302 lines
9.4 KiB
C
302 lines
9.4 KiB
C
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/**
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* @file lv_line.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_line.h"
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#if USE_LV_LINE != 0
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#include "../lv_draw/lv_draw.h"
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#include "../lv_misc/lv_math.h"
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#include <stdint.h>
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#include <string.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_line_design(lv_obj_t * line, const lv_area_t * mask, lv_design_mode_t mode);
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static lv_res_t lv_line_signal(lv_obj_t * line, 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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/**********************
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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 line objects
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* @param par pointer to an object, it will be the parent of the new line
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* @return pointer to the created line
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*/
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lv_obj_t * lv_line_create(lv_obj_t * par, const lv_obj_t * copy)
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{
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LV_LOG_TRACE("line create started");
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/*Create a basic object*/
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lv_obj_t * new_line = lv_obj_create(par, copy);
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lv_mem_assert(new_line);
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if(new_line == NULL) return NULL;
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if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_line);
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/*Extend the basic object to line object*/
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lv_line_ext_t * ext = lv_obj_allocate_ext_attr(new_line, sizeof(lv_line_ext_t));
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lv_mem_assert(ext);
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if(ext == NULL) return NULL;
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ext->point_num = 0;
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ext->point_array = NULL;
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ext->auto_size = 1;
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ext->y_inv = 0;
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lv_obj_set_design_func(new_line, lv_line_design);
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lv_obj_set_signal_func(new_line, lv_line_signal);
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/*Init the new line*/
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if(copy == NULL) {
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lv_obj_set_size(new_line, LV_DPI, LV_DPI); /*Auto size is enables, but set default size until no points are added*/
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lv_obj_set_style(new_line, NULL); /*Inherit parent's style*/
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lv_obj_set_click(new_line, false);
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}
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/*Copy an existing object*/
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else {
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lv_line_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
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lv_line_set_auto_size(new_line, lv_line_get_auto_size(copy));
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lv_line_set_y_invert(new_line, lv_line_get_y_invert(copy));
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lv_line_set_auto_size(new_line, lv_line_get_auto_size(copy));
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lv_line_set_points(new_line, copy_ext->point_array, copy_ext->point_num);
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/*Refresh the style with new signal function*/
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lv_obj_refresh_style(new_line);
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}
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LV_LOG_INFO("line created");
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return new_line;
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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 an array of points. The line object will connect these points.
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* @param line pointer to a line object
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* @param point_a an array of points. Only the address is saved,
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* so the array can NOT be a local variable which will be destroyed
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* @param point_num number of points in 'point_a'
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*/
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void lv_line_set_points(lv_obj_t * line, const lv_point_t * point_a, uint16_t point_num)
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{
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lv_line_ext_t * ext = lv_obj_get_ext_attr(line);
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ext->point_array = point_a;
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ext->point_num = point_num;
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if(point_num > 0 && ext->auto_size != 0) {
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uint16_t i;
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lv_coord_t xmax = LV_COORD_MIN;
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lv_coord_t ymax = LV_COORD_MIN;
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for(i = 0; i < point_num; i++) {
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xmax = LV_MATH_MAX(point_a[i].x, xmax);
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ymax = LV_MATH_MAX(point_a[i].y, ymax);
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}
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lv_style_t * style = lv_line_get_style(line);
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lv_obj_set_size(line, xmax + style->line.width, ymax + style->line.width);
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}
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lv_obj_invalidate(line);
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}
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/**
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* Enable (or disable) the auto-size option. The size of the object will fit to its points.
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* (set width to x max and height to y max)
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* @param line pointer to a line object
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* @param en true: auto size is enabled, false: auto size is disabled
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*/
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void lv_line_set_auto_size(lv_obj_t * line, bool en)
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{
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lv_line_ext_t * ext = lv_obj_get_ext_attr(line);
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if(ext->auto_size == en) return;
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ext->auto_size = en == false ? 0 : 1;
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/*Refresh the object*/
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if(en) lv_line_set_points(line, ext->point_array, ext->point_num);
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}
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/**
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* Enable (or disable) the y coordinate inversion.
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* If enabled then y will be subtracted from the height of the object,
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* therefore the y=0 coordinate will be on the bottom.
