xknob_private.h File Reference

#include "xknob.h"

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Macros
#define	XKNOB_PRIVATE_H_

Functions
void	_draw_image_knob (Widget_t *w, int width_t, int height_t)
	_draw_image_knob - internal draw the knob from image to the buffer More...
void	_draw_knob_image (void *w_, void *user_data)
	_draw_knob_image - internal draw the knob to the buffer More...
void	_draw_knob (void *w_, void *user_data)
	_draw_knob - internal draw the knob to the buffer More...
void	_knob_released (void *w_, void *button_, void *user_data)
	_knob_released - redraw the slider when buttob released More...

Macro Definition Documentation

XKNOB_PRIVATE_H_

#define XKNOB_PRIVATE_H_

Definition at line 24 of file xknob_private.h.

Function Documentation

_draw_image_knob()

void _draw_image_knob	(	Widget_t *	w,
		int	width_t,
		int	height_t
	)

_draw_image_knob - internal draw the knob from image to the buffer

Parameters

*w	- pointer to the Widget_t knob

Returns

void

Definition at line 35 of file xknob_private.c.

                                                              {
    int width = cairo_xlib_surface_get_width(w->image);
    int height = cairo_xlib_surface_get_height(w->image);
    double x = (double)width_t/(double)height;
    double y = (double)height/(double)width_t;
    double knobstate = adj_get_state(w->adj_y);
    int findex = (int)(((width/height)-1) * knobstate);
    cairo_scale(w->crb, x,x);
    //widget_set_scale(w);
    cairo_set_source_surface (w->crb, w->image, -height*findex, 0);
    cairo_rectangle(w->crb,0, 0, height, height);
    cairo_fill(w->crb);
    //widget_reset_scale(w);
    cairo_scale(w->crb, y,y);
}

References adj_get_state(), Widget_t::adj_y, Widget_t::crb, and Widget_t::image.

_draw_knob()

void _draw_knob	(	void *	w_,
		void *	user_data
	)

_draw_knob - internal draw the knob to the buffer

Parameters

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

Returns

void

get values for the knob

create a rotating pointer on the kob

show value on the kob

Definition at line 57 of file xknob_private.c.

                                           {
    Widget_t *w = (Widget_t*)w_;
    XWindowAttributes attrs;
    XGetWindowAttributes(w->app->dpy, (Window)w->widget, &attrs);
    int width = attrs.width-2;
    int height = attrs.height-2;
 
    const double scale_zero = 20 * (M_PI/180); // defines "dead zone" for knobs
    int arc_offset = 0;
    int knob_x = 0;
    int knob_y = 0;
 
    int grow = (width > height) ? height:width;
    knob_x = grow-1;
    knob_y = grow-1;
    /** get values for the knob **/
 
    int knobx = (width - knob_x) * 0.5;
    int knobx1 = width* 0.5;
 
    int knoby = (height - knob_y) * 0.5;
    int knoby1 = height * 0.5;
    if (w->image) {
        _draw_image_knob(w, width, height);
    } else {
 
        double knobstate = adj_get_state(w->adj_y);
        double angle = scale_zero + knobstate * 2 * (M_PI - scale_zero);
 
        double pointer_off =knob_x/6;
        double radius = min(knob_x-pointer_off, knob_y-pointer_off) / 2;
        double lengh_x = (knobx+radius+pointer_off/2) - radius * sin(angle);
        double lengh_y = (knoby+radius+pointer_off/2) + radius * cos(angle);
        double radius_x = (knobx+radius+pointer_off/2) - radius/ 1.18 * sin(angle);
        double radius_y = (knoby+radius+pointer_off/2) + radius/ 1.18 * cos(angle);
 
        cairo_arc(w->crb,knobx1+arc_offset, knoby1+arc_offset, knob_x/2.1, 0, 2 * M_PI );
 
        use_shadow_color_scheme(w, get_color_state(w));
        cairo_fill (w->crb);
        cairo_new_path (w->crb);
 
        use_bg_color_scheme(w, get_color_state(w));
        cairo_arc(w->crb,knobx1+arc_offset, knoby1+arc_offset, knob_x/3.1, 0, 2 * M_PI );
        cairo_fill_preserve(w->crb);
        use_fg_color_scheme(w, NORMAL_);
        cairo_set_line_width(w->crb, knobx1/15);
        cairo_stroke(w->crb);
        cairo_new_path (w->crb);
 
        /** create a rotating pointer on the kob**/
        cairo_set_line_cap(w->crb, CAIRO_LINE_CAP_ROUND); 
        cairo_set_line_join(w->crb, CAIRO_LINE_JOIN_BEVEL);
        cairo_move_to(w->crb, radius_x, radius_y);
        cairo_line_to(w->crb,lengh_x,lengh_y);
        cairo_set_line_width(w->crb,knobx1/7);
        use_fg_color_scheme(w, NORMAL_);
        cairo_stroke(w->crb);
        cairo_new_path (w->crb);
    }
    use_text_color_scheme(w, get_color_state(w));
    cairo_text_extents_t extents;
    /** show value on the kob**/
    if (w->state) {
        char s[64];
        const char* format[] = {"%.1f", "%.2f", "%.3f"};
        float value = adj_get_value(w->adj);
        if (fabs(w->adj->step)>0.99) {
            snprintf(s, 63,"%d",  (int) value);
        } else if (fabs(w->adj->step)>0.09) {
            snprintf(s, 63, format[1-1], value);
        } else {
            snprintf(s, 63, format[2-1], value);
        }
        cairo_set_font_size (w->crb, w->app->small_font/w->scale.ascale);
        cairo_text_extents(w->crb, s, &extents);
        cairo_move_to (w->crb, knobx1-extents.width/2, knoby1+extents.height/2);
        cairo_show_text(w->crb, s);
        cairo_new_path (w->crb);
    }
 
    _show_label(w, width, height);
}

References _draw_image_knob(), Widget_t::adj, adj_get_state(), adj_get_value(), Widget_t::adj_y, Widget_t::app, Resize_t::ascale, Widget_t::crb, Xputty::dpy, get_color_state(), Widget_t::image, min, NORMAL_, Widget_t::scale, Xputty::small_font, Widget_t::state, Adjustment_t::step, use_bg_color_scheme(), use_fg_color_scheme(), use_shadow_color_scheme(), use_text_color_scheme(), and Widget_t::widget.

_draw_knob_image()

void _draw_knob_image	(	void *	w_,
		void *	user_data
	)

_draw_knob_image - internal draw the knob 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 51 of file xknob_private.c.

                                                 {
    Widget_t *w = (Widget_t*)w_;
    _draw_image_knob(w, w->width, w->height);
    _show_label(w, w->width-2, w->height-2);
}

References _draw_image_knob(), Widget_t::height, and Widget_t::width.

_knob_released()

void _knob_released	(	void *	w_,
		void *	button_,
		void *	user_data
	)

_knob_released - redraw the slider when buttob released

Parameters

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

Returns

void

Definition at line 141 of file xknob_private.c.

                                                              {
    Widget_t *w = (Widget_t*)w_;
    if (w->flags & HAS_POINTER) w->state= 1;
    expose_widget(w);
}

References expose_widget(), Widget_t::flags, HAS_POINTER, and Widget_t::state.