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awesome/widgets/graph.c
Gregor Best 0f2da4b9bf widgets: export extents() function 
This commit adds a function called extents() to widgets. In the case of
a systray, it takes the systray's screen as its argument to correctly
calculate the width. By default, 1 is assumed. For all other widgets,
the argument can be ommitted.
The function doesn't return the geometry as drawn, instead it returns
the geometry the widget _wants_ to be drawn at, for example an imagebox
always has (image width, image height) as the return values even if it's
drawn with a smaller width and height on a smaller wibox.

Signed-off-by: Gregor Best <farhaven@googlemail.com>
Signed-off-by: Julien Danjou <julien@danjou.info>
2009-06-04 17:23:29 +02:00

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/*
* graph.c - a graph widget
*
* Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
* Copyright © 2007-2008 Marco Candrian <mac@calmar.ws>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <math.h>
#include "widget.h"
#include "common/tokenize.h"
typedef enum
{
Bottom_Style = 0,
Top_Style,
Line_Style
} plot_style_t;
/** The plot data structure. */
typedef struct
{
/** Grapht title of the plot sections */
char *title;
/** Represents a full graph */
float max_value;
/** Scale the graph */
bool scale;
/* markers... */
/** Index of current (new) value */
int index;
/** Index of the actual maximum value */
int max_index;
/** Pointer to current maximum value itself */
float current_max;
/** Draw style of according index */
plot_style_t draw_style;
/** Keeps the calculated values (line-length); */
int *lines;
/** Actual values */
float *values;
/** Color of them */
color_t color_start;
/** Color at middle of graph */
color_t pcolor_center;
/** Color at end of graph */
color_t pcolor_end;
/** Create a vertical color gradient */
bool vertical_gradient;
} plot_t;
static void
plot_delete(plot_t *g)
{
p_delete(&g->title);
p_delete(&g->lines);
p_delete(&g->values);
}
DO_ARRAY(plot_t, plot, plot_delete)
/** The private graph data structure */
typedef struct
{
/** Width of the widget */
int width;
/** Height of graph (0.0-1.0; 1.0 = height of bar) */
float height;
/** Height of the innerbox in pixels */
int box_height;
/** Size of lines-array (also innerbox-length) */
int size;
/** Background color */
color_t bg;
/** Border color */
color_t border_color;
/** Grow: Left or Right */
position_t grow;
/** Preparation/tmp array for draw_graph(); */
int *draw_from;
/** Preparation/tmp array for draw_graph(); */
int *draw_to;
/** Graph list */
plot_array_t plots;
} graph_data_t;
/** Add a plot to a graph.
* \param d The graph private data.
* \param title The plot title.
* \return A new plot.
*/
static plot_t *
graph_plot_add(graph_data_t *d, const char *title)
{
plot_t plot;
p_clear(&plot, 1);
plot.title = a_strdup(title);
plot.values = p_new(float, d->size);
plot.lines = p_new(int, d->size);
plot.max_value = 100.0;
plot.vertical_gradient = true;
xcolor_to_color(&globalconf.colors.fg, &plot.color_start);
plot_array_append(&d->plots, plot);
return &d->plots.tab[d->plots.len - 1];
}
/** Get the plot, and create one if it does not exist.
* \param d The graph private data.
* \param title The plot title.
* \return A maybe new plot.
*/
static plot_t *
graph_plot_get(graph_data_t *d, const char *title)
{
plot_t *plot;
/* check if this section is defined already */
for(int j = 0; j < d->plots.len; j++)
{
plot = &d->plots.tab[j];
if(!a_strcmp(title, plot->title))
return plot;
}
/* no plot found -> create one */
return graph_plot_add(d, title);
}
static area_t
graph_geometry(widget_t *widget, screen_t *screen, int height, int width)
{
area_t geometry;
graph_data_t *d = widget->data;
geometry.x = geometry.y = 0;
geometry.height = height;
geometry.width = d->width;
return geometry;
}
static area_t
graph_extents(lua_State *L, widget_t *widget)
{
area_t geometry;
graph_data_t *d = widget->data;
geometry.width = geometry.height = d->width;
return geometry;
}
/** Draw a graph widget.
* \param ctx The draw context.
* \param w The widget node we are called from.
