311 lines
8.5 KiB
C
311 lines
8.5 KiB
C
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/**
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* @file lv_arc.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "lv_arc.h"
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#if USE_LV_ARC != 0
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#include "../lv_misc/lv_math.h"
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#include "../lv_draw/lv_draw_arc.h"
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#include "../lv_themes/lv_theme.h"
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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static bool lv_arc_design(lv_obj_t * arc, const lv_area_t * mask, lv_design_mode_t mode);
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static lv_res_t lv_arc_signal(lv_obj_t * arc, lv_signal_t sign, void * param);
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/**********************
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* STATIC VARIABLES
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**********************/
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static lv_signal_func_t ancestor_signal;
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static lv_design_func_t ancestor_design;
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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/**
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* Create a arc object
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* @param par pointer to an object, it will be the parent of the new arc
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* @param copy pointer to a arc object, if not NULL then the new object will be copied from it
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* @return pointer to the created arc
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*/
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lv_obj_t * lv_arc_create(lv_obj_t * par, const lv_obj_t * copy)
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{
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LV_LOG_TRACE("arc create started");
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/*Create the ancestor of arc*/
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lv_obj_t * new_arc = lv_obj_create(par, copy);
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lv_mem_assert(new_arc);
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if(new_arc == NULL) return NULL;
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/*Allocate the arc type specific extended data*/
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lv_arc_ext_t * ext = lv_obj_allocate_ext_attr(new_arc, sizeof(lv_arc_ext_t));
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lv_mem_assert(ext);
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if(ext == NULL) return NULL;
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if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_arc);
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if(ancestor_design == NULL) ancestor_design = lv_obj_get_design_func(new_arc);
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/*Initialize the allocated 'ext' */
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ext->angle_start = 45;
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ext->angle_end = 315;
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/*The signal and design functions are not copied so set them here*/
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lv_obj_set_signal_func(new_arc, lv_arc_signal);
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lv_obj_set_design_func(new_arc, lv_arc_design);
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/*Init the new arc arc*/
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if(copy == NULL) {
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/*Set the default styles*/
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lv_theme_t * th = lv_theme_get_current();
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if(th) {
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lv_arc_set_style(new_arc, LV_ARC_STYLE_MAIN, th->arc);
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} else {
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lv_arc_set_style(new_arc, LV_ARC_STYLE_MAIN, &lv_style_plain_color);
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}
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}
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/*Copy an existing arc*/
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else {
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lv_arc_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
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ext->angle_start = copy_ext->angle_start;
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ext->angle_end = copy_ext->angle_end;
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/*Refresh the style with new signal function*/
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lv_obj_refresh_style(new_arc);
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}
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LV_LOG_INFO("arc created");
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return new_arc;
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}
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/*======================
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* Add/remove functions
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*=====================*/
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/*
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* New object specific "add" or "remove" functions come here
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*/
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/*=====================
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* Setter functions
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*====================*/
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/**
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* Set the start and end angles of an arc. 0 deg: bottom, 90 deg: right etc.
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* @param arc pointer to an arc object
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* @param start the start angle [0..360]
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* @param end the end angle [0..360]
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*/
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void lv_arc_set_angles(lv_obj_t * arc, uint16_t start, uint16_t end)
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{
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lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
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if(start > 360) start = 360;
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if(end > 360) end = 360;
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ext->angle_start = start;
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ext->angle_end = end;
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lv_obj_invalidate(arc);
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}
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/**
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* Set a style of a arc.
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* @param arc pointer to arc object
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* @param type which style should be set
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* @param style pointer to a style
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* */
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void lv_arc_set_style(lv_obj_t * arc, lv_arc_style_t type, lv_style_t * style)
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{
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switch(type) {
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case LV_ARC_STYLE_MAIN:
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lv_obj_set_style(arc, style);
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break;
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}
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}
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/*=====================
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* Getter functions
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*====================*/
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/**
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* Get the start angle of an arc.
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* @param arc pointer to an arc object
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* @return the start angle [0..360]
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*/
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uint16_t lv_arc_get_angle_start(lv_obj_t * arc)
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{
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lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
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return ext->angle_start;
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}
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/**
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* Get the end angle of an arc.
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* @param arc pointer to an arc object
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* @return the end angle [0..360]
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*/
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uint16_t lv_arc_get_angle_end(lv_obj_t * arc)
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{
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lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
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return ext->angle_end;
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}
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/**
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* Get style of a arc.
