如何在 IDL 中构建垂直填充图

 IDL包含一个名为FILLPLOT的例程，可用于创建水平填充图，但不支持垂直填充图。构建垂直填充图的最简便方法是改用POLYGON例程。以下代码示例展示了如何使用POLYGON例程构建垂直填充图。

PRO TEST_VERTICAL_FILLED_PLOT


; create X data as Mineral %

x=[1,5,2,3,4,5,6,6,2,0,0,0,2,3,4,5,4,3,1,2]

; create Y data as Depth

y=INDGEN(20)


; retrieve X and Y minimum and maximum values

xpmin=min(x)

xpmax=max(x)

ypmin=min(y)

ypmax=max(y)


; dsiplay data, with increasing depth from top to bottom of Y axis

g = PLOT(x, y, YTITLE='Depth',XRANGE=[xpmin,xpmax],YRANGE=[ypmax,ypmin])

g['axis0'].SHOWTEXT =0

g['axis2']. TITLE='Mineral %'

g['axis2'].SHOWTEXT =1



; build the polygon by adding  the points: 
; [ xpmin, ypmax] , [ xpmin, ypmin]  and [ x[0], y[0]] to the input data to close the polygon along the vertical Y axis

xExt = [ x, xpmin, xpmin, x[0]]

yExt = [ y, ypmax, ypmin, y[0]]


; draw the polygon

pol = POLYGON(xExt, yExt, /DATA, FILL_BACKGROUND=1, FILL_COLOR='Yellow',TARGET=g2)


END

将生成类似于以下内容的图形：