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managed_components/lvgl__lvgl/examples/others/gestures/lv_example_gestures.c

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+/*******************************************************************
+ *
+ * @file lv_example_gestures.c
+ *
+ * This is a simple example program that demonstrates how to use
+ * the gesture recognition API, please refer to lv_indev_gesture.h or the documentation
+ * for more details
+ *
+ * The application starts with a single rectangle. The user can then
+ * - Pinch the rectangle to scale it
+ * - Rotate the rectangle to rotate it
+ * - Two fingers swipe the rectangle to see the direction and the distance of the swipe
+ *
+ * Copyright (c) 2024 EDGEMTech Ltd
+ *
+ * Author: EDGEMTech Ltd, Erik Tagirov (erik.tagirov@edgemtech.ch)
+ *
+ ******************************************************************/
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "../../lv_examples.h"
+
+#if LV_USE_GESTURE_RECOGNITION && LV_BUILD_EXAMPLES
+
+/*********************
+ *      DEFINES
+ *********************/
+
+#define RECT_INIT_WIDTH 300
+#define RECT_INIT_HEIGHT 300
+#define RECT_COLOR 0xC1BCFF
+
+#ifndef M_PI
+    #define M_PI 3.1415926f
+#endif
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+static void label_scale(lv_event_t * gesture_event);
+static void label_rotate(lv_event_t * gesture_event);
+static void label_swipe(lv_event_t * gesture_event);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+static lv_obj_t * label;
+static lv_style_t label_style;
+static uint32_t label_width;
+static uint32_t label_height;
+static uint32_t label_x;
+static uint32_t label_y;
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+
+/**
+ * Entry point it creates the screen, and the label
+ * Set event callbacks on the label
+ */
+void lv_example_gestures(void)
+{
+    lv_obj_t * root_view;
+
+    label_width = RECT_INIT_WIDTH;
+    label_height = RECT_INIT_HEIGHT;
+    label_x = LV_HOR_RES / 2 - (label_width / 2);
+    label_y = LV_VER_RES / 2 - (label_height / 2);
+
+    root_view = lv_screen_active();
+
+    lv_obj_set_style_bg_color(root_view, lv_color_hex(0xffffff), LV_PART_MAIN);
+    label = lv_label_create(root_view);
+    lv_obj_remove_flag(root_view, LV_OBJ_FLAG_SCROLLABLE);
+
+    lv_label_set_text(label, "Zoom, rotate or move");
+    lv_obj_add_flag(label, LV_OBJ_FLAG_CLICKABLE);
+
+    lv_style_init(&label_style);
+    lv_style_set_bg_color(&label_style, lv_color_hex(RECT_COLOR));
+    lv_style_set_bg_opa(&label_style, LV_OPA_COVER);
+
+    lv_style_set_width(&label_style, (int)label_width);
+    lv_style_set_height(&label_style, (int)label_height);
+
+    lv_style_set_x(&label_style, (int)label_x);
+    lv_style_set_y(&label_style, (int)label_y);
+
+    lv_obj_add_style(label, &label_style, LV_STATE_DEFAULT);
+
+    lv_obj_add_event_cb(label, label_rotate, LV_EVENT_GESTURE, label);
+    lv_obj_add_event_cb(label, label_scale, LV_EVENT_GESTURE, label);
+    lv_obj_add_event_cb(label, label_swipe, LV_EVENT_GESTURE, label);
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+/**
+ * Called when a LV_EVENT_GESTURE event occurs - update the label if the gesture is a swipe
+ * @param gesture_event             pointer to a LV_EVENT_GESTURE event
+ */
+static void label_swipe(lv_event_t * gesture_event)
+{
+
+    lv_dir_t dir;
+    lv_indev_gesture_state_t state;
+    const char * text;
+
+    if(lv_event_get_gesture_type(gesture_event) != LV_INDEV_GESTURE_TWO_FINGERS_SWIPE) {
+        return;
+    }
+
+    state = lv_event_get_gesture_state(gesture_event, LV_INDEV_GESTURE_TWO_FINGERS_SWIPE);
+    dir = lv_event_get_two_fingers_swipe_dir(gesture_event);
+
+    if(state == LV_INDEV_GESTURE_STATE_ENDED) {
+
+        text = "NONE";
+        lv_label_set_text(label, text);
+    }
+    else if(state == LV_INDEV_GESTURE_STATE_RECOGNIZED) {
+
+        switch(dir) {
+            case LV_DIR_LEFT:
+                text = "LEFT";
+                break;
+            case LV_DIR_RIGHT:
+                text = "RIGHT";
+                break;
+            case LV_DIR_TOP:
+                text = "TOP";
+                break;
+            case LV_DIR_BOTTOM:
+                text = "BOTTOM";
+                break;
+            default:
+                text = "???";
+                break;
+        }
+
+        lv_label_set_text_fmt(label, "%s - %f", text, lv_event_get_two_fingers_swipe_distance(gesture_event));
+    }
+
+}
+
+/**
+ * Called when a LV_EVENT_GESTURE event occurs - scales the label if the gesture is a pinch
+ * @param gesture_event pointer to a LV_EVENT_GESTURE event
+ */
