A39模拟器

MXC-A39/lvgl/examples/widgets/arc/index.rst

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+C
+^
+
+Simple Arc 
+""""""""""""""""
+
+.. lv_example:: widgets/arc/lv_example_arc_1
+  :language: c
+
+Loader with Arc 
+""""""""""""""""
+
+.. lv_example:: widgets/arc/lv_example_arc_2
+  :language: c
+
+MicroPython
+^^^^^^^^^^^
+
+No examples yet.

MXC-A39/lvgl/examples/widgets/arc/lv_example_arc_1.c

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+#include "../../lv_examples.h"
+
+#if LV_USE_ARC && LV_BUILD_EXAMPLES
+
+void lv_example_arc_1(void)
+{
+  /*Create an Arc*/
+  lv_obj_t * arc = lv_arc_create(lv_scr_act());
+  lv_obj_set_size(arc, 150, 150);
+  lv_arc_set_rotation(arc, 135);
+  lv_arc_set_bg_angles(arc, 0, 270);
+  lv_arc_set_value(arc, 40);
+  lv_obj_center(arc);
+}
+
+#endif

MXC-A39/lvgl/examples/widgets/arc/lv_example_arc_1.py

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+# Create style for the Arcs
+style = lv.style_t()
+lv.style_copy(style, lv.style_plain)
+style.line.color = lv.color_make(0,0,255) # Arc color
+style.line.width = 8                      # Arc width
+
+# Create an Arc
+arc = lv.arc(lv.scr_act())
+arc.set_style(lv.arc.STYLE.MAIN, style)   # Use the new style
+arc.set_angles(90, 60)
+arc.set_size(150, 150)
+arc.align(None, lv.ALIGN.CENTER, 0, 0)

MXC-A39/lvgl/examples/widgets/arc/lv_example_arc_2.c

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+#include "../../lv_examples.h"
+
+#if LV_USE_ARC && LV_BUILD_EXAMPLES
+
+static void set_angle(void * obj, int32_t v)
+{
+    lv_arc_set_value(obj, v);
+}
+
+/**
+ * Create an arc which acts as a loader.
+ */
+void lv_example_arc_2(void)
+{
+  /*Create an Arc*/
+  lv_obj_t * arc = lv_arc_create(lv_scr_act());
+  lv_arc_set_rotation(arc, 270);
+  lv_arc_set_bg_angles(arc, 0, 360);
+  lv_obj_remove_style(arc, NULL, LV_PART_KNOB);   /*Be sure the knob is not displayed*/
+  lv_obj_clear_flag(arc, LV_OBJ_FLAG_CLICKABLE);  /*To not allow adjusting by click*/
+  lv_obj_center(arc);
+
+  lv_anim_t a;
+  lv_anim_init(&a);
+  lv_anim_set_var(&a, arc);
+  lv_anim_set_exec_cb(&a, set_angle);
+  lv_anim_set_time(&a, 1000);
+  lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);    /*Just for the demo*/
+  lv_anim_set_repeat_delay(&a, 500);
+  lv_anim_set_values(&a, 0, 100);
+  lv_anim_start(&a);
+
+
+
+}
+
+#endif

MXC-A39/lvgl/examples/widgets/arc/lv_example_arc_2.py

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+# Create an arc which acts as a loader.
+class loader_arc(lv.arc):
+
+    def __init__(self, parent, color=lv.color_hex(0x000080), 
+                       width=8, style=lv.style_plain, rate=20):
+        super().__init__(parent)
+        
+        self.a = 0
+        self.rate = rate
+
+        # Create style for the Arcs
+        self.style = lv.style_t()
+        lv.style_copy(self.style, style)
+        self.style.line.color = color
+        self.style.line.width = width
+
+        # Create an Arc
+        self.set_angles(180, 180);
+        self.set_style(self.STYLE.MAIN, self.style);
+
+        # Spin the Arc
+        self.spin()
+
+    def spin(self):
+        # Create an `lv_task` to update the arc.
+        lv.task_create(self.task_cb, self.rate, lv.TASK_PRIO.LOWEST, {})
+
+    
+    # An `lv_task` to call periodically to set the angles of the arc
+    def task_cb(self, task):
+        self.a+=5;
+        if self.a >= 359: self.a = 359
+
+        if self.a < 180: self.set_angles(180-self.a, 180)
+        else: self.set_angles(540-self.a, 180)
+
+        if self.a == 359:
+            self.a = 0
+            lv.task_del(task)
+
+# Create a loader arc
+loader_arc = loader_arc(lv.scr_act())
+loader_arc.align(None, lv.ALIGN.CENTER, 0, 0)