xmeter_private.h File Reference

#include "xmeter.h"

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Macros
#define	XMETER_PRIVATE_H_

Functions
void	_draw_vmeter_scale (void *w_, void *user_data)
	_draw_meter_scale - draw a meter scale beside the meter widget More...
void	_draw_hmeter_scale (void *w_, void *user_data)
	_draw_hmeter_scale - draw a hmeter scale beside the meter widget More...
float	_log_meter (float db)
	_log_meter - logaritmic meter deflection More...
void	_create_vertical_meter_image (Widget_t *w, int width, int height)
	_create_vertical_meter_image - internal draw the meter image to the cairo image surface More...
void	_create_horizontal_meter_image (Widget_t *w, int width, int height)
	_create_horizontal_meter_image - internal draw the meter image to the cairo image surface More...
void	_draw_v_meter (void *w_, void *user_data)
	_draw_v_meter - internal draw the meter to the buffer More...
void	_draw_h_meter (void *w_, void *user_data)
	_draw_h_meter - internal draw the meter to the buffer More...

Macro Definition Documentation

XMETER_PRIVATE_H_

#define XMETER_PRIVATE_H_

Definition at line 24 of file xmeter_private.h.

Function Documentation

_create_horizontal_meter_image()

void _create_horizontal_meter_image	(	Widget_t *	w,
		int	width,
		int	height
	)

_create_horizontal_meter_image - internal draw the meter image to the cairo image surface

Parameters

*w	- pointer to the Widget_t meter
width	- widget width
height	- widget height

Returns

void

Definition at line 194 of file xmeter_private.c.

                                                                        {
    w->image = cairo_surface_create_similar (w->surface, 
                        CAIRO_CONTENT_COLOR_ALPHA, width, height*2);
    cairo_t *cri = cairo_create (w->image);
 
    cairo_rectangle(cri,0.0, 0.0, width, height);
    use_shadow_color_scheme(w, NORMAL_);
    cairo_fill(cri);
 
    cairo_rectangle(cri, 0.0, height, width, height);
    use_shadow_color_scheme(w, NORMAL_);
    cairo_fill(cri);
 
    cairo_pattern_t *pat = cairo_pattern_create_linear (0, 0, width, 0.0);
    cairo_pattern_add_color_stop_rgba(pat, 0.0, 0.1, 0.5, 0.1, 0.4);
    cairo_pattern_add_color_stop_rgba(pat, 0.8, 0.4, 0.4, 0.1, 0.4);
    cairo_pattern_add_color_stop_rgba(pat, 1.0, 0.5, 0.0, 0.0, 0.4);
    cairo_set_source(cri, pat);
 
    int c = (height)/2 ;
    int ci = c-2;
 
    int i = 1;
    int j = 1;
    for(;i<width;) {
        for(;j<height;) {
            cairo_rectangle(cri,i,j,2,ci);
            cairo_fill(cri);
            j +=c;
        }
        i +=3;
        j = 1;
    }
 
    cairo_pattern_destroy (pat);
    pat = cairo_pattern_create_linear (0, 0, width, 0.0);
    cairo_pattern_add_color_stop_rgba(pat, 0.0, 0.1, 0.5, 0.1, 1);
    cairo_pattern_add_color_stop_rgba(pat, 0.8, 0.4, 0.4, 0.1, 1);
    cairo_pattern_add_color_stop_rgba(pat, 1.0, 0.5, 0.0, 0.0, 1);
    cairo_set_source(cri, pat);
    i = 1;
    j = 1;
    for(;i<width;) {
        for(;j<height;) {
            cairo_rectangle(cri,i,height+j,2,ci);
            cairo_fill(cri);
            j +=c;
        }
        i +=3;
        j = 1;
    }
 
    cairo_pattern_destroy (pat);
    cairo_destroy(cri);
}

References Widget_t::image, NORMAL_, Widget_t::surface, and use_shadow_color_scheme().

_create_vertical_meter_image()

void _create_vertical_meter_image	(	Widget_t *	w,
		int	width,
		int	height
	)

_create_vertical_meter_image - internal draw the meter image to the cairo image surface

Parameters

*w	- pointer to the Widget_t meter
width	- widget width
height	- widget height

Returns

void

Definition at line 138 of file xmeter_private.c.

                                                                      {
    w->image = cairo_surface_create_similar (w->surface, 
                        CAIRO_CONTENT_COLOR_ALPHA, width*2, height);
    cairo_t *cri = cairo_create (w->image);
 
    cairo_rectangle(cri,0.0, 0.0, width, height);
    use_shadow_color_scheme(w, NORMAL_);
    cairo_fill(cri);
 
    cairo_rectangle(cri,width, 0.0, width, height);
    use_shadow_color_scheme(w, NORMAL_);
    cairo_fill(cri);
 