+static void label_scale(lv_event_t * gesture_event)
+{
+
+    static int initial_w = -1;
+    static int initial_h = -1;
+    lv_indev_gesture_state_t state;
+    static lv_point_t center_pnt;
+    static float base_scale = 1.0;
+    float scale;
+    float label_width_float;
+    float label_height_float;
+
+    /* Ensure the gesture is a pinch */
+    if(lv_event_get_gesture_type(gesture_event) != LV_INDEV_GESTURE_PINCH) {
+        return;
+    }
+
+    state = lv_event_get_gesture_state(gesture_event, LV_INDEV_GESTURE_PINCH);
+
+    scale = base_scale * lv_event_get_pinch_scale(gesture_event);
+
+    /* Reset state when the gesture ended */
+    if(state == LV_INDEV_GESTURE_STATE_ENDED) {
+
+        /* Pinch gesture has ended - reset the width/height for the next pinch gesture*/
+        initial_w = -1;
+        initial_h = -1;
+
+        base_scale = scale;
+
+        return;
+    }
+
+    /* The first time the gesture is recognized, save its center */
+    if(state == LV_INDEV_GESTURE_STATE_RECOGNIZED) {
+
+        if((initial_h == -1 || initial_w == -1)) {
+
+            /* Pinch gesture has been recognized - this is the first event in a series of recognized events */
+            /* The scaling is applied relative to the original width/height of the rectangle */
+            initial_w = label_width;
+            initial_h = label_height;
+            center_pnt.x = lv_obj_get_x(label) + label_width / 2;
+            center_pnt.y = lv_obj_get_y(label) + label_height / 2;
+        }
+
+        /* The gesture is recognized, we can now use the scale */
+
+        /* Avoids a situation where the rectangle becomes too small or too big,
+        * adding limits */
+        if(scale < 0.4f) {
+            scale = 0.4f;
+        }
+        else if(scale > 2.0f) {
+            scale = 2.0f;
+        }
+
+        label_x = center_pnt.x - label_width / 2;
+        label_y = center_pnt.y - label_height / 2;
+
+        label_width_float = (float)RECT_INIT_WIDTH * scale;
+        label_height_float = (float)RECT_INIT_HEIGHT * scale;
+
+        /* Update position and size */
+        lv_style_set_width(&label_style, (int)label_width_float);
+        lv_style_set_height(&label_style, (int)label_height_float);
+        lv_style_set_x(&label_style, (int)label_x);
+        lv_style_set_y(&label_style, (int)label_y);
+
+        lv_obj_add_style(label, &label_style, LV_STATE_DEFAULT);
+
+        label_width = (int)label_width_float;
+        label_height = (int)label_height_float;
+    }
+}
+
+
+/**
+ * Called when a LV_EVENT_GESTURE event occurs - rotate the label if the gesture is a rotation
+ * @param gesture_event             pointer to a LV_EVENT_GESTURE event
+ */
+static void label_rotate(lv_event_t * gesture_event)
+{
+
+    float angle_degrees = 0.f;
+    static float start_angle = 0.f;
+    lv_indev_gesture_state_t state;
+
+    if(lv_event_get_gesture_type(gesture_event) != LV_INDEV_GESTURE_ROTATE) {
+        return;
+    }
+
+    state = lv_event_get_gesture_state(gesture_event, LV_INDEV_GESTURE_ROTATE);
+
+    /* Calculate new angle. The x10 is due to lv_obj_set_style_transform_rotation using x10 angle in parameter */
+    angle_degrees = start_angle + 10.0f * (lv_event_get_rotation(gesture_event) * 180.0f / M_PI);
+
+    /* Once the gesture ends, save the current angle to the start_angle */
+    if(state == LV_INDEV_GESTURE_STATE_ENDED) {
+
+        start_angle = angle_degrees;
+    }
+
+    /* If the gesture is recognized, rotate the label */
+    if(state == LV_INDEV_GESTURE_STATE_RECOGNIZED) {
+
+        /* Need to set the pivot to the center of the widget to not rotate
+        around the top-left corner */
+        lv_obj_set_style_transform_pivot_x(label, lv_obj_get_width(label) / 2, 0);
+        lv_obj_set_style_transform_pivot_y(label, lv_obj_get_height(label) / 2, 0);
+
+        lv_obj_set_style_transform_rotation(label, (int) angle_degrees, 0);
+    }
+
+    return;
+}
+
+#endif /* LV_USE_GESTURE_RECOGNITION && LV_USE_FLOAT */

managed_components/lvgl__lvgl/examples/others/gestures/lv_example_gestures.h

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+/*******************************************************************
+ * @file lv_example_gestures.h
+ *
+ * Copyright (c) 2024 EDGEMTech Ltd.
+ *
+ * Author: EDGEMTech Ltd, Erik Tagirov (erik.tagirov@edgemtech.ch)
+ *
+ ******************************************************************/
+
+#ifndef LV_EXAMPLE_GESTURES_H
+#define LV_EXAMPLE_GESTURES_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/* Example entry point */
+void lv_example_gestures(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_EXAMPLE_GESTURES_H*/