B-7-4

import pyxel


class LineDrawingApp:
    def __init__(self):
        pyxel.init(200, 200)
        pyxel.mouse(visible=True)


        self.lines = []
        self.dragging = False
        self.start_pos = (0, 0)  
        self.space_key_pressed = 0


        pyxel.run(self.update, self.draw)


    def update(self):
        if pyxel.btnp(pyxel.KEY_SPACE):
            if self.dragging:
                self.lines.append((self.start_pos, (pyxel.mouse_x, pyxel.mouse_y)))
                self.dragging = False
            else:
                self.start_pos = (pyxel.mouse_x, pyxel.mouse_y)
                self.dragging = True


            self.space_key_pressed += 1


            if self.space_key_pressed % 2 == 1:
                self.lines = []


    def draw(self):
        pyxel.cls(0)

        
        for line in self.lines:
            pyxel.line(line[0][0], line[0][1], line[1][0], line[1][1], 7)


        if self.dragging:
            pyxel.line(self.start_pos[0], self.start_pos[1], pyxel.mouse_x, pyxel.mouse_y, 7)


if __name__ == "__main__":
    LineDrawingApp()