas.mpl_disconnect(self.ciddraw)
        self.canvas.mpl_disconnect(self.cidmotion)

    def ConnectMove(self):
        print('move your line!')
        self.cidendpick = self.canvas.mpl_connect('button_press_event',
            self.MoveLinePress)
        self.cidenddrag = self.canvas.mpl_connect('motion_notify_event',
            self.DrawLine)
        self.cidendrelease = self.canvas.mpl_connect('button_release_event',
            self.MoveLineUpdate)
        self.cidwidth = self.canvas.mpl_connect('scroll_event',
            self.ChangeWidth)
        self.cidenddraw = self.canvas.mpl_connect('draw_event', self.DrawCanvas)

    def DisconnectMove(self):
        self.canvas.mpl_disconnect(self.cidendpick)
        self.canvas.mpl_disconnect(self.cidenddrag)
        self.canvas.mpl_disconnect(self.cidendrelease)
        self.canvas.mpl_disconnect(self.cidenddraw)
        self.canvas.mpl_disconnect(self.cidwidth)

    def LineStart(self, event):
        if plt.get_current_fig_manager().toolbar.mode != '':
            return
        if event.inaxes != self.axis:
            return
        self.LineCoords[0] = [event.xdata, event.ydata]
        self.line = mlines.Line2D(self.LineCoords[:, 0], self.LineCoords[:, 0],
            lw=self.WidthData, c='r', animated=True)
        self.axis.add_line(self.line)
        self.background = self.canvas.copy_from_bbox(self.axis.bbox)

    def LineEnd(self, event):
        if plt.get_current_fig_manager().toolbar.mode != '':
            return
        if event.inaxes != self.axis:
            return
        self.LineCoords[1] = [event.xdata, event.ydata]
        self.CoordTransform = self.axis.transData.inverted()
        self.WidthData = self.WidthDataCoords()
        self.line = mlines.Line2D(self.LineCoords[:, 0], self.LineCoords[:, 1],
            lw=self.WidthData, c='r', marker='o', alpha=0.5, solid_capstyle='butt')
        self.axis.add_line(self.line)
        self.Dragging = True
        self.DisconnectDraw()
        self.ConnectMove()
        plt.draw()

    def DrawLine(self, event):
        if plt.get_current_fig_manager().toolbar.mode != '':
            return
        if event.button != 1:
            return
        if event.inaxes is None:
            return
        if self.vertex == 0:
            x = (event.xdata, self.LineCoords[1, 0])
            y = (event.ydata, self.LineCoords[1, 1])
        elif self.vertex == 1:
            x = (self.LineCoords[0, 0], event.xdata)
            y = (self.LineCoords[0, 1], event.ydata)
        else:
            return
        self.line.set_data(x, y)
        self.canvas.restore_region(self.background)
        self.axis.draw_artist(self.line)
        self.canvas.blit(self.axis.bbox)
        self.canvas.draw()

    def DrawCanvas(self, event):
        if plt.get_current_fig_manager().toolbar.mode != '':
            return
        self.background = self.canvas.copy_from_bbox(self.axis.bbox)
        if self.line is not None:
            self.axis.draw_artist(self.line)
            self.WidthData = self.WidthDataCoords()
            self.line.set_linewidth(self.WidthData)
        self.canvas.blit(self.axis.bbox)
        print('new sketch!')

    def MoveLinePress(self, event):
        if plt.get_current_fig_manager().toolbar.mode != '':
            return
        self.vertex = self.GetPoint(event)
        #print(self.vertex)

    def MoveLineUpdate(self, event):
        if plt.get_current_fig_manager().toolbar.mode != '':
            return
        if self.vertex is not None:
            self.LineCoords[self.vertex] = [event.xdata, event.ydata]
            self.line.set_data(self.LineCoords[:, 0], self.LineCoords[:, 1])
            self.canvas.draw()

    def WidthDataCoords(self):
        diff0 = self.axis.transData.inverted().transform((1,0))
        diff1 = self.axis.transData.inverted().transform((2,0))
        diff = (diff1 - diff0) * self.width
        #print(diff)
        return diff[0]

    def ChangeWidth(self, event):
        if plt.get_current_fig_manager().toolbar.mode != '':
            return
        if event.button == 'up':
            self.width += 1
        elif event.button == 'down' and self.width > 1:
            self.width -= 1
        else:
            return
        self.WidthData = self.WidthDataCoords()
        self.line.set_linewidth(self.WidthData)
        self.canvas.draw()

    def GetPoint(self, event):
        if plt.get_current_fig_manager().toolbar.mode != '':
            return
        delta2 = np.sum((self.LineCoords - [event.xdata, event.ydata])**2, axis = 1)
        index = np.where(delta2 == np.min(delta2))[0]
        if delta2[index] >= self.epsilon**2:
            index = None
        return index