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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 200
#define CANVAS_HEIGHT 150
void lv_example_canvas_1(void)
{
lv_draw_rect_dsc_t rect_dsc;
lv_draw_rect_dsc_init(&rect_dsc);
rect_dsc.radius = 10;
rect_dsc.bg_opa = LV_OPA_COVER;
rect_dsc.bg_grad.dir = LV_GRAD_DIR_VER;
rect_dsc.bg_grad.stops[0].color = lv_palette_main(LV_PALETTE_RED);
rect_dsc.bg_grad.stops[0].opa = LV_OPA_100;
rect_dsc.bg_grad.stops[1].color = lv_palette_main(LV_PALETTE_BLUE);
rect_dsc.bg_grad.stops[1].opa = LV_OPA_50;
rect_dsc.border_width = 2;
rect_dsc.border_opa = LV_OPA_90;
rect_dsc.border_color = lv_color_white();
rect_dsc.shadow_width = 5;
rect_dsc.shadow_offset_x = 5;
rect_dsc.shadow_offset_y = 5;
lv_draw_label_dsc_t label_dsc;
lv_draw_label_dsc_init(&label_dsc);
label_dsc.color = lv_palette_main(LV_PALETTE_ORANGE);
label_dsc.text = "Some text on text canvas";
/*Create a buffer for the canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf_16bpp, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_RGB565);
LV_DRAW_BUF_INIT_STATIC(draw_buf_16bpp);
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf_16bpp);
lv_obj_center(canvas);
lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 3), LV_OPA_COVER);
lv_layer_t layer;
lv_canvas_init_layer(canvas, &layer);
lv_area_t coords_rect = {30, 20, 100, 70};
lv_draw_rect(&layer, &rect_dsc, &coords_rect);
lv_area_t coords_text = {40, 80, 100, 120};
lv_draw_label(&layer, &label_dsc, &coords_text);
lv_canvas_finish_layer(canvas, &layer);
/*Test the rotation. It requires another buffer where the original image is stored.
*So use previous canvas as image and rotate it to the new canvas*/
LV_DRAW_BUF_DEFINE_STATIC(draw_buf_32bpp, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
LV_DRAW_BUF_INIT_STATIC(draw_buf_32bpp);
/*Create a canvas and initialize its palette*/
canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_draw_buf(canvas, &draw_buf_32bpp);
lv_canvas_fill_bg(canvas, lv_color_hex3(0xccc), LV_OPA_COVER);
lv_obj_center(canvas);
lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 1), LV_OPA_COVER);
lv_canvas_init_layer(canvas, &layer);
lv_image_dsc_t img;
lv_draw_buf_to_image(&draw_buf_16bpp, &img);
lv_draw_image_dsc_t img_dsc;
lv_draw_image_dsc_init(&img_dsc);
img_dsc.rotation = 120;
img_dsc.src = &img;
img_dsc.pivot.x = CANVAS_WIDTH / 2;
img_dsc.pivot.y = CANVAS_HEIGHT / 2;
lv_area_t coords_img = {0, 0, CANVAS_WIDTH - 1, CANVAS_HEIGHT - 1};
lv_draw_image(&layer, &img_dsc, &coords_img);
lv_canvas_finish_layer(canvas, &layer);
}
#endif
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