porting agg_basics

agg/agg_basics.java

@@ -0,0 +1,150 @@
+package agg;
+
+
+public class agg_basics {
+
+  /*
+    typedef unsigned char cover_type;    //----cover_type
+    enum cover_scale_e
+    {
+        cover_shift = 8,                 //----cover_shift
+        cover_size  = 1 << cover_shift,  //----cover_size
+        cover_mask  = cover_size - 1,    //----cover_mask
+        cover_none  = 0,                 //----cover_none
+        cover_full  = cover_mask         //----cover_full
+    };
+  */
+  public static final int cover_shift = 8;
+  public static final int cover_size  = 1 << cover_shift;
+  public static final int cover_mask  = cover_size - 1;
+  public static final int cover_none  = 0;
+  public static final int cover_full  = cover_mask;
+
+  /*
+  const double pi = 3.14159265358979323846;
+
+  inline double deg2rad(double deg)
+  {
+    return deg * pi / 180.0;
+  }
+
+  inline double rad2deg(double rad)
+  {
+    return rad * 180.0 / pi;
+  }
+  */
+
+  public static final int path_cmd_stop     = 0;
+  public static final int path_cmd_move_to  = 1;
+  public static final int path_cmd_line_to  = 2;
+  public static final int path_cmd_curve3   = 3;
+  public static final int path_cmd_curve4   = 4;
+  public static final int path_cmd_curveN   = 5;
+  public static final int path_cmd_catrom   = 6;
+  public static final int path_cmd_ubspline = 7;
+  public static final int path_cmd_end_poly = 0x0F;
+  public static final int path_cmd_mask     = 0x0F;
+
+  public static final int path_flags_none  = 0;
+  public static final int path_flags_ccw   = 0x10;
+  public static final int path_flags_cw    = 0x20;
+  public static final int path_flags_close = 0x40;
+  public static final int path_flags_mask  = 0xF0;
+
+
+  final static public boolean is_vertex(unsigned c) {
+    return c >= path_cmd_move_to && c < path_cmd_end_poly;
+  }
+
+
+  final static public boolean is_drawing(unsigned c) {
+    return c >= path_cmd_line_to && c < path_cmd_end_poly;
+  }
+
+
+  final static public boolean is_stop(unsigned c) {
+    return c == path_cmd_stop;
+  }
+
+
+  final static public boolean is_move_to(unsigned c) {
+    return c == path_cmd_move_to;
+  }
+
+
+  final static public boolean is_line_to(unsigned c) {
+    return c == path_cmd_line_to;
+  }
+
+
+  final static public boolean is_curve(unsigned c) {
+    return c == path_cmd_curve3 || c == path_cmd_curve4;
+  }
+
+
+  final static public boolean is_curve3(unsigned c) {
+    return c == path_cmd_curve3;
+  }
+
+
+  final static public boolean is_curve4(unsigned c) {
+    return c == path_cmd_curve4;
+  }
+
+
+  final static public boolean is_end_poly(unsigned c) {
+    return (c & path_cmd_mask) == path_cmd_end_poly;
+  }
+
+
+  final static public boolean is_close(int c) {  // un
+    return (c & ~(path_flags_cw | path_flags_ccw)) ==
+      (path_cmd_end_poly | path_flags_close);
+  }
+
+
+  final static public boolean is_next_poly(int c) {  // un
+    return is_stop(c) || is_move_to(c) || is_end_poly(c);
+  }
+
+
+  final static public boolean is_cw(int c) {  // un
+    return (c & path_flags_cw) != 0;
+  }
+
+
+  final static public boolean is_ccw(int c) {  // un
+    return (c & path_flags_ccw) != 0;
+  }
+
+
+  final static public boolean is_oriented(int c) {  // un
+    return (c & (path_flags_cw | path_flags_ccw)) != 0;
+  }
+
+
+  final static public boolean is_closed(int c) {  // un
+    return (c & path_flags_close) != 0;
+  }
+
+
+  final static public int get_close_flag(int c) {  // un
+    return c & path_flags_close;
+  }
+
+
+  final static public int clear_orientation(int c) {  // un
+    return c & ~(path_flags_cw | path_flags_ccw);
+  }
+
+
+  final static public int get_orientation(int c) {  // un
+    return c & (path_flags_cw | path_flags_ccw);
+  }
+
+
+  final static public int set_orientation(int c, int o) {  // un
+    return clear_orientation(c) | o;
+  }
+}
+