#include "lvgl.h" #include "speedmeter.h" #include "speedmeter_private.h" #include "src/core/lv_obj_class_private.h" #define MY_CLASS (&lv_speedmeter_class) static void lv_speedmeter_constructor(const lv_obj_class_t* class_p, lv_obj_t* obj); static void lv_speedmeter_event(const lv_obj_class_t* class_p, lv_event_t* e); const lv_obj_class_t lv_speedmeter_class = { .constructor_cb = lv_speedmeter_constructor, .event_cb = lv_speedmeter_event, .width_def = LV_SIZE_CONTENT, .height_def = LV_SIZE_CONTENT, .instance_size = sizeof(lv_speedmeter_t), .base_class = &lv_obj_class, .name = "lv_speedmeter", LV_PROPERTY_CLASS_FIELDS(speedmeter, SPEEDMETER) }; static void lv_speedmeter_constructor(const lv_obj_class_t* class_p, lv_obj_t* obj) { LV_UNUSED(class_p); LV_TRACE_OBJ_CREATE("begin"); lv_speedmeter_t* speedmeter = (lv_speedmeter_t*)obj; speedmeter->speed = 0; lv_obj_remove_flag(obj, LV_OBJ_FLAG_CLICKABLE); LV_TRACE_OBJ_CREATE("finished"); } static void lv_speedmeter_event(const lv_obj_class_t* class_p, lv_event_t* e) { LV_UNUSED(class_p); lv_result_t res; res = lv_obj_event_base(MY_CLASS, e); if (res != LV_RESULT_OK) return; } static void speed_arc_value_changed(lv_event_t* event) { lv_obj_t* arc = lv_event_get_target(event); int32_t value = lv_arc_get_value(arc); lv_speedmeter_t* self = (lv_speedmeter_t*)lv_event_get_user_data(event); float speed = value * self->max_speed / 100.0; lv_label_set_text_fmt(self->speed_label, "%0.1f", speed); } lv_obj_t* lv_speedmeter_create(lv_obj_t* parent, int max_speed, const char* unit) { LV_LOG_INFO("begin"); lv_obj_t* obj = lv_obj_class_create_obj(MY_CLASS, parent); lv_obj_class_init_obj(obj); lv_obj_set_size(obj, lv_pct(100), lv_pct(100)); lv_obj_update_layout(obj); lv_speedmeter_t* self = (lv_speedmeter_t*)obj; self->max_speed = max_speed; lv_obj_t* arc = lv_arc_create(obj); lv_coord_t size = LV_MIN( lv_obj_get_width(obj), lv_obj_get_height(obj) ) * 0.8; lv_obj_set_size(arc, size, size); lv_obj_remove_style(arc, NULL, LV_PART_KNOB); lv_obj_set_style_arc_color(arc, lv_color_hex(0x367BF1), LV_PART_INDICATOR); lv_obj_set_style_arc_color(arc, lv_color_hex(0x21242A), LV_PART_MAIN); lv_obj_set_style_arc_width(arc, 12, LV_PART_INDICATOR); lv_obj_set_style_arc_width(arc, 12, LV_PART_MAIN); lv_obj_center(arc); lv_obj_update_layout(arc); self->speed_arc = arc; LV_FONT_DECLARE(lv_font_din_26); //速度标签 lv_obj_t* speed_label = lv_label_create(obj); lv_obj_set_align(speed_label, LV_ALIGN_CENTER); lv_label_set_text(speed_label, "0.0"); LV_FONT_DECLARE(lv_font_din_42); lv_obj_set_style_text_font(speed_label, &lv_font_din_42, 0); lv_obj_set_style_text_color(speed_label, lv_color_hex(0xffffff), 0); self->speed_label = speed_label; lv_obj_t* speed_unit_label = lv_label_create(obj); lv_obj_align(speed_unit_label, LV_ALIGN_CENTER, 0, 30); lv_obj_set_style_text_font(speed_unit_label, &lv_font_din_26, 0); if (unit == NULL || strnlen(unit, 