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authorFederico Mena Quintero <federico@src.gnome.org>2000-03-06 07:44:52 +0800
committerFederico Mena Quintero <federico@src.gnome.org>2000-03-06 07:44:52 +0800
commit70108e31eafba17f63a04375d7e4c51c7d1c35eb (patch)
tree5f2d784d69deb42cb830f20702fb6a76628f925b /calendar/layout.c
parent3de981ec78d529eb1bd9b2f98f154eae91dffc6d (diff)
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More file moving action - Federico
svn path=/trunk/; revision=2061
Diffstat (limited to 'calendar/layout.c')
-rw-r--r--calendar/layout.c288
1 files changed, 0 insertions, 288 deletions
diff --git a/calendar/layout.c b/calendar/layout.c
deleted file mode 100644
index 4195c464ae..0000000000
--- a/calendar/layout.c
+++ /dev/null
@@ -1,288 +0,0 @@
-/* Event layout engine for Gnomecal
- *
- * Copyright (C) 1998 The Free Software Foundation
- *
- * Authors: Miguel de Icaza <miguel@nuclecu.unam.mx>
- * Federico Mena <federico@nuclecu.unam.mx>
- */
-
-#include <config.h>
-#include <stdlib.h>
-#include "layout.h"
-
-
-/* This structure is used to pass around layout information among the internal layout functions */
-struct layout_info {
- GList *events; /* List of events from client */
- int num_events; /* The number of events (length of the list) */
- LayoutQueryTimeFunc func; /* Function to convert a list item to a start/end time pair */
- int num_rows; /* Size of the time partition */
- time_t *partition; /* The time partition containing start and end time values */
- int *array; /* Working array of free and allocated time slots */
- int *allocations; /* Returned array of slot allocations */
- int *slots; /* Returned array of slots used */
- int num_slots; /* Number of slots used */
-};
-
-
-/* This defines the maximum number of events to overlap per row. More than that number of events
- * will not be displayed. This is not ideal, so sue me.
- */
-#define MAX_EVENTS_PER_ROW 32
-
-
-/* Compares two time_t values, used for qsort() */
-static int
-compare_time_t (const void *a, const void *b)
-{
- time_t ta, tb;
-
- ta = *((time_t *) a);
- tb = *((time_t *) b);
-
- if (ta < tb)
- return -1;
- else if (ta > tb)
- return 1;
- else
- return 0;
-}
-
-/* Builds a partition of the time range occupied by the events in the list. It returns an array
- * with the times that define the partition and the number of items in the partition.
- */
-static void
-build_partition (struct layout_info *li)
-{
- time_t *rows, *p, *q;
- GList *list;
- int i, unique_vals;
-
- /* This is the maximum number of rows we would need */
-
- li->num_rows = li->num_events * 2;
-
- /* Fill the rows with the times */
-
- rows = g_new (time_t, li->num_rows);
-
- for (list = li->events, p = rows; list; list = list->next) {
- (* li->func) (list, &p[0], &p[1]);
- p += 2;
- }
-
- /* Do a sort | uniq on the array */
-
- qsort (rows, li->num_rows, sizeof (time_t), compare_time_t);
-
- p = rows;
- q = rows + 1;
- unique_vals = 1;
-
- for (i = 1; i < li->num_rows; i++, q++)
- if (*q != *p) {
- unique_vals++;
- p++;
- *p = *q;
- }
-
- /* Return the number of unique values in the partition and the partition array itself */
-
- li->num_rows = unique_vals;
- li->partition = rows;
-}
-
-/* Returns the index of the element in the partition that corresponds to the specified time */
-static int
-find_index (struct layout_info *li, time_t t)
-{
- int i;
-
- for (i = 0; ; i++)
- if (li->partition[i] == t)
- return i;
-
- g_assert_not_reached ();
-}
-
-#define xy(li, x, y) li->array[(y * MAX_EVENTS_PER_ROW) + (x)]
-
-/* Checks that all the cells in the slot array at the specified slot column are free to use by an
- * event that has the specified range.
