vent_DXF/drawer/FanLocalDrawer.py

import math

import ezdxf

import core


class FanLocalDrawer:
    def __init__(self, msp, layer, gap, center, route):
        self.msp = msp
        self.gap = gap
        self.center = center
        self.route = route
        self.layer = layer
    # a2
    # ___a3
    # |
    # a1


    def draw_fan_local(self):
        rad = 0.5 * self.gap


        self.msp.add_circle(center=self.center, radius=rad, dxfattribs={"layer": f"图层{self.layer}"})
        a1 = self.center[0], self.center[1] + rad
        a2 = self.center[0], self.center[1] + rad * 3 / 2
        a3 = self.center[0] + rad * 1 / 2, self.center[1] + rad * 3 / 2




        a1 = core.rotate_point_around_another(a1, self.center, self.route)
        a2 = core.rotate_point_around_another(a2, self.center, self.route)
        a3 = core.rotate_point_around_another(a3, self.center, self.route)

        self.msp.add_line(a1, a2, dxfattribs={"layer": f"图层{self.layer}"})
        self.msp.add_line(a2, a3, dxfattribs={"layer": f"图层{self.layer}"})


        a4 = core.rotate_point_around_another(a1, self.center, -2/3*math.pi)
        a5 = core.rotate_point_around_another(a2, self.center, -2/3*math.pi)
        a6 = core.rotate_point_around_another(a3, self.center, -2/3*math.pi)

        self.msp.add_line(a4, a5, dxfattribs={"layer": f"图层{self.layer}"})
        self.msp.add_line(a5, a6, dxfattribs={"layer": f"图层{self.layer}"})


        a7 = core.rotate_point_around_another(a1, self.center, 2/3*math.pi)
        a8 = core.rotate_point_around_another(a2, self.center, 2/3*math.pi)
        a9 = core.rotate_point_around_another(a3, self.center, 2/3*math.pi)

        self.msp.add_line(a7, a8, dxfattribs={"layer": f"图层{self.layer}"})
        self.msp.add_line(a8, a9, dxfattribs={"layer": f"图层{self.layer}"})


doc = ezdxf.new("R2013")

msp = doc.modelspace()

fl =  FanLocalDrawer(msp,1,5,(90,80),1.114514)

fl.draw_fan_local()

doc.saveas("123.dxf")