If you don't call GSFAIS before calling GFA, as shown in the fcirc example, your polygons or areas will not be filled-in other words, they will be filled with nothing. Notice that "hollow fill" is the default GKS fill style. X(N), Y(N) Real arrays, Input-The X and Y world coordinates of the polygon to be filled. N Integer, Input-The number of points in the polygon to be filled. GSFAIS sets the style or type of fill to be used, and GFA fills an area defined in world coordinates.Īreas filled using GKS Code segment from fcirc.f 1 CALL GSFAIS (MOD (ICOLOR, 4))Īrguments ISTYLE Integer, Input-The style of fill to be used in subsequent calls to GFA.Ģ Pattern fill: not implemented in NCAR Graphics GKS. This module describes the two calls you must make to fill an area using GKS calls. SFGETP Retrieves the dot pattern parameter.įor a more complete description of Softfill parameters, see the softfill_params man page or the Softfill programmer document.ĬH CHaracter selector Integer or Character Softfill parameter routines SFSETC Sets character parameters. SFSGFA Fills a polygon defined in world coordinates with solid color fill (if available on your graphics device) otherwise it uses a suitable pattern fill. SFWRLD Fills a polygon defined in world coordinates with evenly spaced parallel lines or with rectangular patterns of dots or characters. Softfill fill routines SFNORM Fills a polygon defined in NDCs with evenly spaced parallel lines or with rectangular patterns of dots or characters. GFA Fills the specified polygon with the fill style set by the last call to GSFAIS. GKS fill routines GSFAIS Establishes the interior fill style to be used in subsequent calls to GFA. This module organizes the GKS area-filling routines and all Softfill routines according to their functions. Table of user entry points for area filling However, the Softfill utility gives you much more flexibility and many more fill options than GKS. The simplest is to use GKS calls directly to fill an area. NCAR Graphics provides two methods for filling areas. \ and \ Thus, they are not the same and we should be careful while writing these.Chapter 13: Area filling with GKS and Softfill Chapter 13: Area filling with GKS and Softfill Previous chapter LLUs Home Next chapter Index Now, we will consider triangles ABC and CAD.įrom the above triangles, we can say that, Any two given triangles are said to be similar if the ratio of the corresponding sides of both triangles is the same or the corresponding angles are the same. (i) In this part, we have to prove that triangles ABC and CAD are similar. Now, we will solve both parts separately. To solve the second part, we will find the length of BC by making use of the fact that in two similar triangles, the ratio of corresponding sides remains the same.īefore we solve the given question, we must know that a trapezium is a polygon in which one pair of the opposite sides are parallel and the other pair is non-parallel. Thus, they will be similar by the SAS criterion. Then, to prove the two given triangles as similar, we will prove that the ratio of two corresponding sides are the same and the angle included between these sides in both the triangles are the same. Hint: To solve the given question, we will first find out what a trapezium is.
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