10) == 0) { lv_label_set_text(speed_unit_label, "km/h"); } else { lv_label_set_text(speed_unit_label, unit); } lv_obj_set_style_text_color(speed_unit_label, lv_color_hex(0xB4BCC8), 0); self->speed_unit_label = speed_unit_label; lv_obj_add_event_cb(arc, speed_arc_value_changed, LV_EVENT_VALUE_CHANGED, self); lv_arc_set_value(arc, 0); // 获取角度范围 int32_t start_angle = lv_arc_get_bg_angle_start(arc); int32_t end_angle = lv_arc_get_bg_angle_end(arc); int32_t angle_range = (end_angle >= start_angle) ? (end_angle - start_angle) : (360 - start_angle + end_angle); // 获取中心点 lv_coord_t cx = lv_obj_get_width(arc) / 2; lv_coord_t cy = lv_obj_get_height(arc) / 2; // 半径（用中心半径更准） lv_coord_t radius = LV_MIN(lv_obj_get_width(arc), lv_obj_get_height(arc)) / 2; // 画刻度 static lv_point_precise_t line_points[(90 / 5 + 1) * 2] = { {0,0} }; for (int speed = 0; speed <= max_speed; speed += 5) { int32_t angle = start_angle + (angle_range * speed) / max_speed; if (angle >= 360) angle -= 360; int32_t cos_v = lv_trigo_cos(angle); int32_t sin_v = lv_trigo_sin(angle); lv_obj_t* line = lv_line_create(arc); lv_coord_t inner_r = radius; // 刻度内侧 lv_coord_t outer_r = radius; // 刻度外侧 // 粗细区分（10为大刻度） if (speed % 10 == 0) { lv_obj_set_style_line_width(line, 3, 0); inner_r -= 20; if (speed != 0 && speed != max_speed) { outer_r -= 13; } lv_obj_set_style_line_color(line, lv_color_hex(0xffffff), 0); } else { lv_obj_set_style_line_width(line, 2, 0); outer_r -= 14; inner_r -= 18; lv_obj_set_style_line_color(line, lv_color_hex(0x21242A), 0); } // 起点 lv_point_precise_t* p = line_points + (speed / 5) * 2; p[0].x = cx + (inner_r * cos_v) / 32767; p[0].y = cy + (inner_r * sin_v) / 32767; // 终点 p[1].x = cx + (outer_r * cos_v) / 32767; p[1].y = cy + (outer_r * sin_v) / 32767; if (speed % 10 == 0) { lv_coord_t text_r = inner_r - 15; lv_coord_t label_x = cx + (text_r * cos_v) / 32767; lv_coord_t label_y = cy + (text_r * sin_v) / 32767; lv_obj_t* label = lv_label_create(arc); lv_obj_set_style_text_font(label, &lv_font_din_26, 0); lv_obj_set_style_text_color(label, lv_color_hex(0xB4BCC8), 0); lv_label_set_text_fmt(label, "%d", speed); lv_obj_update_layout(label); lv_obj_set_pos(label, label_x - lv_obj_get_width(label) / 2, label_y - lv_obj_get_height(label) / 2); } lv_line_set_points(line, p, 2); } return obj; } void lv_speedmeter_set_speed(lv_obj_t* obj, float speed) { lv_speedmeter_t* self = (lv_speedmeter_t*)obj; self->speed = speed; int arc_value = (int)(self->speed / self->max_speed * 100.0); lv_arc_set_value(self->speed_arc, arc_value); lv_obj_send_event(self->speed_arc, LV_EVENT_VALUE_CHANGED, NULL); } float lv_speedmeter_get_speed(lv_obj_t* obj) { lv_speedmeter_t* self = (lv_speedmeter_t*)obj; return self->speed; } void lv_speedmeter_set_unit_label(lv_obj_t* obj, const char* label) { lv_speedmeter_t* self = (lv_speedmeter_t*)obj; lv_label_set_text(self->speed_unit_label, label); }