Mercurial > MadButterfly
view src/geo.c @ 1223:ec964cf4c993
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author | Thinker K.F. Li <thinker@codemud.net> |
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date | Thu, 06 Jan 2011 09:39:47 +0800 |
parents | 586e50f82c1f |
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// -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*- // vim: sw=4:ts=8:sts=4 /*! \brief Determine who should be re-drawed. * \file * When part of graphic are chagned, not mater size, shape, or position, * the components effected or overlaid should be re-drawed. This module * figures out components that should be re-drawed. */ #include <stdio.h> #include <string.h> #include "mb_types.h" static int is_scale_overlay(co_aix x1, co_aix w1, co_aix x2, co_aix w2) { if(x1 > x2) { if((x1 - x2) >= w2) return 0; } else { if((x2 - x1) >= w1) return 0; } return 1; } static int _areas_are_overlay(area_t *r1, area_t *r2) { if(is_scale_overlay(r1->x, r1->w, r2->x, r2->w) && is_scale_overlay(r1->y, r1->h, r2->y, r2->h)) return 1; return 0; } int areas_are_overlay(area_t *r1, area_t *r2) { return _areas_are_overlay(r1, r2); } void area_init(area_t *area, int n_pos, co_aix pos[][2]) { co_aix min_x, max_x; co_aix min_y, max_y; co_aix x, y; int i; /*! \note {x=0, y=0, w=0, h=0} geometry value for a n_pos=0 request * can prevent cursor flasing for Cairo XLib. * (see changeset 21db69d46835) */ if(n_pos == 0) { area->x = 0; area->w = 0; area->y = 0; area->h = 0; return; } min_x = max_x = pos[0][0]; min_y = max_y = pos[0][1]; for(i = 1; i < n_pos; i++) { x = pos[i][0]; if(x < min_x) min_x = x; else if(x > max_x) max_x = x; y = pos[i][1]; if(y < min_y) min_y = y; else if(y > max_y) max_y = y; } area->x = min_x; area->w = max_x - min_x + 1; area->y = min_y; area->h = max_y - min_y + 1; } void geo_init(geo_t *g) { memset(g, 0, sizeof(geo_t)); g->cur_area = g->areas; g->last_area = g->areas + 1; } void geo_from_positions(geo_t *g, int n_pos, co_aix pos[][2]) { area_init(g->cur_area, n_pos, pos); } void geo_mark_overlay(geo_t *g, int n_others, geo_t **others, int *n_overlays, geo_t **overlays) { int i, ov_idx; ov_idx = 0; for(i = 0; i < n_others; i++) { if(_areas_are_overlay(g->cur_area, others[i]->cur_area)) overlays[ov_idx++] = others[i]; } *n_overlays = ov_idx; } #ifdef UNITTEST #include <CUnit/Basic.h> void test_geo_from_positions(void) { co_aix data[][2] = { {33, 25}, {49, 12}, {14, 28}, {39, 56}}; geo_t g; geo_init(&g); geo_from_positions(&g, 4, data); CU_ASSERT(g.cur_area->x == 14); CU_ASSERT(g.cur_area->w == 36); CU_ASSERT(g.cur_area->y == 12); CU_ASSERT(g.cur_area->h == 45); } void test_geo_mark_overlay(void) { geo_t _geos[3], *geos[3], *overlays[3]; geo_t g; co_aix pos[2][2]; int i, n_ov; for(i = 0; i < 3; i++) { pos[0][0] = i * 50; pos[0][1] = i * 50; pos[1][0] = i * 50 + 55; pos[1][1] = i * 50 + 66; geo_init(_geos + i); geo_from_positions(_geos + i, 2, pos); geos[i] = _geos + i; } pos[0][0] = 88; pos[0][1] = 79; pos[1][0] = 88 + 70; pos[1][1] = 79 + 70; geo_init(&g); geo_from_positions(&g, 2, pos); /* overlay with geos[1] and geos[2] */ geo_mark_overlay(&g, 3, geos, &n_ov, overlays); CU_ASSERT(n_ov == 2); CU_ASSERT(overlays[0] == geos[1]); CU_ASSERT(overlays[1] == geos[2]); /* right side of geos[1], and up side of geos[2] */ pos[0][0] = 106; pos[0][1] = 51; pos[1][0] = 106 + 49; pos[1][1] = 51 + 49; geo_from_positions(&g, 2, pos); geo_mark_overlay(&g, 3, geos, &n_ov, overlays); CU_ASSERT(n_ov == 1); CU_ASSERT(overlays[0] == geos[2]); } CU_pSuite get_geo_suite(void) { CU_pSuite suite; suite = CU_add_suite("Suite_geo", NULL, NULL); CU_ADD_TEST(suite, test_geo_from_positions); CU_ADD_TEST(suite, test_geo_mark_overlay); return suite; } #endif