How do you make a line with an arrow halfway between 2 points?
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i'm looking for something like. [p1] ------>-----[p2]
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jonas
2018-7-10
编辑:jonas
2018-7-10
Let's say you want an arrow from between [X1 X2],[Y1 Y2]. We use annotation but specify the arrow coordinates by the axes coordinates (instead of the default figure coordinates)
x=0:.05:2*pi;
y=sin(x);
h=plot(x,y)
X=[0 4]; %[X1 X2]
Y=[0.5 -0.5]; %[Y1 Y2]
Pos=get(gca,'position');
xlimits=get(gca,'xlim');
xmin=xlimits(1);
xmax=xlimits(2);
AxesRangeX=diff(xlimits)
FigPosX=Pos(1)+(X-xmin)*(Pos(3)/AxesRangeX)
ylimits=get(gca,'ylim');
ymin=ylimits(1);
ymax=ylimits(2);
AxesRangeY=diff(ylimits)
FigPosY=Pos(2)+(Y-ymin)*(Pos(4)/AxesRangeY)
dX=diff(FigPosX);
dY=diff(FigPosY);
annotation('arrow',FigPosX,FigPosY,'headstyle','none')
annotation('arrow',FigPosX-[0 dX./2],FigPosY-[0 dY./2])
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