init Files

libraries/lvgl/examples/libs/tiny_ttf/index.rst

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+Open a font with Tiny TTF from data array
+------------------------------------------
+
+.. lv_example:: libs/tiny_ttf/lv_example_tiny_ttf_1
+  :language: c
+
+
+Load a font with Tiny_TTF from file
+-----------------------------------
+
+.. lv_example:: libs/tiny_ttf/lv_example_tiny_ttf_2
+  :language: c
+
+Change font size with Tiny_TTF
+------------------------------
+
+.. lv_example:: libs/tiny_ttf/lv_example_tiny_ttf_3
+  :language: c

libraries/lvgl/examples/libs/tiny_ttf/lv_example_tiny_ttf.h

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+/**
+ * @file lv_example_tiny_ttf.h
+ *
+ */
+
+#ifndef LV_EXAMPLE_TINY_TTF_H
+#define LV_EXAMPLE_TINY_TTF_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void lv_example_tiny_ttf_1(void);
+void lv_example_tiny_ttf_2(void);
+void lv_example_tiny_ttf_3(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_EXAMPLE_TINY_TTF_H*/

libraries/lvgl/examples/libs/tiny_ttf/lv_example_tiny_ttf_1.c

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+#include "../../lv_examples.h"
+#if LV_USE_TINY_TTF && LV_BUILD_EXAMPLES
+
+/**
+ * Load a font with Tiny_TTF
+ */
+void lv_example_tiny_ttf_1(void)
+{
+    extern const uint8_t ubuntu_font[];
+    extern const int ubuntu_font_size;
+
+    /*Create style with the new font*/
+    static lv_style_t style;
+    lv_style_init(&style);
+    lv_font_t * font = lv_tiny_ttf_create_data(ubuntu_font, ubuntu_font_size, 30);
+    lv_style_set_text_font(&style, font);
+    lv_style_set_text_align(&style, LV_TEXT_ALIGN_CENTER);
+
+    /*Create a label with the new style*/
+    lv_obj_t * label = lv_label_create(lv_screen_active());
+    lv_obj_add_style(label, &style, 0);
+    lv_label_set_text(label, "Hello world\nI'm a font\ncreated\nwith Tiny TTF");
+    lv_obj_center(label);
+}
+#endif

libraries/lvgl/examples/libs/tiny_ttf/lv_example_tiny_ttf_2.c

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+#include "../../lv_examples.h"
+#if LV_USE_TINY_TTF && LV_TINY_TTF_FILE_SUPPORT && LV_BUILD_EXAMPLES
+
+/**
+ * Load a font with Tiny_TTF from file
+ */
+void lv_example_tiny_ttf_2(void)
+{
+    /*Create style with the new font*/
+    static lv_style_t style;
+    lv_style_init(&style);
+    lv_font_t * font = lv_tiny_ttf_create_file("A:lvgl/examples/libs/tiny_ttf/Ubuntu-Medium.ttf", 30);
+    lv_style_set_text_font(&style, font);
+    lv_style_set_text_align(&style, LV_TEXT_ALIGN_CENTER);
+
+    /*Create a label with the new style*/
+    lv_obj_t * label = lv_label_create(lv_screen_active());
+    lv_obj_add_style(label, &style, 0);
+    lv_label_set_text(label, "Hello world\nI'm a font\ncreated\nwith Tiny TTF");
+    lv_obj_center(label);
+}
+#endif

libraries/lvgl/examples/libs/tiny_ttf/lv_example_tiny_ttf_3.c

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+#include "../../lv_examples.h"
+#if LV_USE_TINY_TTF && LV_BUILD_EXAMPLES && LV_USE_OBSERVER
+
+static void font_size_observer_cb(lv_observer_t * observer, lv_subject_t * subject);
+
+static lv_subject_t subject_font;
+
+/**
+ * Change font size with Tiny_TTF
+ */
+void lv_example_tiny_ttf_3(void)
+{
+    extern const uint8_t ubuntu_font[];
+    extern const int ubuntu_font_size;
+
+    lv_subject_init_int(&subject_font, 25);
+
+    /*Create style with the new font*/
+    static lv_style_t style;
+    lv_style_init(&style);
+    lv_font_t * font = lv_tiny_ttf_create_data(ubuntu_font, ubuntu_font_size, 25);
+    lv_style_set_text_font(&style, font);
+    lv_style_set_text_align(&style, LV_TEXT_ALIGN_CENTER);
+
+    lv_obj_t * slider = lv_slider_create(lv_screen_active());
+    lv_obj_center(slider);
+    lv_slider_set_range(slider, 5, 50);
+    lv_obj_align(slider, LV_ALIGN_BOTTOM_MID, 0, -50);
+    lv_slider_bind_value(slider, &subject_font);
+
+    lv_obj_t * slider_label = lv_label_create(lv_screen_active());
+    lv_obj_align_to(slider_label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
+    lv_label_bind_text(slider_label, &subject_font, "%d");
+
+    /*Create a label with the new style*/
+    lv_obj_t * label = lv_label_create(lv_screen_active());
+    lv_obj_add_style(label, &style, 0);
+    lv_obj_set_size(label, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
+    lv_label_set_text(label, "Hello world!");
+    lv_obj_center(label);
+
+    lv_subject_add_observer(&subject_font, font_size_observer_cb, &style);
+}
+
+static void font_size_observer_cb(lv_observer_t * observer, lv_subject_t * subject)
+{
+    lv_style_t * style = lv_observer_get_user_data(observer);
+    lv_style_value_t v;
+    lv_style_get_prop(style, LV_STYLE_TEXT_FONT, &v);
+    lv_font_t * font = (lv_font_t *) v.ptr;
+    int32_t size = lv_subject_get_int(subject);
+
+    lv_tiny_ttf_set_size(font, size);
+
+    lv_obj_report_style_change(style);
+}
+#endif