* \param offset The offset to draw at.
* \param used The already used width.
* \param p A pointer to the object we're drawing onto.
* \return The widget width.
*/
static void
graph_draw(widget_t *widget, draw_context_t *ctx,
area_t geometry, wibox_t *p)
{
int margin_top, y;
graph_data_t *d = widget->data;
area_t rectangle;
vector_t color_gradient;
if(!d->plots.len)
return;
/* box = the plot inside the rectangle */
if(!d->box_height)
d->box_height = round(ctx->height * d->height) - 2;
margin_top = round((ctx->height - (d->box_height + 2)) / 2) + geometry.y;
/* draw background */
rectangle.x = geometry.x + 1;
rectangle.y = margin_top + 1;
rectangle.width = d->size;
rectangle.height = d->box_height;
draw_rectangle(ctx, rectangle, 1.0, true, &d->bg);
/* for plot drawing */
rectangle.y = margin_top + d->box_height + 1; /* bottom left corner as starting point */
rectangle.width = d->size; /* rectangle.height is not used */
draw_graph_setup(ctx); /* setup some drawing options */
/* gradient begin either left or on the right of the rectangle */
if(d->grow == Right)
color_gradient.x = rectangle.x + rectangle.width;
else
color_gradient.x = rectangle.x;
for(int i = 0; i < d->plots.len; i++)
{
plot_t *plot = &d->plots.tab[i];
switch(plot->draw_style)
{
case Top_Style:
color_gradient.y = rectangle.y - rectangle.height;
if(plot->vertical_gradient)
{
color_gradient.x_offset = 0;
color_gradient.y_offset = rectangle.height;
}
else
{
color_gradient.y_offset = 0;
if(d->grow == Right)
color_gradient.x_offset = - rectangle.width;
else
color_gradient.x_offset = rectangle.width;
}
for(y = 0; y < d->size; y++)
{
/* reverse values (because drawing from top) */
d->draw_from[y] = d->box_height; /* i.e. no smaller value -> from top of box */
d->draw_to[y] = d->box_height - plot->lines[y]; /* i.e. on full plot -> 0 = bottom */
}
draw_graph(ctx, rectangle , d->draw_from, d->draw_to, plot->index, d->grow, color_gradient,
&plot->color_start, &plot->pcolor_center, &plot->pcolor_end);
break;
case Bottom_Style:
color_gradient.y = rectangle.y;
if(plot->vertical_gradient)
{
color_gradient.x_offset = 0;
color_gradient.y_offset = - rectangle.height;
}
else
{
color_gradient.y_offset = 0;
if(d->grow == Right)
color_gradient.x_offset = - rectangle.width;
else
color_gradient.x_offset = rectangle.width;
}
p_clear(d->draw_from, d->size);
draw_graph(ctx, rectangle, d->draw_from, plot->lines, plot->index, d->grow, color_gradient,
&plot->color_start, &plot->pcolor_center, &plot->pcolor_end);
break;
case Line_Style:
color_gradient.y = rectangle.y;
if(plot->vertical_gradient)
{
color_gradient.x_offset = 0;
color_gradient.y_offset = -rectangle.height;
}
else
{
color_gradient.y_offset = 0;
if(d->grow == Right)
color_gradient.x_offset = - rectangle.width;
else
color_gradient.x_offset = rectangle.width;
}
draw_graph_line(ctx, rectangle, plot->lines, plot->index, d->grow, color_gradient,
&plot->color_start, &plot->pcolor_center, &plot->pcolor_end);
break;
}
}
/* draw border (after line-drawing, what paints 0-values to the border) */
rectangle.x = geometry.x;
rectangle.y = margin_top;
rectangle.width = d->size + 2;
rectangle.height = d->box_height + 2;
draw_rectangle(ctx, rectangle, 1.0, false, &d->border_color);
}
/** Set various plot graph properties.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lvalue A widget.
* \lparam A plot name.
* \lparam A table with various properties set.
