init Files

libraries/lvgl/examples/widgets/canvas/lv_example_canvas_7.c

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+#include "../../lv_examples.h"
+#if LV_USE_CANVAS&& LV_BUILD_EXAMPLES
+
+#define CANVAS_WIDTH  50
+#define CANVAS_HEIGHT  50
+
+/**
+ * Draw a line to the canvas
+ */
+void lv_example_canvas_7(void)
+{
+    /*Create a buffer for the canvas*/
+    LV_DRAW_BUF_DEFINE_STATIC(draw_buf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
+    LV_DRAW_BUF_INIT_STATIC(draw_buf);
+
+    /*Create a canvas and initialize its palette*/
+    lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
+    lv_canvas_set_draw_buf(canvas, &draw_buf);
+    lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
+    lv_obj_center(canvas);
+
+    lv_layer_t layer;
+    lv_canvas_init_layer(canvas, &layer);
+
+    lv_draw_line_dsc_t dsc;
+    lv_draw_line_dsc_init(&dsc);
+    dsc.color = lv_palette_main(LV_PALETTE_RED);
+    dsc.width = 4;
+    dsc.round_end = 1;
+    dsc.round_start = 1;
+    dsc.p1.x = 15;
+    dsc.p1.y = 15;
+    dsc.p2.x = 35;
+    dsc.p2.y = 10;
+    lv_draw_line(&layer, &dsc);
+
+    lv_canvas_finish_layer(canvas, &layer);
+
+}
+#endif