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Last change on this file since 109 was 109, checked in by pinsard, 18 years ago
modification of savesaxo.sh to fix ticket 17
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683	<a href="imoms3.html"><<prev file</a> \| <a href="inrecgrid.html">next file >></a>    <a href="inquad.html" 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>
684
685	</div>
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687
688	<div id="container">
689
690	<h1 class="directory"><a href="directory-overview.html?format=raw">Interpolation/</a></h1>
691	<h2 class="pro_file">inquad.pro</h2>
692
693	<div id="file_attr">
694	<dl>
695	</dl>
696	</div>
697
698	<div id="file_comments"> to find if an (x,y) point is in a quadrilateral (x1,x2,x3,x4)
699	</div>
700
701
702
703
704
705
706
707
708
709	<div id="routine_details">
710
711
712	<div class="routine_details" id="_inquad">
713
714	<h2><a class="top" href="#container">top</a>inquad <span class="categories"> grid manipulation
715	</span></h2>
716
717	<p class="header">
718	<span class="result">result = </span>inquad(<span class="result"><a href="#_inquad_param_x">x</a>, <a href="#_inquad_param_y">y</a>, <a href="#_inquad_param_x1">x1</a>, <a href="#_inquad_param_y1">y1</a>, <a href="#_inquad_param_x2">x2</a>, <a href="#_inquad_param_y2">y2</a>, <a href="#_inquad_param_x3">x3</a>, <a href="#_inquad_param_y3">y3</a>, <a href="#_inquad_param_x4">x4</a>, <a href="#_inquad_param_y4">y4</a></span>, <a href="#_inquad_keyword_ONSPHERE">ONSPHERE</a>=<span class="result">ONSPHERE</span>, <a href="#_inquad_keyword_DOUBLE">DOUBLE</a>=<span class="result">DOUBLE</span>, <a href="#_inquad_keyword_ZOOMRADIUS">ZOOMRADIUS</a>=<span class="result">ZOOMRADIUS</span>, <a href="#_inquad_keyword_NOPRINT">NOPRINT</a>=<span class="result">NOPRINT</span>, <a href="#_inquad_keyword_NEWCOORD">NEWCOORD</a>=<span class="result">NEWCOORD</span>)</p>
719
720	<div class="comments"></div>
721
722	<h3>Return value</h3><div class="value">
723	a n element vector. Where n is the number of elements of
724	x. res[i]=j means that the point number i is located in the
725	quadrilateral number j with (0 <= j <= n_elements(x0)-1)
726	</div>
727
728
729	<h3>Parameters</h3>
730
731
732	<h4 id="_inquad_param_x">x
733	<span class="attr">in</span>
734
735
736	<span class="attr">required</span>
737
738
739
740
741	</h4>
742
743	<div class="comments"> the coordinates of the point we want to know where it
744	is. Must be a scalar if /onsphere activated else can be scalar
745	or array.
746	</div>
747
748	<h4 id="_inquad_param_y">y
749
750
751
752
753
754
755
756
757	</h4>
758
759	<div class="comments"></div>
760
761	<h4 id="_inquad_param_x1">x1
762	<span class="attr">in</span>
763
764
765	<span class="attr">required</span>
766
767
768
769
770	</h4>
771
772	<div class="comments"> the coordinates of the
773	quadrilateral given in the CLOCKWISE order. Scalar or array.
