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Daniel Stoppek
2024-12-09 19:47:18 +01:00
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53
libraries/lvgl/examples/widgets/canvas/index.rst Normal file
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Drawing on the Canvas and rotate
--------------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_1
:language: c
Transparent Canvas with chroma keying
-------------------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_2
:language: c
Draw a rectangle to the canvas
------------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_3
:language: c
Draw a label to the canvas
--------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_4
:language: c
Draw an arc to the canvas
-------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_5
:language: c
Draw an image to the canvas
---------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_6
:language: c
Draw a line to the canvas
-------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_7
:language: c
Draw a vector graphic to the canvas
-------------------------
.. lv_example:: widgets/canvas/lv_example_canvas_8
:language: c

78
libraries/lvgl/examples/widgets/canvas/lv_example_canvas_1.c Normal file
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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

47
libraries/lvgl/examples/widgets/canvas/lv_example_canvas_2.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 80
#define CANVAS_HEIGHT 40
/**
* Create a transparent canvas with transparency
*/
void lv_example_canvas_2(void)
{
lv_obj_set_style_bg_color(lv_screen_active(), lv_palette_lighten(LV_PALETTE_RED, 5), 0);
/*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_obj_center(canvas);
/*Red background (There is no dedicated alpha channel in indexed images so LV_OPA_COVER is ignored)*/
lv_canvas_fill_bg(canvas, lv_palette_main(LV_PALETTE_BLUE), LV_OPA_COVER);
/*Create hole on the canvas*/
uint32_t x;
uint32_t y;
for(y = 10; y < 20; y++) {
for(x = 5; x < 75; x++) {
lv_canvas_set_px(canvas, x, y, lv_palette_main(LV_PALETTE_BLUE), LV_OPA_50);
}
}
for(y = 20; y < 30; y++) {
for(x = 5; x < 75; x++) {
lv_canvas_set_px(canvas, x, y, lv_palette_main(LV_PALETTE_BLUE), LV_OPA_20);
}
}
for(y = 30; y < 40; y++) {
for(x = 5; x < 75; x++) {
lv_canvas_set_px(canvas, x, y, lv_palette_main(LV_PALETTE_BLUE), LV_OPA_0);
}
}
}
#endif

44
libraries/lvgl/examples/widgets/canvas/lv_example_canvas_3.c Normal file
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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 rectangle to the canvas
*/
void lv_example_canvas_3(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_rect_dsc_t dsc;
lv_draw_rect_dsc_init(&dsc);
dsc.bg_color = lv_palette_main(LV_PALETTE_RED);
dsc.border_color = lv_palette_main(LV_PALETTE_BLUE);
dsc.border_width = 3;
dsc.outline_color = lv_palette_main(LV_PALETTE_GREEN);
dsc.outline_width = 2;
dsc.outline_pad = 2;
dsc.outline_opa = LV_OPA_50;
dsc.radius = 5;
dsc.border_width = 3;
lv_area_t coords = {10, 10, 40, 30};
lv_draw_rect(&layer, &dsc, &coords);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

39
libraries/lvgl/examples/widgets/canvas/lv_example_canvas_4.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_FONT_MONTSERRAT_18 && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 50
#define CANVAS_HEIGHT 50
/**
* Draw a text to the canvas
*/
void lv_example_canvas_4(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_label_dsc_t dsc;
lv_draw_label_dsc_init(&dsc);
dsc.color = lv_palette_main(LV_PALETTE_RED);
dsc.font = &lv_font_montserrat_18;
dsc.decor = LV_TEXT_DECOR_UNDERLINE;
dsc.text = "Hello";
lv_area_t coords = {10, 10, 30, 60};
lv_draw_label(&layer, &dsc, &coords);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

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libraries/lvgl/examples/widgets/canvas/lv_example_canvas_5.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 50
#define CANVAS_HEIGHT 50
/**
* Draw an arc to the canvas
*/
void lv_example_canvas_5(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_arc_dsc_t dsc;
lv_draw_arc_dsc_init(&dsc);
dsc.color = lv_palette_main(LV_PALETTE_RED);
dsc.width = 5;
dsc.center.x = 25;
dsc.center.y = 25;
dsc.width = 10;
dsc.radius = 15;
dsc.start_angle = 0;
dsc.end_angle = 220;
lv_draw_arc(&layer, &dsc);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

35
libraries/lvgl/examples/widgets/canvas/lv_example_canvas_6.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#define CANVAS_WIDTH 50
#define CANVAS_HEIGHT 50
/**
* Draw an image to the canvas
*/
void lv_example_canvas_6(void)
{
/*Create a buffer for the canvas*/
static uint8_t cbuf[LV_CANVAS_BUF_SIZE(CANVAS_WIDTH, CANVAS_HEIGHT, 32, LV_DRAW_BUF_STRIDE_ALIGN)];
/*Create a canvas and initialize its palette*/
lv_obj_t * canvas = lv_canvas_create(lv_screen_active());
lv_canvas_set_buffer(canvas, cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_COLOR_FORMAT_ARGB8888);
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_IMAGE_DECLARE(img_star);
lv_draw_image_dsc_t dsc;
lv_draw_image_dsc_init(&dsc);
dsc.src = &img_star;
lv_area_t coords = {10, 10, 10 + img_star.header.w - 1, 10 + img_star.header.h - 1};
lv_draw_image(&layer, &dsc, &coords);
lv_canvas_finish_layer(canvas, &layer);
}
#endif

40
libraries/lvgl/examples/widgets/canvas/lv_example_canvas_7.c Normal file
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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

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libraries/lvgl/examples/widgets/canvas/lv_example_canvas_8.c Normal file
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#include "../../lv_examples.h"
#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
#if LV_USE_VECTOR_GRAPHIC
#define CANVAS_WIDTH 150
#define CANVAS_HEIGHT 150
/**
* Draw a path to the canvas
*/
void lv_example_canvas_8(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_vector_dsc_t * dsc = lv_vector_dsc_create(&layer);
lv_vector_path_t * path = lv_vector_path_create(LV_VECTOR_PATH_QUALITY_MEDIUM);
lv_fpoint_t pts[] = {{10, 10}, {130, 130}, {10, 130}};
lv_vector_path_move_to(path, &pts[0]);
lv_vector_path_line_to(path, &pts[1]);
lv_vector_path_line_to(path, &pts[2]);
lv_vector_path_close(path);
lv_vector_dsc_set_fill_color(dsc, lv_color_make(0x00, 0x80, 0xff));
lv_vector_dsc_add_path(dsc, path);
lv_draw_vector(dsc);
lv_vector_path_delete(path);
lv_vector_dsc_delete(dsc);
lv_canvas_finish_layer(canvas, &layer);
}
#else
void lv_example_canvas_8(void)
{
/*fallback for online examples*/
lv_obj_t * label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Vector graphics is not enabled");
lv_obj_center(label);
}
#endif /*LV_USE_VECTOR_GRAPHIC*/
#endif