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* @param arc pointer to arc object
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* @param type which style should be get
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* @return style pointer to the style
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* */
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lv_style_t * lv_arc_get_style(const lv_obj_t * arc, lv_arc_style_t type)
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{
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lv_style_t * style = NULL;
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switch(type) {
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case LV_ARC_STYLE_MAIN:
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style = lv_obj_get_style(arc);
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break;
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default:
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style = NULL;
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break;
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}
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return style;
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}
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/*=====================
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* Other functions
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*====================*/
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/*
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* New object specific "other" functions come here
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*/
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/**********************
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* STATIC FUNCTIONS
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**********************/
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/**
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* Handle the drawing related tasks of the arcs
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* @param arc pointer to an object
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* @param mask the object will be drawn only in this area
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* @param mode LV_DESIGN_COVER_CHK: only check if the object fully covers the 'mask_p' area
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* (return 'true' if yes)
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* LV_DESIGN_DRAW: draw the object (always return 'true')
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* LV_DESIGN_DRAW_POST: drawing after every children are drawn
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* @param return true/false, depends on 'mode'
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*/
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static bool lv_arc_design(lv_obj_t * arc, const lv_area_t * mask, lv_design_mode_t mode)
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{
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/*Return false if the object is not covers the mask_p area*/
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if(mode == LV_DESIGN_COVER_CHK) {
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return false;
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}
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/*Draw the object*/
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else if(mode == LV_DESIGN_DRAW_MAIN) {
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lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
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lv_style_t * style = lv_arc_get_style(arc, LV_ARC_STYLE_MAIN);
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lv_coord_t r = (LV_MATH_MIN(lv_obj_get_width(arc), lv_obj_get_height(arc))) / 2;
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lv_coord_t x = arc->coords.x1 + lv_obj_get_width(arc) / 2;
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lv_coord_t y = arc->coords.y1 + lv_obj_get_height(arc) / 2;
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lv_opa_t opa_scale = lv_obj_get_opa_scale(arc);
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lv_draw_arc(x, y, r, mask, ext->angle_start, ext->angle_end, style, opa_scale);
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/*Draw circle on the ends if enabled */
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if(style->line.rounded) {
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lv_coord_t thick_half = style->line.width / 2;
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lv_coord_t cir_x = ((r - thick_half) * lv_trigo_sin(ext->angle_start) >> LV_TRIGO_SHIFT);
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lv_coord_t cir_y = ((r - thick_half) * lv_trigo_sin(ext->angle_start + 90) >> LV_TRIGO_SHIFT);
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lv_style_t cir_style;
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lv_style_copy(&cir_style, &lv_style_plain);
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cir_style.body.grad_color = style->line.color;
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cir_style.body.main_color = cir_style.body.grad_color;
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cir_style.body.radius = LV_RADIUS_CIRCLE;
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lv_area_t cir_area;
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cir_area.x1 = cir_x + x - thick_half;
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cir_area.y1 = cir_y + y - thick_half;
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cir_area.x2 = cir_x + x + thick_half;
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cir_area.y2 = cir_y + y + thick_half;
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lv_draw_rect(&cir_area, mask, &cir_style, opa_scale);
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cir_x = ((r - thick_half) * lv_trigo_sin(ext->angle_end) >> LV_TRIGO_SHIFT);
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cir_y = ((r - thick_half) * lv_trigo_sin(ext->angle_end + 90) >> LV_TRIGO_SHIFT);
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cir_area.x1 = cir_x + x - thick_half;
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cir_area.y1 = cir_y + y - thick_half;
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cir_area.x2 = cir_x + x + thick_half;
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cir_area.y2 = cir_y + y + thick_half;
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lv_draw_rect(&cir_area, mask, &cir_style, opa_scale);
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}
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}
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/*Post draw when the children are drawn*/
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else if(mode == LV_DESIGN_DRAW_POST) {
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}
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return true;
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}
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/**
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* Signal function of the arc
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* @param arc pointer to a arc object
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* @param sign a signal type from lv_signal_t enum
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* @param param pointer to a signal specific variable
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* @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
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*/
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static lv_res_t lv_arc_signal(lv_obj_t * arc, lv_signal_t sign, void * param)
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{
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lv_res_t res;
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/* Include the ancient signal function */
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res = ancestor_signal(arc, sign, param);
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if(res != LV_RES_OK) return res;
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if(sign == LV_SIGNAL_CLEANUP) {
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/*Nothing to cleanup. (No dynamically allocated memory in 'ext')*/
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} else if(sign == LV_SIGNAL_GET_TYPE) {
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lv_obj_type_t * buf = param;
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uint8_t i;
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for(i = 0; i < LV_MAX_ANCESTOR_NUM - 1; i++) { /*Find the last set data*/
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if(buf->type[i] == NULL) break;
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}
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buf->type[i] = "lv_arc";
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}
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return res;
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}
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#endif
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