*/
static int
luaA_graph_plot_properties_set(lua_State *L)
{
widget_t *widget = luaL_checkudata(L, 1, "widget");
graph_data_t *d = widget->data;
float max_value;
const char *title, *buf;
size_t len;
plot_t *plot = NULL;
color_init_cookie_t reqs[3];
int i, reqs_nbr = -1;
title = luaL_checkstring(L, 2);
luaA_checktable(L, 3);
plot = graph_plot_get(d, title);
if((buf = luaA_getopt_lstring(L, 3, "fg", NULL, &len)))
reqs[++reqs_nbr] = color_init_unchecked(&plot->color_start, buf, len);
if((buf = luaA_getopt_lstring(L, 3, "fg_center", NULL, &len)))
reqs[++reqs_nbr] = color_init_unchecked(&plot->pcolor_center, buf, len);
if((buf = luaA_getopt_lstring(L, 3, "fg_end", NULL, &len)))
reqs[++reqs_nbr] = color_init_unchecked(&plot->pcolor_end, buf, len);
plot->vertical_gradient = luaA_getopt_boolean(L, 3, "vertical_gradient", plot->vertical_gradient);
plot->scale = luaA_getopt_boolean(L, 3, "scale", plot->scale);
max_value = luaA_getopt_number(L, 3, "max_value", plot->max_value);
if(max_value != plot->max_value)
plot->max_value = plot->current_max = max_value;
if((buf = luaA_getopt_lstring(L, 3, "style", NULL, &len)))
switch (a_tokenize(buf, len))
{
case A_TK_BOTTOM:
plot->draw_style = Bottom_Style;
break;
case A_TK_LINE:
plot->draw_style = Line_Style;
break;
case A_TK_TOP:
plot->draw_style = Top_Style;
break;
default:
break;
}
for(i = 0; i <= reqs_nbr; i++)
color_init_reply(reqs[i]);
widget_invalidate_bywidget(widget);
return 0;
}
/** Add data to a plot.
* \param l The Lua VM state.
* \return The number of elements pushed on stack.
* \luastack
* \lvalue A widget.
* \lparam A plot name.
* \lparam A data value.
*/
static int
luaA_graph_plot_data_add(lua_State *L)
{
widget_t *widget = luaL_checkudata(L, 1, "widget");
graph_data_t *d = widget->data;
plot_t *plot = NULL;
const char *title = luaL_checkstring(L, 2);
float value;
int i;
if(!d->size)
return 0;
plot = graph_plot_get(d, title);
/* assign incoming value */
value = MAX(luaL_checknumber(L, 3), 0);
if(++plot->index >= d->size) /* cycle inside the array */
plot->index = 0;
if(plot->scale) /* scale option is true */
{
plot->values[plot->index] = value;
if(value > plot->current_max) /* a new maximum value found */
{
plot->max_index = plot->index;
plot->current_max = value;
/* recalculate */
for (i = 0; i < d->size; i++)
plot->lines[i] = round(plot->values[i] * d->box_height / plot->current_max);
}
/* old max_index reached + current_max > normal, re-check/generate */
else if(plot->max_index == plot->index
&& plot->current_max > plot->max_value)
{
/* find the new max */
for(i = 0; i < d->size; i++)
if(plot->values[i] > plot->values[plot->max_index])
plot->max_index = i;
plot->current_max = MAX(plot->values[plot->max_index], plot->max_value);
/* recalculate */
for(i = 0; i < d->size; i++)
plot->lines[i] = round(plot->values[i] * d->box_height / plot->current_max);
}
else
plot->lines[plot->index] = round(value * d->box_height / plot->current_max);
}
else /* scale option is false - limit to d->box_height */
{
if(value < plot->max_value)
plot->lines[plot->index] = round(value * d->box_height / plot->max_value);
else
plot->lines[plot->index] = d->box_height;
}
widget_invalidate_bywidget(widget);
return 0;
}
/** Graph widget.
* DEPRECATED, see awful.widget.graph.
* \param L The Lua VM state.
* \param token The key token.
* \return The number of elements pushed on stack.
* \luastack
* \lfield plot_properties_set A function to set plot properties.
* \lfield plot_data_add A function to add data to a plot.
* \lfield height Graph height.
* \lfield widget Graph width.
* \lfield bg Background color.
* \lfield grow Direction to grow: left or right.
