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author | rsc <devnull@localhost> | 2003-09-30 17:47:42 +0000 |
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committer | rsc <devnull@localhost> | 2003-09-30 17:47:42 +0000 |
commit | 76193d7cb0457807b2f0b95f909ab5de19480cd7 (patch) | |
tree | 97e538c7e38181431e90289a0fe8b6b7ce1f8f3c /src/libdraw/arith.c | |
parent | ed7c8e8d02c02bdbff1e88a6d8d1419f39af48ad (diff) | |
download | plan9port-76193d7cb0457807b2f0b95f909ab5de19480cd7.tar.gz plan9port-76193d7cb0457807b2f0b95f909ab5de19480cd7.tar.bz2 plan9port-76193d7cb0457807b2f0b95f909ab5de19480cd7.zip |
Initial revision
Diffstat (limited to 'src/libdraw/arith.c')
-rw-r--r-- | src/libdraw/arith.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/src/libdraw/arith.c b/src/libdraw/arith.c new file mode 100644 index 00000000..41b30620 --- /dev/null +++ b/src/libdraw/arith.c @@ -0,0 +1,206 @@ +#include <u.h> +#include <libc.h> +#include <draw.h> + +Point +Pt(int x, int y) +{ + Point p; + + p.x = x; + p.y = y; + return p; +} + +Rectangle +Rect(int x, int y, int bx, int by) +{ + Rectangle r; + + r.min.x = x; + r.min.y = y; + r.max.x = bx; + r.max.y = by; + return r; +} + +Rectangle +Rpt(Point min, Point max) +{ + Rectangle r; + + r.min = min; + r.max = max; + return r; +} + +Point +addpt(Point a, Point b) +{ + a.x += b.x; + a.y += b.y; + return a; +} + +Point +subpt(Point a, Point b) +{ + a.x -= b.x; + a.y -= b.y; + return a; +} + +Rectangle +insetrect(Rectangle r, int n) +{ + r.min.x += n; + r.min.y += n; + r.max.x -= n; + r.max.y -= n; + return r; +} + +Point +divpt(Point a, int b) +{ + a.x /= b; + a.y /= b; + return a; +} + +Point +mulpt(Point a, int b) +{ + a.x *= b; + a.y *= b; + return a; +} + +Rectangle +rectsubpt(Rectangle r, Point p) +{ + r.min.x -= p.x; + r.min.y -= p.y; + r.max.x -= p.x; + r.max.y -= p.y; + return r; +} + +Rectangle +rectaddpt(Rectangle r, Point p) +{ + r.min.x += p.x; + r.min.y += p.y; + r.max.x += p.x; + r.max.y += p.y; + return r; +} + +int +eqpt(Point p, Point q) +{ + return p.x==q.x && p.y==q.y; +} + +int +eqrect(Rectangle r, Rectangle s) +{ + return r.min.x==s.min.x && r.max.x==s.max.x && + r.min.y==s.min.y && r.max.y==s.max.y; +} + +int +rectXrect(Rectangle r, Rectangle s) +{ + return r.min.x<s.max.x && s.min.x<r.max.x && + r.min.y<s.max.y && s.min.y<r.max.y; +} + +int +rectinrect(Rectangle r, Rectangle s) +{ + return s.min.x<=r.min.x && r.max.x<=s.max.x && s.min.y<=r.min.y && r.max.y<=s.max.y; +} + +int +ptinrect(Point p, Rectangle r) +{ + return p.x>=r.min.x && p.x<r.max.x && + p.y>=r.min.y && p.y<r.max.y; +} + +Rectangle +canonrect(Rectangle r) +{ + int t; + if (r.max.x < r.min.x) { + t = r.min.x; + r.min.x = r.max.x; + r.max.x = t; + } + if (r.max.y < r.min.y) { + t = r.min.y; + r.min.y = r.max.y; + r.max.y = t; + } + return r; +} + +void +combinerect(Rectangle *r1, Rectangle r2) +{ + if(r1->min.x > r2.min.x) + r1->min.x = r2.min.x; + if(r1->min.y > r2.min.y) + r1->min.y = r2.min.y; + if(r1->max.x < r2.max.x) + r1->max.x = r2.max.x; + if(r1->max.y < r2.max.y) + r1->max.y = r2.max.y; +} + +u32int +drawld2chan[] = { + GREY1, + GREY2, + GREY4, + CMAP8, +}; + +int log2[] = { -1, 0, 1, -1, 2, -1, -1, -1, 3, -1, -1, -1, -1, -1, -1, -1, 4, -1, -1, -1, -1, -1, -1, -1, 4 /* BUG */, -1, -1, -1, -1, -1, -1, -1, 5 }; + +u32int +setalpha(u32int color, uchar alpha) +{ + int red, green, blue; + + red = (color >> 3*8) & 0xFF; + green = (color >> 2*8) & 0xFF; + blue = (color >> 1*8) & 0xFF; + /* ignore incoming alpha */ + red = (red * alpha)/255; + green = (green * alpha)/255; + blue = (blue * alpha)/255; + return (red<<3*8) | (green<<2*8) | (blue<<1*8) | (alpha<<0*8); +} + +Point ZP; +Rectangle ZR; +int +Rfmt(Fmt *f) +{ + Rectangle r; + + r = va_arg(f->args, Rectangle); + return fmtprint(f, "%P %P", r.min, r.max); +} + +int +Pfmt(Fmt *f) +{ + Point p; + + p = va_arg(f->args, Point); + return fmtprint(f, "[%d %d]", p.x, p.y); +} + |