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--- haas:spring2016:cprog:projects:cos0 [2016/03/07 17:13] – [Prerequisites/Corequisites] wedge
+++ haas:spring2016:cprog:projects:cos0 [2016/03/07 17:30] (current) – [Program] wedge
@@ Line 15: / Line 15: @@
   * can algorithmically generate a circle of points (x, y coordinate pairs)
-  * obtain image width, height from command-line
+  * can obtain information from the command-line (argc/argv)
-  * obtain radius from command-line
+  * can call functions from a library (gd).
-  * obtain center x, y from command-line
 =====Background=====
 We've spent our time so far this semester covering the basic concepts of programming, in C. Variables, selection statements, iteration, functions, structs, etc.
@@ Line 36: / Line 34: @@
   * uses the gd image library (libgd)
-  * image is at least 800x600 (can be larger, but not huge, don't go beyond 1280x1024)
+  * reads the following information from the command-line (lacking this information should result in an error):
-    * image resolution must not be square (i.e. **NOT** 800x800, 1000x1000, etc.)
+    * *(argv+1): image width (in pixels, ranging from 800-1280)
+    * *(argv+2): image height (in pixels, ranging from 600-1024)
+    * *(argv+3): circle radius (in pixels, should not exceed half of the smaller of width, height)
+    * *(argv+4): center x of circle (a value of 0 should result in auto-centering of x with respect to width)
+    * *(argv+5): center y of circle (a value of 0 should result in auto-centering of y with respect to height)
+    * *(argv+6), if present, will be the name of the output image file produced. If it is absent, assume the default name **cos0.png**.
+  * image width, height is at least 800x600 (can be larger, but not huge, don't go beyond 1280x1024)-- and specified on the command-line when running the program
+    * if the information isn't supplied, display an error and exit with non-zero status
+    * image resolution must not be square (i.e. **NOT** 800x800, 1000x1000, etc.)-- if it is, display an error and exit with non-zero status
   * image has a black background
   * image has an outer border of a color other than black and the circle (unless circle is multiple colors, then the border could be one of the contained colors).
   * draws a circle out of squares
-    * circle must be at least 1 color (that isn't the same as the background), but bonus consideration would be given for the following:
+    * circle must be at least 1 color (that isn't the same as the background), but bonus consideration would be given for any of the following:
       * multi-colored (think gradient) circle
       * multiple circles (concentric?)
@@ Line 50: / Line 56: @@
 ====getting started====
-You may make use of the following skeleton program to assist you in doing this project:
+You may make use of the following skeleton program to assist you in doing this project.
+Note that this code is not in conformance with project specifications, but is provided to give you a starting place for modifications and additions:
 <code c>
 /*
- * PROGRAM.c  - skeleton code to use the GD graphics library to create
+ * PROGRAM.c  - skeleton code to use the GD graphics library
- *              an image.
+ *              to create an image.
  *
  * To compile:  gcc -o PROGRAM PROGRAM.c -lgd

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