diff options
Diffstat (limited to 'src/libs/graphics/boxint.c')
| -rw-r--r-- | src/libs/graphics/boxint.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/libs/graphics/boxint.c b/src/libs/graphics/boxint.c new file mode 100644 index 0000000..0500311 --- /dev/null +++ b/src/libs/graphics/boxint.c @@ -0,0 +1,183 @@ +//Copyright Paul Reiche, Fred Ford. 1992-2002 + +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include "gfxintrn.h" + +#undef MIN +#define MIN(a, b) (((a) <= (b)) ? (a) : (b)) +#undef MAX +#define MAX(a, b) (((a) >= (b)) ? (a) : (b)) + +INTERSECT_CODE +BoxIntersect (RECT *pr1, RECT *pr2, RECT *pinter) +{ + INTERSECT_CODE intersect_code; + COORD x1; + SIZE w1, w2, delta; + + intersect_code = INTERSECT_NOCLIP; + + x1 = pr1->corner.x - pr2->corner.x; + + w1 = pr1->extent.width; + w2 = pr2->extent.width; + if ((delta = w2 - x1) <= w1) + { + if (delta != w1) + { + w1 = delta; + intersect_code &= ~INTERSECT_NOCLIP; + } + intersect_code |= INTERSECT_RIGHT; + } + if (x1 <= 0) + { + if (x1 < 0) + { + w1 += x1; + x1 = 0; + intersect_code &= ~INTERSECT_NOCLIP; + } + intersect_code |= INTERSECT_LEFT; + } + + if (w1 > 0) + { +#define h2 w2 + COORD y1; + SIZE h1; + + y1 = pr1->corner.y - pr2->corner.y; + + h1 = pr1->extent.height; + h2 = pr2->extent.height; + if ((delta = h2 - y1) <= h1) + { + if (delta != h1) + { + h1 = delta; + intersect_code &= ~INTERSECT_NOCLIP; + } + intersect_code |= INTERSECT_BOTTOM; + } + if (y1 <= 0) + { + if (y1 < 0) + { + h1 += y1; + y1 = 0; + intersect_code &= ~INTERSECT_NOCLIP; + } + intersect_code |= INTERSECT_TOP; + } + + if (h1 > 0) + { + pinter->corner.x = x1 + pr2->corner.x; + pinter->corner.y = y1 + pr2->corner.y; + pinter->extent.width = w1; + pinter->extent.height = h1; + + return (intersect_code); + } +#undef h2 + } + + return ((INTERSECT_CODE)0); +} + +void +BoxUnion (RECT *pr1, RECT *pr2, RECT *punion) +{ +#if NEVER // Part of lower FIXME. + COORD x2, y2, w2, h2; +#endif // NEVER + + // Union is A AND B, put together, correct? Returns a bigger box that + // encompasses the two. + punion->corner.x = MIN(pr1->corner.x, pr2->corner.x); + punion->corner.y = MIN(pr1->corner.y, pr2->corner.y); + + punion->extent.width = MAX(pr1->corner.x + pr1->extent.width, + pr2->corner.x + pr2->extent.width) - punion->corner.x; + punion->extent.height = MAX(pr1->corner.y + pr1->extent.height, + pr2->corner.y + pr2->extent.height) - punion->corner.y; + + +#if NEVER // FIXME - I think this is broken, but keeping it around for reference + // FIXME - just in case. + +#if 1 /* alter based on 0 widths */ + + x2 = + (pr1->corner.x < pr2->corner.x)? pr1->corner.x : pr2->corner.x; + + y2 = + (pr1->corner.y < pr2->corner.y)? pr1->corner.y : pr2->corner.y; + + w2 = ( + ((pr1->corner.x + pr1->extent.width) > (pr2->corner.x + pr2->extent.width))? + (pr1->corner.x + pr1->extent.width) : (pr2->corner.x + pr2->extent.width) + ) - punion->corner.x; + + h2 = ( + ((pr1->corner.y + pr1->extent.height) > (pr2->corner.y + pr2->extent.height))? + (pr1->corner.y + pr1->extent.height) : (pr2->corner.y + pr2->extent.height) + ) - punion->corner.y; +#else + SIZE delta; + COORD x1, y1, w1, h1; + + x1 = pr1->corner.x; + w1 = pr1->extent.width; + x2 = pr2->corner.x; + w2 = pr2->extent.width; + if ((delta = x1 - x2) >= 0) + w1 += delta; + else + { + w2 -= delta; + x2 += delta; + } + + y1 = pr1->corner.y; + h1 = pr1->extent.height; + y2 = pr2->corner.y; + h2 = pr2->extent.height; + if ((delta = y1 - y2) >= 0) + h1 += delta; + else + { + h2 -= delta; + y2 += delta; + } + + if ((delta = w1 - w2) > 0) + w2 += delta; + if ((delta = h1 - h2) > 0) + h2 += delta; +#endif + + punion->corner.x = x2; + punion->corner.y = y2; + punion->extent.width = w2; + punion->extent.height = h2; + +#endif // NEVER +} + |