awesome/widgets/graph.c at 3.2 · hishamhm/awesome

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* graph.c - a graph widget

* 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"

extern awesome_t globalconf;

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 */

xcolor_t color_start;

/** Color at middle of graph */

xcolor_t pcolor_center;

/** Color at end of graph */

xcolor_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 */

xcolor_t bg;

/** Border color */

xcolor_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.color_start = globalconf.colors.fg;

plot.vertical_gradient = true;

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, int screen, int height, int width)

{

area_t geometry;

graph_data_t *d = widget->data;

geometry.height = height;

geometry.width = d->width;

return geometry;

}

/** Draw a graph widget.

* \param ctx The draw context.

* \param screen The screen number.

* \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, int screen, 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 = luaA_checkudata(L, 1, "widget");

graph_data_t *d = (*widget)->data;

float max_value;

const char *title, *buf;

size_t len;

plot_t *plot = NULL;

xcolor_init_request_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] = xcolor_init_unchecked(&plot->color_start, buf, len);

if((buf = luaA_getopt_lstring(L, 3, "fg_center", NULL, &len)))

reqs[++reqs_nbr] = xcolor_init_unchecked(&plot->pcolor_center, buf, len);

if((buf = luaA_getopt_lstring(L, 3, "fg_end", NULL, &len)))

reqs[++reqs_nbr] = xcolor_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++)

xcolor_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 = luaA_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.

* \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 = luaA_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 = luaA_checkudata(L, 1, "widget");

graph_data_t *d = (*widget)->data;

const char *buf;

int width;

position_t pos;

xcolor_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;

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(xcolor_init_reply(xcolor_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(xcolor_init_reply(xcolor_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)

{

w->draw = graph_draw;

w->index = luaA_graph_index;

w->newindex = luaA_graph_newindex;

w->destructor = graph_destructor;

w->geometry = graph_geometry;

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);

d->bg = globalconf.colors.bg;

d->border_color = globalconf.colors.fg;

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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