774
775	</div>
776
777	<h4 id="_inquad_param_y1">y1
778
779
780
781
782
783
784
785
786	</h4>
787
788	<div class="comments"></div>
789
790	<h4 id="_inquad_param_x2">x2
791
792
793
794
795
796
797
798
799	</h4>
800
801	<div class="comments"></div>
802
803	<h4 id="_inquad_param_y2">y2
804
805
806
807
808
809
810
811
812	</h4>
813
814	<div class="comments"></div>
815
816	<h4 id="_inquad_param_x3">x3
817
818
819
820
821
822
823
824
825	</h4>
826
827	<div class="comments"></div>
828
829	<h4 id="_inquad_param_y3">y3
830
831
832
833
834
835
836
837
838	</h4>
839
840	<div class="comments"></div>
841
842	<h4 id="_inquad_param_x4">x4
843
844
845
846
847
848
849
850
851	</h4>
852
853	<div class="comments"></div>
854
855	<h4 id="_inquad_param_y4">y4
856
857
858
859
860
861
862
863
864	</h4>
865
866	<div class="comments"></div>
867
868
869
870
871
872
873	<h3>Keywords</h3>
874
875	<h4 id="_inquad_keyword_ONSPHERE">ONSPHERE
876
877
878
879
880
881
882
883
884	</h4>
885
886	<div class="comments"> to specify that the quadilateral are on a sphere and
887	that teir coordinates are longitude-latitude coordinates. In this
888	case, est-west periodicity, poles singularity and other pbs
889	related to longitude-latitude coordinates are managed
890	automatically.
891	</div>
892
893	<h4 id="_inquad_keyword_DOUBLE">DOUBLE
894
895
896
897
898
899
900
901
902	</h4>
903
904	<div class="comments"> use double precision to perform the computation
905	</div>
906
907	<h4 id="_inquad_keyword_ZOOMRADIUS">ZOOMRADIUS
908
909
910
911
912
913
914
915
916	</h4>
917
918	<div class="comments"> :the zoom (circle centred on the (x,y) with a radius of
919	zoomradius degree where we look for the the quadrilateral which; contains the (x,y) point) used for the satellite projection
920	when /onsphere is activated. Default is 4 and seems to be the
921	minimum which can be used. Can be increase if the cell size is
922	larger than 5 degrees.
923	</div>
924
925	<h4 id="_inquad_keyword_NOPRINT">NOPRINT
926
927
928
929
930
931
932
933
934	</h4>
935
936	<div class="comments"> to suppress the print messages.
937	</div>
938
939	<h4 id="_inquad_keyword_NEWCOORD">NEWCOORD
940
941
942
943
944
945
946
947
948	</h4>
949
950	<div class="comments"></div>
951
952
953
954	<h3>Examples</h3><div class="value">
955
956	res = inquad(x, y, x1, y1, x2, y2, x3, y3, x4, y4)
957
958
959
960	x = 1.*[1, 2, 6, 7, 3]
961	y = 1.*[1, 3, 3, 4, 7]
962	x1 = 1.*[0,4,2]
963	y1 = 1.*[1,4,8]
964	x2 = 1.*[1,6,4]
965	y2 = 1.*[5,6,8]
966	x3 = 1.*[3,8,4]
967	y3 = 1.*[4,4,6]
968	x4 = 1.*[2,6,2]
969	y4 = 1.*[0,2,6]
970	splot, [0,10], [0,10], xstyle = 1, ystyle = 1,/nodata
971	for i=0,2 do oplot, [x4[i],x1[i],x2[i],x3[i],x4[i]],[y4[i],y1[i],y2[i],y3[i],y4[i]]
972	oplot, x, y, color = 20, psym = 1, thick = 2
973	print, inquad(x, y, x1, y1, x2, y2, x3, y3, x4, y4)
974
975	On a sphere see clickincell.pro...
976	</div>
977	<h3>Version history</h3>
978
979
980	<h4>History</h4><div class="value">
981	Sebastien Masson (smasson@lodyc.jussieu.fr)
982	August 2003
983	Based on Convert_clic_ij.pro written by Gurvan Madec
984	</div>
985
986
987	<h3>Known issues</h3>
988
989
990
991	<h4>Restrictions</h4><div class="value"> I think degenerated quadrilateral (e.g. flat of
992	twisted) is not work. This has to be tested.
993	</div>
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005	</div>
1006
1007	</div>
1008
1009
1010
1011	<div id="tagline">Produced by IDLdoc 2.0.</div>
1012
1013	</div>
1014
1015	</body>
1016	</html>

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