[019]Arrow/DoubleArrow

Arrow

arrow = Arrow()

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Arrow: draw arrow between two points

        arrow = Arrow(DOWN, UP)

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Arrow: buff, scale

class Arrow_Buff(Scene):
    def construct(self):       
        buff_changed = Arrow_Buff.get_buff_changed()
        scale_changed = Arrow_Buff.get_scale_changed()
    
        buff_changed.to_corner(UL, buff=1)
        buff_changed.arrange(DOWN, center=False, aligned_edge=LEFT)

        scale_changed.to_edge(UP, buff=1)
        scale_changed.arrange(DOWN, center=False, aligned_edge=LEFT)

        #3. Show
        self.add(buff_changed, scale_changed)
        self.wait()

    def get_scale_changed():       
        n=np.arange(0,2.1,0.2) 

        group = VGroup()
        for k in n:
            k = round(k,1) 
            arrow = Arrow()
            arrow.scale(k) 
            text = Text("scale:"+str(k),size=0.2,stroke_width=0) 

            text.next_to(arrow,RIGHT) 
            group.add(VGroup(arrow,text))  
        return group

    def get_buff_changed():
        buff_size = [0,SMALL_BUFF,MED_SMALL_BUFF,MED_LARGE_BUFF]
        texts = ["0","SMALL_BUFF","MED_SMALL_BUFF","MED_LARGE_BUFF"]

        group = VGroup()
        for t, s in zip(texts,buff_size):
            arrow = Arrow(buff=s)
            text = Text(t, size=0.2, stroke_width=0)

            text.next_to(arrow,RIGHT)
            group.add(VGroup(arrow,text))
        return group

---

Arrow: tip_length

class Arrow_TipLength(Scene):
    def construct(self):
        size = np.arange(0,0.41,0.05)

        g = VGroup()
        for s in size:
            s = round(s,2)
            arrow = Arrow(tip_length=s)
            text = Text("tip_length="+str(s), size=0.3, stroke_width=0)
            text.next_to(arrow,RIGHT)
            g.add(VGroup(arrow,text))

        g.to_edge(UP,buff=1)
        g.arrange(DOWN, aligned_edge=LEFT)

        self.add(g)
        self.wait()

---

Arrow.tip

arrow = Arrow()
    arrow.tip.scale(0.75)   
    arrow.tip.set_stroke(WHITE, width=5) 
    arrow.tip.set_fill(opacity=0)   

 

---

DoubleArrow

	d_arrow = DoubleArrow(LEFT, RIGHT)
	d_arrow.set_length(5)