1 #include "../../lv_examples.h"
2 #if LV_USE_CANVAS && LV_BUILD_EXAMPLES
3
4 #define CANVAS_WIDTH 200
5 #define CANVAS_HEIGHT 150
6
lv_example_canvas_1(void)7 void lv_example_canvas_1(void)
8 {
9 lv_draw_rect_dsc_t rect_dsc;
10 lv_draw_rect_dsc_init(&rect_dsc);
11 rect_dsc.radius = 10;
12 rect_dsc.bg_opa = LV_OPA_COVER;
13 rect_dsc.bg_grad.dir = LV_GRAD_DIR_VER;
14 rect_dsc.bg_grad.stops[0].color = lv_palette_main(LV_PALETTE_RED);
15 rect_dsc.bg_grad.stops[0].opa = LV_OPA_100;
16 rect_dsc.bg_grad.stops[1].color = lv_palette_main(LV_PALETTE_BLUE);
17 rect_dsc.bg_grad.stops[1].opa = LV_OPA_50;
18 rect_dsc.border_width = 2;
19 rect_dsc.border_opa = LV_OPA_90;
20 rect_dsc.border_color = lv_color_white();
21 rect_dsc.shadow_width = 5;
22 rect_dsc.shadow_offset_x = 5;
23 rect_dsc.shadow_offset_y = 5;
24
25 lv_draw_label_dsc_t label_dsc;
26 lv_draw_label_dsc_init(&label_dsc);
27 label_dsc.color = lv_palette_main(LV_PALETTE_ORANGE);
28 label_dsc.text = "Some text on text canvas";
29 /*Create a buffer for the canvas*/
30 LV_DRAW_BUF_DEFINE_STATIC(draw_buf_16bpp, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_RGB565);
31 LV_DRAW_BUF_INIT_STATIC(draw_buf_16bpp);
32
33 lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
34 lv_canvas_set_draw_buf(canvas, &draw_buf_16bpp);
35 lv_obj_center(canvas);
36 lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 3), LV_OPA_COVER);
37
38 lv_layer_t layer;
39 lv_canvas_init_layer(canvas, &layer);
40
41 lv_area_t coords_rect = {30, 20, 100, 70};
42 lv_draw_rect(&layer, &rect_dsc, &coords_rect);
43
44 lv_area_t coords_text = {40, 80, 100, 120};
45 lv_draw_label(&layer, &label_dsc, &coords_text);
46
47 lv_canvas_finish_layer(canvas, &layer);
48
49 /*Test the rotation. It requires another buffer where the original image is stored.
50 *So use previous canvas as image and rotate it to the new canvas*/
51 LV_DRAW_BUF_DEFINE_STATIC(draw_buf_32bpp, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
52 LV_DRAW_BUF_INIT_STATIC(draw_buf_32bpp);
53
54 /*Create a canvas and initialize its palette*/
55 canvas = lv_canvas_create(lv_screen_active());
56 lv_canvas_set_draw_buf(canvas, &draw_buf_32bpp);
57 lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
58 lv_obj_center(canvas);
59
60 lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 1), LV_OPA_COVER);
61
62 lv_canvas_init_layer(canvas, &layer);
63 lv_image_dsc_t img;
64 lv_draw_buf_to_image(&draw_buf_16bpp, &img);
65 lv_draw_image_dsc_t img_dsc;
66 lv_draw_image_dsc_init(&img_dsc);
67 img_dsc.rotation = 120;
68 img_dsc.src = &img;
69 img_dsc.pivot.x = CANVAS_WIDTH / 2;
70 img_dsc.pivot.y = CANVAS_HEIGHT / 2;
71
72 lv_area_t coords_img = {0, 0, CANVAS_WIDTH - 1, CANVAS_HEIGHT - 1};
73 lv_draw_image(&layer, &img_dsc, &coords_img);
74
75 lv_canvas_finish_layer(canvas, &layer);
76 }
77
78 #endif
79
