Widget to draw a linear scale

xennex · April 6, 2020, 1:18am

This is like the linemeter except it is linear, not curved. Sorry about the name but I was working in the existing names.
Coupled with a bar it serves as a labeled axis. The chart has some similar logic.

linearscale_v

With a bar and label it makes a display

linearscale_h

The code below will not work unless you add the define to lv_conv.h. And you should update the themes too.

/*Linear scale (dependencies: *;)*/
#define LV_USE_LINEARSCALE 1

But I wanted to post this here to see if it was worth incorporating into the main code. Probably it needs a couple of style attributes added, like tick ratios.

github.com

xennex22/lvgl/blob/dev-7.0/src/lv_widgets/lv_linearscale.h

/**
 * @file lv_linearscale.h
 *
 */

#ifndef LV_LINEARSCALE_H
#define LV_LINEARSCALE_H

#ifdef __cplusplus
extern "C" {
#endif

/*********************
 *      INCLUDES
 *********************/
#include "../lv_conf_internal.h"

#if LV_USE_LINEARSCALE != 0

#include "../lv_core/lv_obj.h"

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github.com

xennex22/lvgl/blob/dev-7.0/src/lv_widgets/lv_linearscale.c

/**
 * @file lv_linearscale.c
 *
 */

/*********************
 *      INCLUDES
 *********************/
#include "lv_linearscale.h"
#if LV_USE_LINEARSCALE != 0

#include "../lv_core/lv_debug.h"
#include "../lv_draw/lv_draw.h"
#include "../lv_themes/lv_theme.h"
#include "../lv_core/lv_group.h"
#include "../lv_misc/lv_math.h"
#include "../lv_misc/lv_utils.h"

/*********************
 *      DEFINES

This file has been truncated. show original

barbiani · April 6, 2020, 1:47am

Looks great! Better yet if the ticks could be over the bar meter to save screen space.

xennex · April 6, 2020, 2:57pm

If you align the scale over the bar then it will show over the top.

linearscale_o

kisvegabor · April 7, 2020, 12:44pm

Looks good! Thank you for sharing!

heathen · May 26, 2020, 11:35am

Hi! Do you have plans do add it to the main source tree?

kisvegabor · May 27, 2020, 2:26pm

Hi,

We need to consider 2 things to add a new widget:

Is it general enough? Will it be used by a decent number of people?
The features need to planned carefully to make easy to use, light and versatile. Besides a docs page and examples need to be created. This part mainly depend on whether @xennex as time and interest to discuss it and improve the widget is needed.

ioctl · May 31, 2020, 8:07am

Great widget. This is already giving me some ideas!

CHNzyf · January 11, 2021, 1:18pm

Hello, now I see your part, I have a lot of ideas and use, could you please provide the source code? Thank you