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665
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686	<< prev file \| <a href="plt.html?format=raw">next file >></a>    <a href="bar_plot.html?format=raw" target="_TOP">view single page</a> \| <a href="./../../../index.html?format=raw" target="_TOP">view frames</a>    summary: fields \| routine    details: <a href="#routine_details">routine</a>
687
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689
690
691	<div id="container">
692
693	<h1 class="directory"><a href="directory-overview.html?format=raw">ToBeReviewed/PLOTS/DESSINE/</a></h1>
694	<h2 class="pro_file">bar_plot.pro</h2>
695
696	<div id="file_attr">
697	<dl>
698	</dl>
699	</div>
700
701	<div id="file_comments">
702	Create a bar graph, or overplot on an existing one.
703	</div>
704
705
706
707
708
709
710
711
712
713	<div id="routine_details">
714
715
716	<div class="routine_details" id="_bar_plot">
717
718	<h2><a class="top" href="#container">top</a>bar_plot <span class="categories">
719	Graphics
720	</span></h2>
721
722	<p class="header">
723	bar_plot<span class="result">, <a href="#_bar_plot_param_values">values</a></span>, <a href="#_bar_plot_keyword_baselines">baselines</a>=<span class="result">baselines</span>, <a href="#_bar_plot_keyword_colors">colors</a>=<span class="result">colors</span>, <a href="#_bar_plot_keyword_barnames">barnames</a>=<span class="result">barnames</span>, <a href="#_bar_plot_keyword_title">title</a>=<span class="result">title</span>, <a href="#_bar_plot_keyword_xtitle">xtitle</a>=<span class="result">xtitle</span>, <a href="#_bar_plot_keyword_ytitle">ytitle</a>=<span class="result">ytitle</span>, <a href="#_bar_plot_keyword_baserange">baserange</a>=<span class="result">baserange</span>, <a href="#_bar_plot_keyword_barwidth">barwidth</a>=<span class="result">barwidth</span>, <a href="#_bar_plot_keyword_barspace">barspace</a>=<span class="result">barspace</span>, <a href="#_bar_plot_keyword_baroffset">baroffset</a>=<span class="result">baroffset</span>, <a href="#_bar_plot_keyword_outline">outline</a>=<span class="result">outline</span>, <a href="#_bar_plot_keyword_overplot">overplot</a>=<span class="result">overplot</span>, <a href="#_bar_plot_keyword_background">background</a>=<span class="result">background</span>, <a href="#_bar_plot_keyword_rotate">rotate</a>=<span class="result">rotate</span>, <a href="#_bar_plot_keyword__EXTRA">_EXTRA</a>=<span class="result">_EXTRA</span></p>
724
725	<div class="comments">
726	</div>
727
728
729
730
731	<h3>Parameters</h3>
732
733
734	<h4 id="_bar_plot_param_values">values
735	<span class="attr">in</span>
736
737
738	<span class="attr">required</span>
739
740
741
742
743	</h4>
744
745	<div class="comments">
746	A vector containing the values to be represented by the bars.
747	Each element in VALUES corresponds to a single bar in the
748	output.
749	</div>
750
751
752
753
754
755
756	<h3>Keywords</h3>
757
758	<h4 id="_bar_plot_keyword_baselines">baselines
759
760
761
762
763
764
765
766
767	</h4>
768
769	<div class="comments">
770	A vector, the same size as VALUES, that contains the
771	base value associated with each bar. If not specified,
772	a base value of zero is used for all bars.
773	</div>
774
775	<h4 id="_bar_plot_keyword_colors">colors
776
777
778
779
780
781
782
783
784	</h4>
785
786	<div class="comments">
787	A vector, the same size as VALUES, containing the color index
788	to be used for each bar. If not specified, the colors are
789	selected based on spacing the color indices as widely as
790	possible within the available colors (specified by D.N_COLORS).
791	</div>
792
793	<h4 id="_bar_plot_keyword_barnames">barnames
794
795
796
797
798
799
800
801
802	</h4>
803
804	<div class="comments">
805	A string array, containing one string label per bar.
806	If the bars are vertical, the labels are placed beneath
807	them. If horizontal (rotated) bars are specified, the labels
808	are placed to the left of the bars.
809	</div>
810
811	<h4 id="_bar_plot_keyword_title">title
812
813
814
815
816
817
818
819
820	</h4>
821
822	<div class="comments">
823	A string containing the main title to for the bar plot.
824	</div>
825
826	<h4 id="_bar_plot_keyword_xtitle">xtitle
827
828
829
830
831
832
833
834
835	</h4>
836
837	<div class="comments">
838	A string containing the title for the X axis.
839	</div>
840
841	<h4 id="_bar_plot_keyword_ytitle">ytitle
842
843
844
845
846
847
848
849
850	</h4>
851
852	<div class="comments">
853	A string containing the title for the Y axis.
854	</div>
855
856	<h4 id="_bar_plot_keyword_baserange">baserange
857
858
859
860
861
862
863
864
865	</h4>
866
867	<div class="comments">
868	A floating-point scalar in the range 0.0 to 1.0, that
869	determines the fraction of the total available plotting area
870	(in the direction perpendicular to the bars) to be used.