    cairo_pattern_t *pat = cairo_pattern_create_linear (0, 0, 0.0, height);
    cairo_pattern_add_color_stop_rgba(pat, 1.0, 0.1, 0.5, 0.1, 0.4);
    cairo_pattern_add_color_stop_rgba(pat, 0.2, 0.4, 0.4, 0.1, 0.4);
    cairo_pattern_add_color_stop_rgba(pat, 0.0, 0.5, 0.0, 0.0, 0.4);
    cairo_set_source(cri, pat);
 
    int c = (width)/2 ;
    int ci = c-2;
 
    int i = 1;
    int j = 1;
    for(;i<height-3;) {
        for(;j<width;) {
            cairo_rectangle(cri,j,i,ci,2);
            cairo_fill(cri);
            j +=c;
        }
        i +=3;
        j = 1;
    }
 
    cairo_pattern_destroy (pat);
    pat = cairo_pattern_create_linear (0, 0, 0.0, height);
    cairo_pattern_add_color_stop_rgba(pat, 1.0, 0.1, 0.5, 0.1, 1);
    cairo_pattern_add_color_stop_rgba(pat, 0.2, 0.4, 0.4, 0.1, 1);
    cairo_pattern_add_color_stop_rgba(pat, 0.0, 0.5, 0.0, 0.0, 1);
    cairo_set_source(cri, pat);
    i = 1;
    j = 1;
    for(;i<height-3;) {
        for(;j<width;) {
            cairo_rectangle(cri,width+j,i,ci,2);
            cairo_fill(cri);
            j +=c;
        }
        i +=3;
        j = 1;
    }
 
    cairo_pattern_destroy (pat);
    cairo_destroy(cri);
}

References Widget_t::image, NORMAL_, Widget_t::surface, and use_shadow_color_scheme().

_draw_h_meter()

void _draw_h_meter	(	void *	w_,
		void *	user_data
	)

_draw_h_meter - internal draw the meter to the buffer

Parameters

*w_	- void pointer to the Widget_t button
*user_data	- void pointer to attached user_data

Returns

void

Definition at line 270 of file xmeter_private.c.

                                              {
    Widget_t *w = (Widget_t*)w_;
 
    int width = cairo_xlib_surface_get_width(w->image);
    int height = cairo_xlib_surface_get_height(w->image);
    double meterstate = _log_meter(adj_get_value(w->adj_x));
    double oldstate = _log_meter(w->adj_x->start_value);
    widget_set_scale(w);
    cairo_set_source_surface (w->crb, w->image, 0, 0);
    cairo_rectangle(w->crb,0, 0, width, height/2);
    cairo_fill(w->crb);
    cairo_set_source_surface (w->crb, w->image, 0, -height/2);
    cairo_rectangle(w->crb, 0, 0, width*meterstate, height/2);
    cairo_fill(w->crb);
 
    cairo_rectangle(w->crb,(width*oldstate)-3, 0, 3, height/2);
    cairo_fill(w->crb);
 
    widget_reset_scale(w);
}

References _log_meter(), adj_get_value(), Widget_t::adj_x, Widget_t::crb, Widget_t::image, Adjustment_t::start_value, widget_reset_scale(), and widget_set_scale().

_draw_hmeter_scale()

void _draw_hmeter_scale	(	void *	w_,
		void *	user_data
	)

_draw_hmeter_scale - draw a hmeter scale beside the meter widget

Parameters

w	- the widget to draw to

Returns

void

Definition at line 69 of file xmeter_private.c.

                                                   {
    Widget_t *w = (Widget_t*)w_;
    XWindowAttributes attrs;
    XGetWindowAttributes(w->app->dpy, (Window)w->widget, &attrs);
    int rect_width = attrs.width;
    int rect_height = attrs.height;
    double x0      = 0;
    double y0      = 0;
 
    int  db_points[] = { -50, -40, -30, -20, -15, -10, -6, -3, 0, 3 };
    char  buf[32];
 
    cairo_set_font_size (w->crb, (float)rect_height/2);
    cairo_set_source_rgba(w->crb, 0.6, 0.6, 0.6, 0.6);
 
    for (unsigned int i = 0; i < sizeof (db_points)/sizeof (db_points[0]); ++i)
    {
        float fraction = _log_meter(db_points[i]);
        //cairo_set_source_rgb (w->crb,0.32 + 0.22*i/2,0.5 +  0.1*i/2, 0.1);
 
        cairo_move_to (w->crb, x0+(rect_width * fraction),y0+rect_height*0.1);
        cairo_line_to (w->crb, x0+(rect_width * fraction) ,y0+rect_height*0.6);
        if (i<6)
        {
            snprintf (buf, sizeof (buf), "%d", db_points[i]);
            cairo_move_to (w->crb, x0+(rect_width * fraction)+3,y0+rect_height);
        }
        else
        {
            snprintf (buf, sizeof (buf), " %d", db_points[i]);
            cairo_move_to (w->crb, x0+(rect_width * fraction)+3,y0+rect_height );
        }
        cairo_show_text (w->crb, buf);
    }
 
    cairo_set_source_rgba(w->crb, 0.6, 0.6, 0.6, 0.6);
    cairo_set_line_width(w->crb, 1.5);
    cairo_stroke(w->crb);
}

References _log_meter(), Widget_t::app, Widget_t::crb, Xputty::dpy, and Widget_t::widget.