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* @param line pointer to a line object
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* @param en true: enable the y inversion, false:disable the y inversion
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*/
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void lv_line_set_y_invert(lv_obj_t * line, bool en)
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{
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lv_line_ext_t * ext = lv_obj_get_ext_attr(line);
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if(ext->y_inv == en) return;
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ext->y_inv = en == false ? 0 : 1;
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lv_obj_invalidate(line);
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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 auto size attribute
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* @param line pointer to a line object
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* @return true: auto size is enabled, false: disabled
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*/
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bool lv_line_get_auto_size(const lv_obj_t * line)
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{
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lv_line_ext_t * ext = lv_obj_get_ext_attr(line);
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return ext->auto_size == 0 ? false : true;
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}
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/**
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* Get the y inversion attribute
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* @param line pointer to a line object
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* @return true: y inversion is enabled, false: disabled
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*/
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bool lv_line_get_y_invert(const lv_obj_t * line)
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{
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lv_line_ext_t * ext = lv_obj_get_ext_attr(line);
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return ext->y_inv == 0 ? false : true;
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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 lines
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* @param line 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_line_design(lv_obj_t * line, const lv_area_t * mask, lv_design_mode_t mode)
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{
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/*A line never covers an area*/
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if(mode == LV_DESIGN_COVER_CHK) return false;
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else if(mode == LV_DESIGN_DRAW_MAIN) {
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lv_line_ext_t * ext = lv_obj_get_ext_attr(line);
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if(ext->point_num == 0 || ext->point_array == NULL) return false;
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lv_style_t * style = lv_obj_get_style(line);
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lv_opa_t opa_scale = lv_obj_get_opa_scale(line);
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lv_area_t area;
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lv_obj_get_coords(line, &area);
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lv_coord_t x_ofs = area.x1;
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lv_coord_t y_ofs = area.y1;
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lv_point_t p1;
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lv_point_t p2;
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lv_coord_t h = lv_obj_get_height(line);
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uint16_t i;
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lv_style_t circle_style; /*If rounded...*/
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lv_style_copy(&circle_style, style);
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circle_style.body.radius = LV_RADIUS_CIRCLE;
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circle_style.body.main_color = style->line.color;
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circle_style.body.grad_color = style->line.color;
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circle_style.body.opa = style->line.opa;
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lv_area_t circle_area;
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/*Read all points and draw the lines*/
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for(i = 0; i < ext->point_num - 1; i++) {
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p1.x = ext->point_array[i].x + x_ofs;
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p2.x = ext->point_array[i + 1].x + x_ofs;
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if(ext->y_inv == 0) {
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p1.y = ext->point_array[i].y + y_ofs;
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p2.y = ext->point_array[i + 1].y + y_ofs;
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} else {
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p1.y = h - ext->point_array[i].y + y_ofs;
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p2.y = h - ext->point_array[i + 1].y + y_ofs;
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}
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lv_draw_line(&p1, &p2, mask, style, opa_scale);
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/*Draw circle on the joints if enabled*/
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if(style->line.rounded) {
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circle_area.x1 = p1.x - ((style->line.width - 1) >> 1) - ((style->line.width - 1) & 0x1);
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circle_area.y1 = p1.y - ((style->line.width - 1) >> 1) - ((style->line.width - 1) & 0x1);
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circle_area.x2 = p1.x + ((style->line.width - 1) >> 1);
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circle_area.y2 = p1.y + ((style->line.width - 1) >> 1);
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lv_draw_rect(&circle_area, mask, &circle_style, opa_scale);
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}
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}
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/*Draw circle on the last point too if enabled*/
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if(style->line.rounded) {
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circle_area.x1 = p2.x - ((style->line.width - 1) >> 1) - ((style->line.width - 1) & 0x1);
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circle_area.y1 = p2.y - ((style->line.width - 1) >> 1) - ((style->line.width - 1) & 0x1);
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circle_area.x2 = p2.x + ((style->line.width - 1) >> 1);
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circle_area.y2 = p2.y + ((style->line.width - 1) >> 1);
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lv_draw_rect(&circle_area, mask, &circle_style, opa_scale);
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}
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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 line
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* @param line pointer to a line object
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* @param sign a signal type from lv_signal_t enum
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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_line_signal(lv_obj_t * line, 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(line, sign, param);
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if(res != LV_RES_OK) return res;
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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_line";
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} else if(sign == LV_SIGNAL_REFR_EXT_SIZE) {
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lv_style_t * style = lv_line_get_style(line);
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if(line->ext_size < style->line.width) line->ext_size = style->line.width;
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}
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return res;
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}
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#endif
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