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#include "../../lv_examples.h"
#if LV_USE_CHART && LV_DRAW_SW_COMPLEX && LV_BUILD_EXAMPLES
static void hook_division_lines(lv_event_t * e);
static void add_faded_area(lv_event_t * e);
static void draw_event_cb(lv_event_t * e);
/**
* Add a faded area effect to the line chart and make some division lines ticker
*/
void lv_example_chart_5(void)
{
/*Create a chart*/
lv_obj_t * chart = lv_chart_create(lv_screen_active());
lv_chart_set_type(chart, LV_CHART_TYPE_LINE); /*Show lines and points too*/
lv_obj_set_size(chart, 200, 150);
lv_obj_set_style_pad_all(chart, 0, 0);
lv_obj_set_style_radius(chart, 0, 0);
lv_obj_center(chart);
lv_chart_set_div_line_count(chart, 5, 7);
lv_obj_add_event_cb(chart, draw_event_cb, LV_EVENT_DRAW_TASK_ADDED, NULL);
lv_obj_add_flag(chart, LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS);
lv_chart_series_t * ser = lv_chart_add_series(chart, lv_palette_main(LV_PALETTE_RED), LV_CHART_AXIS_PRIMARY_Y);
uint32_t i;
for(i = 0; i < 10; i++) {
lv_chart_set_next_value(chart, ser, lv_rand(10, 80));
}
}
static void draw_event_cb(lv_event_t * e)
{
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = draw_task->draw_dsc;
if(base_dsc->part == LV_PART_ITEMS && draw_task->type == LV_DRAW_TASK_TYPE_LINE) {
add_faded_area(e);
}
/*Hook the division lines too*/
if(base_dsc->part == LV_PART_MAIN && draw_task->type == LV_DRAW_TASK_TYPE_LINE) {
hook_division_lines(e);
}
}
static void add_faded_area(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_target(e);
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = draw_task->draw_dsc;
const lv_chart_series_t * ser = lv_chart_get_series_next(obj, NULL);
/*Draw a triangle below the line witch some opacity gradient*/
lv_draw_line_dsc_t * draw_line_dsc = draw_task->draw_dsc;
lv_draw_triangle_dsc_t tri_dsc;
lv_draw_triangle_dsc_init(&tri_dsc);
tri_dsc.p[0].x = draw_line_dsc->p1.x;
tri_dsc.p[0].y = draw_line_dsc->p1.y;
tri_dsc.p[1].x = draw_line_dsc->p2.x;
tri_dsc.p[1].y = draw_line_dsc->p2.y;
tri_dsc.p[2].x = draw_line_dsc->p1.y < draw_line_dsc->p2.y ? draw_line_dsc->p1.x : draw_line_dsc->p2.x;
tri_dsc.p[2].y = LV_MAX(draw_line_dsc->p1.y, draw_line_dsc->p2.y);
tri_dsc.bg_grad.dir = LV_GRAD_DIR_VER;
int32_t full_h = lv_obj_get_height(obj);
int32_t fract_uppter = (int32_t)(LV_MIN(draw_line_dsc->p1.y, draw_line_dsc->p2.y) - obj->coords.y1) * 255 / full_h;
int32_t fract_lower = (int32_t)(LV_MAX(draw_line_dsc->p1.y, draw_line_dsc->p2.y) - obj->coords.y1) * 255 / full_h;
tri_dsc.bg_grad.stops[0].color = ser->color;
tri_dsc.bg_grad.stops[0].opa = 255 - fract_uppter;
tri_dsc.bg_grad.stops[0].frac = 0;
tri_dsc.bg_grad.stops[1].color = ser->color;
tri_dsc.bg_grad.stops[1].opa = 255 - fract_lower;
tri_dsc.bg_grad.stops[1].frac = 255;
lv_draw_triangle(base_dsc->layer, &tri_dsc);
/*Draw rectangle below the triangle*/
lv_draw_rect_dsc_t rect_dsc;
lv_draw_rect_dsc_init(&rect_dsc);
rect_dsc.bg_grad.dir = LV_GRAD_DIR_VER;
rect_dsc.bg_grad.stops[0].color = ser->color;
rect_dsc.bg_grad.stops[0].frac = 0;
rect_dsc.bg_grad.stops[0].opa = 255 - fract_lower;
rect_dsc.bg_grad.stops[1].color = ser->color;
rect_dsc.bg_grad.stops[1].frac = 255;
rect_dsc.bg_grad.stops[1].opa = 0;
lv_area_t rect_area;
rect_area.x1 = (int32_t)draw_line_dsc->p1.x;
rect_area.x2 = (int32_t)draw_line_dsc->p2.x - 1;
rect_area.y1 = (int32_t)LV_MAX(draw_line_dsc->p1.y, draw_line_dsc->p2.y) - 1;
rect_area.y2 = (int32_t)obj->coords.y2;
lv_draw_rect(base_dsc->layer, &rect_dsc, &rect_area);
}
static void hook_division_lines(lv_event_t * e)
{
lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
lv_draw_dsc_base_t * base_dsc = draw_task->draw_dsc;
lv_draw_line_dsc_t * line_dsc = draw_task->draw_dsc;
/*Vertical line*/
if(line_dsc->p1.x == line_dsc->p2.x) {
line_dsc->color = lv_palette_lighten(LV_PALETTE_GREY, 1);
if(base_dsc->id1 == 3) {
line_dsc->width = 2;
line_dsc->dash_gap = 0;
line_dsc->dash_width = 0;
}
else {
line_dsc->width = 1;
line_dsc->dash_gap = 6;
line_dsc->dash_width = 6;
}
}
/*Horizontal line*/
else {
if(base_dsc->id1 == 2) {
line_dsc->width = 2;
line_dsc->dash_gap = 0;
line_dsc->dash_width = 0;
}
else {
line_dsc->width = 2;
line_dsc->dash_gap = 6;
line_dsc->dash_width = 6;
}
if(base_dsc->id1 == 1 || base_dsc->id1 == 3) {
line_dsc->color = lv_palette_main(LV_PALETTE_GREEN);
}
else {
line_dsc->color = lv_palette_lighten(LV_PALETTE_GREY, 1);
}
}
}
#endif
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