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_HOR;
14 rect_dsc.bg_grad.stops[0].color = lv_palette_main(LV_PALETTE_RED);
15 rect_dsc.bg_grad.stops[1].color = lv_palette_main(LV_PALETTE_BLUE);
16 rect_dsc.border_width = 2;
17 rect_dsc.border_opa = LV_OPA_90;
18 rect_dsc.border_color = lv_color_white();
19 rect_dsc.shadow_width = 5;
20 rect_dsc.shadow_ofs_x = 5;
21 rect_dsc.shadow_ofs_y = 5;
22
23 lv_draw_label_dsc_t label_dsc;
24 lv_draw_label_dsc_init(&label_dsc);
25 label_dsc.color = lv_palette_main(LV_PALETTE_ORANGE);
26
27 static lv_color_t cbuf[LV_CANVAS_BUF_SIZE_TRUE_COLOR(CANVAS_WIDTH, CANVAS_HEIGHT)];
28
29 lv_obj_t * canvas = lv_canvas_create(lv_scr_act());
30 lv_canvas_set_buffer(canvas, cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_IMG_CF_TRUE_COLOR);
31 lv_obj_center(canvas);
32 lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 3), LV_OPA_COVER);
33
34 lv_canvas_draw_rect(canvas, 70, 60, 100, 70, &rect_dsc);
35
36 lv_canvas_draw_text(canvas, 40, 20, 100, &label_dsc, "Some text on text canvas");
37
38 /*Test the rotation. It requires another buffer where the original image is stored.
39 *So copy the current image to buffer and rotate it to the canvas*/
40 static lv_color_t cbuf_tmp[CANVAS_WIDTH * CANVAS_HEIGHT];
41 memcpy(cbuf_tmp, cbuf, sizeof(cbuf_tmp));
42 lv_img_dsc_t img;
43 img.data = (void *)cbuf_tmp;
44 img.header.cf = LV_IMG_CF_TRUE_COLOR;
45 img.header.w = CANVAS_WIDTH;
46 img.header.h = CANVAS_HEIGHT;
47
48 lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 3), LV_OPA_COVER);
49 lv_canvas_transform(canvas, &img, 120, LV_IMG_ZOOM_NONE, 0, 0, CANVAS_WIDTH / 2, CANVAS_HEIGHT / 2, true);
50 }
51
52 #endif
53
