# # File: # ndc_grid.py # # Synopsis: # Illustrates how to draw primitives and text using NDC coordinates. # # Categories: # polygons # polylines # polymarkers # text # # Author: # Mary Haley # # Date of initial publication: # April 2008 # # Description: # This example shows how to draw primitives and text using # NDC coordinates. The draw_ndc_grid function is used as # a tool to help determine which coordinates to use. # Effects illustrated: # o Drawing NDC primitives. # o Setting resources for primitives. # o Using the NDC grid routine for debugging purposes. # o Drawing primitives with missing values # o Using indexed color. # # Output: # A single visualization with an NDC grid and primitives is produced. # # Notes: # # # Import NumPy, Ngl functions # from __future__ import print_function import numpy, Ngl # Import masked arrays from numpy import ma # # Draw some curves, with and without missing values, and include # some markers and text as references. # def draw_lines(): mkres = Ngl.Resources() # Marker resources lnres = Ngl.Resources() # Line resources xline = Ngl.fspan(0.15,0.85,80) yline1 = 0.025 * (numpy.cos(2.*PI*(Ngl.fspan(1,80,80)/20.))) + 0.9 yline2 = 0.045 * (numpy.sin(2.*PI*(Ngl.fspan(1,80,80)/20.))) + 0.8 yline3 = 0.045 * (numpy.sin(2.*PI*(Ngl.fspan(1,80,80)/10.))) + 0.7 # Draw 3 sets of lines. lnres.gsLineColor = "forestgreen" # Black is the default lnres.gsLineThicknessF = 4.0 # 1.0 is the default Ngl.polyline_ndc(wks,xline,yline1,lnres) lnres.gsLineColor = "brown4" lnres.gsLineThicknessF = 3.0 lnres.gsLineDashPattern = 2 # Default is a solid line (0) Ngl.polyline_ndc(wks,xline,yline2,lnres) lnres.gsLineColor = "NavyBlue" lnres.gsLineThicknessF = 2.0 lnres.gsLineDashPattern = 11 Ngl.polyline_ndc(wks,xline,yline3,lnres) # Draw markers at the end of each of the 3 lines. mkres.gsMarkerColor = "ForestGreen" mkres.gsMarkerIndex = 6 mkres.gsMarkerSizeF = 0.02 Ngl.polymarker_ndc(wks,[xline[0],xline[-1]],[yline1[0],yline1[-1]],mkres) mkres.gsMarkerColor = "brown4" mkres.gsMarkerIndex = 11 Ngl.polymarker_ndc(wks,[xline[0],xline[-1]],[yline2[0],yline2[-1]],mkres) mkres.gsMarkerColor = "NavyBlue" mkres.gsMarkerIndex = 16 mkres.gsMarkerSizeF = 0.01 Ngl.polymarker_ndc(wks,[xline[0],xline[-1]],[yline3[0],yline3[-1]],mkres) # # Draw a vertical line with some missing values. Include markers # so you can see where the missing values were. # lnres.gsLineColor = "blue4" lnres.gsLineThicknessF = 1.5 lnres.gsLineDashPattern = 0 vxline = ma.array(yline2[25::3] - .65) vyline = ma.array( xline[25::3] - .30) # # Draw the markers for each point. # mkres.gsMarkerColor = "mediumorchid4" mkres.gsMarkerIndex = 12 # Stars mkres.gsMarkerThicknessF = 2.0 # Default is 1.0 Ngl.polymarker_ndc(wks,vxline,vyline,mkres) # # Make vxline a masked array and set some values to missing # using the "mask" array. Note that if there's a single point # surrounded by missing values, it will become a marker when # drawn with Ngl.polyline_ndc. # vxline = ma.array(vxline,mask=[0,1,0,1,0,0,0,0,0,1,1,0,0,1,0,0,0,1,0]) Ngl.polyline_ndc(wks,vxline,vyline,lnres) # # Draw a text string describing the above line. # tres = Ngl.Resources() tres.txAngleF = -90. tres.txFontHeightF = 0.03 tres.txJust = "CenterCenter" Ngl.text_ndc(wks,"Line with msg vals",0.23,0.31,tres) # # Put a box around the missing