*/
static int
luaA_graph_index(lua_State *L, awesome_token_t token)
{
widget_t *widget = luaL_checkudata(L, 1, "widget");
graph_data_t *d = widget->data;
switch(token)
{
case A_TK_PLOT_PROPERTIES_SET:
lua_pushcfunction(L, luaA_graph_plot_properties_set);
break;
case A_TK_PLOT_DATA_ADD:
lua_pushcfunction(L, luaA_graph_plot_data_add);
break;
case A_TK_HEIGHT:
lua_pushnumber(L, d->height);
break;
case A_TK_WIDTH:
lua_pushnumber(L, d->width);
break;
case A_TK_BORDER_COLOR:
luaA_pushcolor(L, &d->border_color);
break;
case A_TK_BG:
luaA_pushcolor(L, &d->bg);
break;
case A_TK_GROW:
switch(d->grow)
{
case Left:
lua_pushliteral(L, "left");
break;
case Right:
lua_pushliteral(L, "right");
break;
default:
return 0;
}
break;
default:
return 0;
}
return 1;
}
/** Newindex function for graph widget.
* \param L The Lua VM state.
* \param token The key token.
* \return The number of elements pushed on stack.
*/
static int
luaA_graph_newindex(lua_State *L, awesome_token_t token)
{
size_t len;
widget_t *widget = luaL_checkudata(L, 1, "widget");
graph_data_t *d = widget->data;
const char *buf;
int width;
position_t pos;
color_t color;
switch(token)
{
case A_TK_HEIGHT:
d->height = luaL_checknumber(L, 3);
break;
case A_TK_WIDTH:
width = luaL_checknumber(L, 3);
if(width >= 2 && width != d->width)
{
d->width = width;
d->size = d->width - 2;
p_realloc(&d->draw_from, d->size);
p_realloc(&d->draw_to, d->size);
for(int i = 0; i < d->plots.len; i++)
{
plot_t *plot = &d->plots.tab[i];
p_realloc(&plot->values, d->size);
p_realloc(&plot->lines, d->size);
p_clear(plot->values, d->size);
p_clear(plot->lines, d->size);
plot->index = 0;
plot->current_max = 0;
plot->max_index = 0;
}
}
else
return 0;
break;
case A_TK_BG:
if((buf = luaL_checklstring(L, 3, &len)))
{
if(color_init_reply(color_init_unchecked(&color, buf, len)))
d->bg = color;
else
return 0;
}
break;
case A_TK_BORDER_COLOR:
if((buf = luaL_checklstring(L, 3, &len)))
{
if(color_init_reply(color_init_unchecked(&color, buf, len)))
d->border_color = color;
else
return 0;
}
break;
case A_TK_GROW:
buf = luaL_checklstring(L, 3, &len);
switch((pos = position_fromstr(buf, len)))
{
case Left:
case Right:
d->grow = pos;
break;
default:
return 0;
}
break;
default:
return 0;
}
widget_invalidate_bywidget(widget);
return 0;
}
/** Destroy definitively a graph widget.
* \param widget Who slay.
*/
static void
graph_destructor(widget_t *widget)
{
graph_data_t *d = widget->data;
plot_array_wipe(&d->plots);
p_delete(&d->draw_from);
p_delete(&d->draw_to);
p_delete(&d);
}
/** Create a brand new graph.
* \param w The widget to initialize.
* \return The same widget.
*/
widget_t *
widget_graph(widget_t *w)
{
luaA_deprecate(globalconf.L, "awful.widget.graph");
w->draw = graph_draw;
w->index = luaA_graph_index;
w->newindex = luaA_graph_newindex;
w->destructor = graph_destructor;
w->geometry = graph_geometry;
w->extents = graph_extents;
graph_data_t *d = w->data = p_new(graph_data_t, 1);
d->width = 80;
d->height = 0.80;
d->size = d->width - 2;
d->grow = Left;
d->draw_from = p_new(int, d->size);
d->draw_to = p_new(int, d->size);
xcolor_to_color(&globalconf.colors.bg, &d->bg);
xcolor_to_color(&globalconf.colors.fg, &d->border_color);
return w;
}
/* This is used for building documentation. */
static const struct luaL_reg awesome_graph_meta[] __attribute__ ((unused)) =
{
{ "plot_properties_set", luaA_graph_plot_properties_set },
{ "plot_data_add", luaA_graph_plot_data_add },
};
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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