_draw_v_meter()

void _draw_v_meter	(	void *	w_,
		void *	user_data
	)

_draw_v_meter - internal draw the meter to the buffer

Parameters

*w_	- void pointer to the Widget_t button
*user_data	- void pointer to attached user_data

Returns

void

Definition at line 250 of file xmeter_private.c.

                                              {
    Widget_t *w = (Widget_t*)w_;
 
    int width = cairo_xlib_surface_get_width(w->image);
    int height = cairo_xlib_surface_get_height(w->image);
    double meterstate = _log_meter(adj_get_value(w->adj_y));
    double oldstate = _log_meter(w->adj_y->start_value);
    widget_set_scale(w);
    cairo_set_source_surface (w->crb, w->image, 0, 0);
    cairo_rectangle(w->crb,0, 0, width/2, height);
    cairo_fill(w->crb);
    cairo_set_source_surface (w->crb, w->image, -width/2, 0);
    cairo_rectangle(w->crb, 0, height, width/2, -height*meterstate);
    cairo_fill(w->crb);
 
    cairo_rectangle(w->crb, 0, height-height*oldstate, width/2, 3);
    cairo_fill(w->crb);
    widget_reset_scale(w);
}

References _log_meter(), adj_get_value(), Widget_t::adj_y, Widget_t::crb, Widget_t::image, Adjustment_t::start_value, widget_reset_scale(), and widget_set_scale().

_draw_vmeter_scale()

void _draw_vmeter_scale	(	void *	w_,
		void *	user_data
	)

_draw_meter_scale - draw a meter scale beside the meter widget

Parameters

w	- the widget to draw to

Returns

void

Definition at line 25 of file xmeter_private.c.

                                                   {
    Widget_t *w = (Widget_t*)w_;
    XWindowAttributes attrs;
    XGetWindowAttributes(w->app->dpy, (Window)w->widget, &attrs);
    int rect_width = attrs.width;
    int rect_height = attrs.height;
    double x0      = 0;
    double y0      = 0;
 
    int  db_points[] = { -50, -40, -30, -20, -15, -10, -6, -3, 0, 3 };
    //int  db_points[] = { -50, -40, -30, -20, -10, -3, 0, 4 };
    char  buf[32];
 
    cairo_set_font_size (w->crb, (float)rect_width/2);
    cairo_set_source_rgb(w->crb, 0.8, 0.8, 0.8);
 
    for (unsigned int i = 0; i < sizeof (db_points)/sizeof (db_points[0]); ++i)
    {
        float fraction = _log_meter((double)db_points[i]);
        cairo_move_to (w->crb, 0,y0+rect_height - (rect_height * fraction));
        cairo_line_to (w->crb, x0+rect_width-3 ,y0+rect_height -  (rect_height * fraction));
        if (i<6)
        {
            snprintf (buf, sizeof (buf), "%d", db_points[i]);
            cairo_move_to (w->crb, x0+rect_width*0.1,y0+rect_height - (rect_height * fraction)-3);
        }
        else if (i<8)
        {
            snprintf (buf, sizeof (buf), "%d", db_points[i]);
            cairo_move_to (w->crb, x0+rect_width*0.2,y0+rect_height - (rect_height * fraction)-3);
        }
        else
        {
            snprintf (buf, sizeof (buf), " %d", db_points[i]);
            cairo_move_to (w->crb, x0+rect_width*0.21,y0+rect_height - (rect_height * fraction)-3);
        }
        cairo_show_text (w->crb, buf);
    }
 
    cairo_set_source_rgb(w->crb, 0.6, 0.6, 0.6);
    cairo_set_line_width(w->crb, 2.0);
    cairo_stroke(w->crb);
}

References _log_meter(), Widget_t::app, Widget_t::crb, Xputty::dpy, and Widget_t::widget.

_log_meter()

float _log_meter

(

float

db

)

_log_meter - logaritmic meter deflection

Parameters

db	- mesured db

Returns

float - state to show on the meter

Definition at line 109 of file xmeter_private.c.

                            {
    float def = 0.0f; /* Meter deflection %age */
 
    if (db < -70.0f) {
        def = 0.0f;
    } else if (db < -60.0f) {
        def = (db + 70.0f) * 0.25f;
    } else if (db < -50.0f) {
        def = (db + 60.0f) * 0.5f + 2.5f;
    } else if (db < -40.0f) {
        def = (db + 50.0f) * 0.75f + 7.5f;
    } else if (db < -30.0f) {
        def = (db + 40.0f) * 1.5f + 15.0f;
    } else if (db < -20.0f) {
        def = (db + 30.0f) * 2.0f + 30.0f;
    } else if (db < 6.0f) {
        def = (db + 20.0f) * 2.5f + 50.0f;
    } else {
        def = 115.0f;
    }
 
    /* 115 is the deflection %age that would be
       when db=6.0. this is an arbitrary
       endpoint for our scaling.
    */
 
    return def/115.0f;
}