Example 1 - XY plots

http://www.ncl.ucar.edu/Document/Manuals/Getting_Started/Examples/gsun01n.shtml

Output from example 1

Frame 1	Frame 2	Frame 3	Frame 4	Frame 5

(Click on any frame to see it enlarged.)

NCL code for example 1

  1. load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"  ; 加载包含gsn_的函数的ncl文件
  3. begin                                                     ;程序开始
  4.   x = new(9,float)  ; 定义一个包含有9个元素的一维数组（c = new((/5,6,7/),integer) a= (/True,False,True/)）
  5.   y = new(9,float)
  6.
  7.   x = (/10.,20.,30.,40.,50.,60.,70.,80.,90./)
  8.   y = (/0.,0.71,1.,0.7,0.002,-0.71,-1.,-0.71,-0.003/)
  9.
 10.   wks = gsn_open_wks("x11","gsun01n")  ; 打开一个X11的工作站
 11.
 12.   plot = gsn_xy(wks,x,y,False)         ; 绘制一个xy的曲线图
 13.
 14. ;----------- Begin second plot -----------------------------------------
 15.
 16.    y2 = (/(/0., 0.7, 1., 0.7, 0., -0.7, -1., -0.7, 0./), 17.          (/2., 2.7, 3., 2.7, 2.,  1.3,  1.,  1.3, 2./), 18.          (/4., 4.7, 5., 4.7, 4.,  3.3,  3.,  3.3, 4./)/)    ;这是一个27个元素的一维数组
 19.
 20.   [email protected]_name  = "X"             ; 定义x的一个属性
 21.   [email protected]_name = "Y"             ; 定义y2的一个属性
 22.
 23.   plot = gsn_xy(wks,x,y2,False)  ; 绘制一个包含3个曲线的xy plot
 24.
 25. ;----------- Begin third plot -----------------------------------------
 26.
 27.   resources                    = True          ; 示意有资源要设置
 29.
 30.   [email protected]xyLineColors        = (/2,3,4/)    ; 设定线条颜色
 31.   [email protected]xyLineThicknesses   = (/1.,2.,5./) ; 设定线条粗细
 32.                                                ; (默认值是1.0).
 33.
 34.   plot = gsn_xy(wks,x,y2,resources)            ; 绘制一个 XY plot.
 35.
 36. ;---------- Begin fourth plot ------------------------------------------
 37.
 38.   [email protected]tiMainString    = "X-Y plot"  ; 标题
 39.   [email protected]tiXAxisString   = "X Axis"    ; x轴标签
 40.   [email protected]tiYAxisString   = "Y Axis"    ; y轴标签
 41.   [email protected]tiMainFont      = "Helvetica" ; 标题字体
 42.   [email protected]tiXAxisFont     = "Helvetica" ; x轴标签字体
 43.   [email protected]tiYAxisFont     = "Helvetica" ; y轴标签字体
 44.
 45.   [email protected]xyMarkLineModes = (/"Lines","Markers","MarkLines"/)
 46.   [email protected]xyMarkers       = (/0,1,3/)   ; (none, dot, asterisk)
 47.   [email protected]xyMarkerColor   = 3           ; 标记颜色
 48.   [email protected]xyMarkerSizeF   = 0.03        ; 标记大小
 49.                                           ; 默认是0.01
 50.
 51.   plot = gsn_xy(wks,x,y2,resources)       ; 绘制一个 XY plot.
 52.
 53. ;---------- Begin fifth plot ------------------------------------------
 54.
 55.   filename = "$NCARG_ROOT/lib/ncarg/data/asc/xy.asc"
 56.
 57.   data = asciiread(filename,(/129,4/),"float")  ;以浮点读取参数文件入data，data数组规格：（/129,4/）
 58.
 59.   uv      = new((/2,129/),float)
 60.   uv(0,:) = data(:,1)
 61.   uv(1,:) = data(:,2)
 62.
 63.   lon     = data(:,0)
 64.   lon     = (lon-1) * 360./128.
 65.
 66.   delete(resources) ; 删除之前设置的资源
 67.
 68.   resources                        = True
 69.
 70.   [email protected]tiMainString           = "U/V components of wind"
 71.   [email protected]tiXAxisString          = "longitude"
 72.   [email protected]tiYAxisString          = "m/s"
 73.   [email protected]tiXAxisFontHeightF     = 0.02        ; 改变字体大小
 74.   [email protected]tiYAxisFontHeightF     = 0.02
 75.
 76.   [email protected]xyLineColors           = (/3,4/)     ; 设置线条颜色
 77.   [email protected]xyLineThicknessF       = 2.0         ; 线条粗细设置为原来2倍
 78.
 79.   [email protected]xyLabelMode            = "Custom"    ; 设置曲线标签
 80.   [email protected]xyExplicitLabels       = (/"U","V"/) ; 曲线标签
 81.   [email protected]xyLineLabelFontHeightF = 0.02        ; 大小和颜色
 82.   [email protected]xyLineLabelFontColor   = 2           ; 线条标签
 83.
 84.   plot = gsn_xy(wks,lon,uv,resources) ; 绘制2个曲线的xy plot
 85.
 86.   delete(plot)       ; 清空绘制面板
 87.   delete(resources)  ; 删除资源
 88. end