value curve. # bres = Ngl.Resources() bres.gsLineColor = "lightsalmon4" bres.gsLineThicknessF = 3.0 Ngl.polyline_ndc(wks,[.09,.28,.28,.09,.09],[.04,.04,.57,.57,.04],bres) # # Draw some polygons, filled and shaded. # def draw_gons(xshift=0.0,yshift=0.0): gnres = Ngl.Resources() # Polygon resources # The filled diamond gnres.gsFillColor = "lightpink1" xdia = numpy.array([0.00,0.10,0.20,0.10,0.00]) + xshift ydia = numpy.array([0.10,0.00,0.10,0.20,0.10]) + yshift Ngl.polygon_ndc(wks,xdia,ydia,gnres) # The filled four squares gnres.gsFillColor = "lightslateblue" xbox = numpy.array([0.00,0.05,0.05,0.00,0.00]) + xshift ybox = numpy.array([0.00,0.00,0.05,0.05,0.00]) + yshift Ngl.polygon_ndc(wks,xbox, ybox, gnres) Ngl.polygon_ndc(wks,xbox+0.15,ybox, gnres) Ngl.polygon_ndc(wks,xbox, ybox+0.15,gnres) Ngl.polygon_ndc(wks,xbox+0.15,ybox+0.15,gnres) Ngl.polyline_ndc(wks,xbox, ybox) Ngl.polyline_ndc(wks,xbox+0.15,ybox) Ngl.polyline_ndc(wks,xbox, ybox+0.15) Ngl.polyline_ndc(wks,xbox+0.15,ybox+0.15) # The shaded slanted boxes attaching the squares gnres.gsFillColor = "cyan" xbt1 = numpy.array([0.05,0.10,0.10,0.05,0.05]) + xshift ybt1 = numpy.array([0.00,0.05,0.10,0.05,0.00]) + yshift xbt2 = ybt1 ybt2 = xbt1 xbt3 = xbt1 + .05 ybt3 = ybt1 + .10 xbt4 = ybt3 ybt4 = xbt3 gnres.gsFillColor = "black" gnres.gsFillIndex = 17 Ngl.polygon_ndc(wks,xbt1,ybt1,gnres) Ngl.polygon_ndc(wks,xbt2,ybt2,gnres) Ngl.polygon_ndc(wks,xbt3,ybt3,gnres) Ngl.polygon_ndc(wks,xbt4,ybt4,gnres) Ngl.polyline_ndc(wks,xbt1,ybt1,gnres) Ngl.polyline_ndc(wks,xbt2,ybt2,gnres) Ngl.polyline_ndc(wks,xbt3,ybt3,gnres) Ngl.polyline_ndc(wks,xbt4,ybt4,gnres) xtb1 = numpy.array([0.10,0.15,0.15,0.10,0.10]) + xshift ytb1 = numpy.array([0.05,0.00,0.05,0.10,0.05]) + yshift xtb2 = ytb1 ytb2 = xtb1 xtb3 = xtb1 - .05 ytb3 = ytb1 + .10 xtb4 = ytb3 ytb4 = xtb3 Ngl.polygon_ndc(wks,xtb1,ytb1,gnres) Ngl.polygon_ndc(wks,xtb2,ytb2,gnres) Ngl.polygon_ndc(wks,xtb3,ytb3,gnres) Ngl.polygon_ndc(wks,xtb4,ytb4,gnres) Ngl.polyline_ndc(wks,xtb1,ytb1,gnres) Ngl.polyline_ndc(wks,xtb2,ytb2,gnres) Ngl.polyline_ndc(wks,xtb3,ytb3,gnres) Ngl.polyline_ndc(wks,xtb4,ytb4,gnres) # # Draw some text showing how to change the justication # and direction. # def draw_text(): txres = Ngl.Resources() # Text resources mkres = Ngl.Resources() # Marker resources txres.txFontHeightF = 0.03 txres.txFontColor = "black" txres.txPerimOn = True txres.txBackgroundFillColor = "yellow" mkres.gsMarkerIndex = 5 # "X" mkres.gsMarkerSizeF = 0.01 mkres.gsMarkerThicknessF = 2.5 mkres.gsMarkerColor = "red" txres.txJust = "BottomCenter" Ngl.text_ndc(wks,"_{}_".format(txres.txJust),0.6,0.3,txres) Ngl.polymarker_ndc(wks,0.6,0.3,mkres) txres.txJust = "TopLeft" Ngl.text_ndc(wks,"_{}_".format(txres.txJust),0.6,0.25,txres) Ngl.polymarker_ndc(wks,0.6,0.25,mkres) txres.txJust = "CenterRight" Ngl.text_ndc(wks,"_{}_".format(txres.txJust),0.6,0.15,txres) Ngl.polymarker_ndc(wks,0.6,0.15,mkres) txres.txJust = "TopCenter" txres.txDirection = "Down" Ngl.text_ndc(wks,txres.txJust,0.85,0.5,txres) Ngl.polymarker_ndc(wks,0.85,0.5,mkres) # # Main code # PI = 3.14159 # # Send graphics PNG file. # wks_type = "png" wks = Ngl.open_wks(wks_type,"ndc_grid") # Comment this out to get rid of the gray NDC grid. Ngl.draw_ndc_grid(wks) draw_lines() draw_gons(xshift=0.4,yshift=0.4) draw_text() Ngl.frame(wks) Ngl.end()