871	If not specified, the full available area is used.
872	</div>
873
874	<h4 id="_bar_plot_keyword_barwidth">barwidth
875
876
877
878
879
880
881
882
883	</h4>
884
885	<div class="comments">
886	A floating-point value that specifies the width of the bars
887	in units of "nominal bar width". The nominal bar width is
888	computed so that all the bars (and the space between them,
889	set by default to 20% of the width of the bars) will fill the
890	available space (optionally controlled with the BASERANGE
891	keyword).
892	</div>
893
894	<h4 id="_bar_plot_keyword_barspace">barspace
895
896
897
898
899
900
901
902
903	</h4>
904
905	<div class="comments">
906	A scalar that specifies, in units of "nominal bar width",
907	the spacing between bars. For example, if BARSPACE is 1.0,
908	then all bars will have one bar-width of space between them.
909	If not specified, the bars are spaced apart by 20% of the bar
910	width.
911	</div>
912
913	<h4 id="_bar_plot_keyword_baroffset">baroffset
914
915
916
917
918
919
920
921
922	</h4>
923
924	<div class="comments">
925	A scalar that specifies the offset to be applied to the
926	first bar, in units of "nominal bar width". This keyword
927	allows, for example, different groups of bars to be overplotted
928	on the same graph. If not specified, the default offset is
929	equal to BARSPACE.
930	</div>
931
932	<h4 id="_bar_plot_keyword_outline">outline
933
934
935
936
937
938
939
940
941	</h4>
942
943	<div class="comments">
944	If set, this keyword specifies that an outline should be
945	drawn around each bar.
946	</div>
947
948	<h4 id="_bar_plot_keyword_overplot">overplot
949
950
951
952
953
954
955
956
957	</h4>
958
959	<div class="comments">
960	If set, this keyword specifies that the bar plot should be
961	overplotted on an existing graph.
962	</div>
963
964	<h4 id="_bar_plot_keyword_background">background
965
966
967
968
969
970
971
972
973	</h4>
974
975	<div class="comments">
976	A scalar that specifies the color index to be used for
977	the background color. By default, the normal IDL background
978	color is used.
979	</div>
980
981	<h4 id="_bar_plot_keyword_rotate">rotate
982
983
984
985
986
987
988
989
990	</h4>
991
992	<div class="comments">
993	If set, this keyword indicates that horizontal rather than
994	vertical bars should be drawn. The bases of horizontal bars
995	are on the left, "Y" axis and the bars extend to the right.
996	</div>
997
998	<h4 id="_bar_plot_keyword__EXTRA">_EXTRA
999
1000
1001
1002
1003
1004
1005
1006
1007	</h4>
1008
1009	<div class="comments"></div>
1010
1011
1012
1013	<h3>Examples</h3><div class="preformat"> By using the overplotting capability, it is relatively easy to create
1014	stacked bar charts, or different groups of bars on the same graph.
1015
1016	For example, if ARRAY is a two-dimensional array of 5 columns and 8
1017	rows, it is natural to make a plot with 5 bars, each of which is a
1018	"stacked" composite of 8 sections. First, create a 2D COLORS array,
1019	equal in size to ARRAY, that has identical color index values across
1020	each row to ensure that the same item is represented by the same color
1021	in all bars.
1022
1023	With ARRAYS and COLORS defined, the following code fragment
1024	illustrates the creation of stacked bars (note that the number of rows
1025	and columns is arbitrary):
1026
1027	!Y.RANGE = [0,ymax] ; Scale range to accommodate the total bar lengths.
1028	BASE = INTARR(NROWS)
1029	FOR I = 0, NROWS-1 DO BEGIN
1030	BAR_PLOT, ARRAY(,I), COLORS=COLORS(,I), BASELINES=BASE, $
1031	BARWIDTH=0.75, BARSPACE=0.25, OVER=(I GT 0)
1032	BASE = BASE + ARRAY(*,I)
1033	ENDFOR
1034
1035	To plot each row of ARRAY as a clustered group of bars within the same
1036	graph, use the BASERANGE keyword to restrict the available plotting
1037	region for each set of bars. The sample code fragment below
1038	illustrates this method:
1039
1040	FOR I = 0, NROWS-1 DO $
1041	BAR_PLOT, ARRAY(*,I), COLORS=COLORVECT, BARWIDTH=0.8,BARSPACE=0.2, $
1042	BAROFFSET=I((1.0+BARSPACE)NCOLS), OVER=(I GT 0), BASERANGE=0.19
1043
1044	where NCOLS is the number of columns in ARRAY, and COLORVECT is a
1045	vector containing the color indices to be used for each group of
1046	bars. (In this example, each group uses the same set of colors, but
1047	this could easily be changed.)
1048	</div>
1049	<h3>Version history</h3>
1050
1051
1052	<h4>History</h4><div class="preformat"> August 1990, T.J. Armitage, RSI, initial programming. Replacement
1053	for PLOTBAR and OPLOTBAR routines written by William Thompson.
1054
1055	September 1990, Steve Richards, RSI, changed defaults to improve the
1056	appearance of the bar plots in the default mode. Included
1057	spacing the bars slightly.
1058
1059	$Id: bar_plot.pro 142 2006-07-21 12:47:49Z navarro $
1060	</div>
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079	</div>
1080
1081	</div>
1082
1083
1084
1085	<div id="tagline">Produced by IDLdoc 2.0.</div>
1086
1087	</div>
1088
1089	</body>
1090	</html>

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