- */
-static int
-range_is_empty (struct layout_info *li, int slot, time_t start, time_t end)
-{
- int i;
-
- for (i = find_index (li, start); li->partition[i] < end; i++)
- if (xy (li, slot, i) != -1)
- return FALSE;
-
- return TRUE;
-}
-
-/* Allocates a time in the slot array for the specified event's index */
-static void
-range_allocate (struct layout_info *li, int slot, time_t start, time_t end, int ev_num)
-{
- int i;
-
- for (i = find_index (li, start); li->partition[i] < end; i++)
- xy (li, slot, i) = ev_num;
-}
-
-/* Performs the initial allocation of slots for events. Each event gets one column; they will be
- * expanded in a later stage. Returns the number of columns used.
- */
-static void
-initial_allocate (struct layout_info *li)
-{
- GList *events;
- int i;
- int slot;
- int num_slots;
- time_t start, end;
-
- num_slots = 0;
-
- for (i = 0, events = li->events; events; events = events->next, i++) {
- (* li->func) (events, &start, &end);
-
- /* Start with no allocation, no columns */
-
- li->allocations[i] = -1;
- li->slots[i] = 0;
-
- /* Find a free column for the event */
-
- for (slot = 0; slot < MAX_EVENTS_PER_ROW; slot++)
- if (range_is_empty (li, slot, start, end)) {
- range_allocate (li, slot, start, end, i);
-
- li->allocations[i] = slot;
- li->slots[i] = 1;
-
- if ((slot + 1) > num_slots)
- num_slots = slot + 1;
-
- break;
- }
- }
-
- li->num_slots = num_slots;
-}
-
-/* Returns the maximum number of columns that an event can expanded by in the slot array */
-static int
-columns_to_expand (struct layout_info *li, int ev_num, time_t start, time_t end)
-{
- int cols;
- int slot;
- int i_start;
- int i;
-
- cols = 0;
-
- i_start = find_index (li, start);
-
- for (slot = li->allocations[ev_num] + 1; slot < li->num_slots; slot++) {
- for (i = i_start; li->partition[i] < end; i++)
- if (xy (li, slot, i) != -1)
- return cols;
-
- cols++;
- }
-
- return cols;
-}
-
-/* Expands an event by the specified number of columns */
-static void
-do_expansion (struct layout_info *li, int ev_num, time_t start, time_t end, int num_cols)
-{
- int i, j;
- int slot;
-
- for (i = find_index (li, start); li->partition[i] < end; i++) {
- slot = li->allocations[ev_num] + 1;
-
- for (j = 0; j < num_cols; j++)
- xy (li, slot + j, i) = ev_num;
- }
-}
-
-/* Expands the events in the slot array to occupy as many columns as possible. This is the second
- * pass of the layout algorithm.
- */
-static void
-expand_events (struct layout_info *li)
-{
- GList *events;
- time_t start, end;
- int i;
- int cols;
-
- for (i = 0, events = li->events; events; events = events->next, i++) {
- (* li->func) (events, &start, &end);
-
- cols = columns_to_expand (li, i, start, end);
-
- if (cols == 0)
- continue; /* We can't expand this event */
-
- do_expansion (li, i, start, end, cols);
-
- li->slots[i] += cols;
- }
-}
-
-void
-layout_events (GList *events, LayoutQueryTimeFunc func, int *num_slots, int **allocations, int **slots)
-{
- struct layout_info li;
- int i;
-
- g_return_if_fail (num_slots != NULL);
- g_return_if_fail (allocations != NULL);
- g_return_if_fail (slots != NULL);
-
- if (!events) {
- *num_slots = 0;
- *allocations = NULL;
- *slots = NULL;
-
- return;
- }
-
- li.events = events;
- li.num_events = g_list_length (events);
- li.func = func;
-
- /* Build the partition of the time range, and then build the array of slots */
-
- build_partition (&li);
-
- li.array = g_new (int, li.num_rows * MAX_EVENTS_PER_ROW);
- for (i = 0; i < (li.num_rows * MAX_EVENTS_PER_ROW); i++)
- li.array[i] = -1; /* This is our 'empty' value */
-
- /* Build the arrays for allocations and columns used */
-
- li.allocations = g_new (int, li.num_events);
- li.slots = g_new (int, li.num_events);
-
- /* Perform initial allocation and then expand the events to as many slots as they can occupy */
-
- initial_allocate (&li);
- expand_events (&li);
-
- /* Clean up and return values */
-
- g_free (li.partition);
- g_free (li.array);
-
- *num_slots = li.num_slots;
- *allocations = li.allocations;
- *slots = li.slots;
-}