xmeter.h File Reference

Go to the source code of this file.

Functions
float	power2db (Widget_t *w, float power)
	power2db - power (db) input to db output consider falloff
Widget_t *	add_vmeter (Widget_t *parent, const char *label, bool show_scale, int x, int y, int width, int height)
	add_vmeter - add a vumeter to a Widget_t connect to func.value_changed_callback to implement your actions
Widget_t *	add_hmeter (Widget_t *parent, const char *label, bool show_scale, int x, int y, int width, int height)
	add_hmeter - add a vumeter to a Widget_t connect to func.value_changed_callback to implement your actions

Function Documentation

add_hmeter()

Widget_t * add_hmeter	(	Widget_t *	parent,
		const char *	label,
		bool	show_scale,
		int	x,
		int	y,
		int	width,
		int	height
	)

add_hmeter - add a vumeter to a Widget_t connect to func.value_changed_callback to implement your actions

Parameters

*parent	- pointer to the Widget_t request the vumeter
*label	- Label to show on the vumeter
show_scale	- show a Db scale on the vumeter
x,y,width,height	- the position/geometry to create the vumeter

Returns

Widget_t* - pointer to the Widget_t meter struct

Definition at line 66 of file xmeter.c.

                                                     {
 
    Widget_t *wid = create_widget(parent->app, parent, x, y, width, height);
    _create_horizontal_meter_image(wid, width, height);
    wid->label = label;
    wid->adj_x = add_adjustment(wid,-70.0, -70.0, -70.0, 6.0,0.001, CL_METER);
    wid->adj = wid->adj_x;
    wid->flags &= ~USE_TRANSPARENCY;
    wid->scale.gravity = ASPECT;
    wid->func.expose_callback = _draw_h_meter;
    if (show_scale) {
        Widget_t *wid2 = create_widget(parent->app, parent, x, y+height, width, height);
        wid2->scale.gravity = ASPECT;
        wid2->func.expose_callback =_draw_hmeter_scale;
    }
    return wid;
}

References _create_horizontal_meter_image(), _draw_h_meter(), _draw_hmeter_scale(), add_adjustment(), Widget_t::adj, Widget_t::adj_x, Widget_t::app, ASPECT, CL_METER, create_widget(), Func_t::expose_callback, Widget_t::flags, Widget_t::func, Resize_t::gravity, Widget_t::label, and Widget_t::scale.

add_vmeter()

Widget_t * add_vmeter	(	Widget_t *	parent,
		const char *	label,
		bool	show_scale,
		int	x,
		int	y,
		int	width,
		int	height
	)

add_vmeter - add a vumeter to a Widget_t connect to func.value_changed_callback to implement your actions

Parameters

*parent	- pointer to the Widget_t request the vumeter
*label	- Label to show on the vumeter
show_scale	- show a Db scale on the vumeter
x,y,width,height	- the position/geometry to create the vumeter

Returns

Widget_t* - pointer to the Widget_t mete struct

Definition at line 47 of file xmeter.c.

                                                     {
 
    Widget_t *wid = create_widget(parent->app, parent, x, y, width, height);
    _create_vertical_meter_image(wid, width, height);
    wid->label = label;
    wid->adj_y = add_adjustment(wid,-70.0, -70.0, -70.0, 6.0,0.001, CL_METER);
    wid->adj = wid->adj_y;
    wid->flags &= ~USE_TRANSPARENCY;
    wid->scale.gravity = ASPECT;
    wid->func.expose_callback = _draw_v_meter;
    if (show_scale) {
        Widget_t *wid2 = create_widget(parent->app, parent, x+width, y, width, height);
        wid2->scale.gravity = ASPECT;
        wid2->func.expose_callback =_draw_vmeter_scale;
    }
    return wid;
}

References _create_vertical_meter_image(), _draw_v_meter(), _draw_vmeter_scale(), add_adjustment(), Widget_t::adj, Widget_t::adj_y, Widget_t::app, ASPECT, CL_METER, create_widget(), Func_t::expose_callback, Widget_t::flags, Widget_t::func, Resize_t::gravity, Widget_t::label, and Widget_t::scale.

power2db()

float power2db	(	Widget_t *	w,
		float	power
	)

power2db - power (db) input to db output consider falloff

Parameters

*w	- pointer to the Widget_t belongs to the vumeter
power	- mesured power

Returns

float - calculated db

Definition at line 26 of file xmeter.c.

                                         {
    const float falloff = 27 * 60 * 0.0005;
    const float fallsoft = 6 * 60 * 0.0005;
    //power = 20.*log10(power);
    if (power <=  20.*log10(0.00021)) { // -70db
        power = 20.*log10(0.00000000001); //-137db
        w->adj->start_value = min(0.0,w->adj->start_value - fallsoft);
    }
    // retrieve old meter value and consider falloff
    if (power < w->adj->std_value) {
        power = max(power, w->adj->std_value - falloff);
        w->adj->start_value = min(0.0,w->adj->start_value - fallsoft);
    }
    if (power > w->adj->start_value) {
        w->adj->start_value = power ;
    }
    
    w->adj->std_value = power;
    return  power;
}

References Widget_t::adj, Adjustment_t::start_value, and Adjustment_t::std_value.