init lvgl code
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ShallowGreen123
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LVGL.Simulator/lvgl/examples/widgets/canvas/index.rst
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13
LVGL.Simulator/lvgl/examples/widgets/canvas/index.rst
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Drawing on the Canvas and rotate
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""""""""""""""""""""""""""""""""""
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.. lv_example:: widgets/canvas/lv_example_canvas_1
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:language: c
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Transparent Canvas with chroma keying
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""""""""""""""""""""""""""""""""""""""
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.. lv_example:: widgets/canvas/lv_example_canvas_2
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:language: c
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#include "../../lv_examples.h"
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#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
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#define CANVAS_WIDTH 200
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#define CANVAS_HEIGHT 150
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void lv_example_canvas_1(void)
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{
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lv_draw_rect_dsc_t rect_dsc;
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lv_draw_rect_dsc_init(&rect_dsc);
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rect_dsc.radius = 10;
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rect_dsc.bg_opa = LV_OPA_COVER;
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rect_dsc.bg_grad.dir = LV_GRAD_DIR_HOR;
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rect_dsc.bg_grad.stops[0].color = lv_palette_main(LV_PALETTE_RED);
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rect_dsc.bg_grad.stops[1].color = lv_palette_main(LV_PALETTE_BLUE);
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rect_dsc.border_width = 2;
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rect_dsc.border_opa = LV_OPA_90;
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rect_dsc.border_color = lv_color_white();
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rect_dsc.shadow_width = 5;
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rect_dsc.shadow_ofs_x = 5;
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rect_dsc.shadow_ofs_y = 5;
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lv_draw_label_dsc_t label_dsc;
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lv_draw_label_dsc_init(&label_dsc);
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label_dsc.color = lv_palette_main(LV_PALETTE_ORANGE);
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static lv_color_t cbuf[LV_CANVAS_BUF_SIZE_TRUE_COLOR(CANVAS_WIDTH, CANVAS_HEIGHT)];
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lv_obj_t * canvas = lv_canvas_create(lv_scr_act());
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lv_canvas_set_buffer(canvas, cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_IMG_CF_TRUE_COLOR);
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lv_obj_center(canvas);
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lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 3), LV_OPA_COVER);
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lv_canvas_draw_rect(canvas, 70, 60, 100, 70, &rect_dsc);
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lv_canvas_draw_text(canvas, 40, 20, 100, &label_dsc, "Some text on text canvas");
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/*Test the rotation. It requires another buffer where the original image is stored.
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*So copy the current image to buffer and rotate it to the canvas*/
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static lv_color_t cbuf_tmp[CANVAS_WIDTH * CANVAS_HEIGHT];
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memcpy(cbuf_tmp, cbuf, sizeof(cbuf_tmp));
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lv_img_dsc_t img;
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img.data = (void *)cbuf_tmp;
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img.header.cf = LV_IMG_CF_TRUE_COLOR;
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img.header.w = CANVAS_WIDTH;
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img.header.h = CANVAS_HEIGHT;
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lv_canvas_fill_bg(canvas, lv_palette_lighten(LV_PALETTE_GREY, 3), LV_OPA_COVER);
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lv_canvas_transform(canvas, &img, 120, LV_IMG_ZOOM_NONE, 0, 0, CANVAS_WIDTH / 2, CANVAS_HEIGHT / 2, true);
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}
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#endif
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_CANVAS_WIDTH = 200
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_CANVAS_HEIGHT = 150
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LV_IMG_ZOOM_NONE = 256
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rect_dsc = lv.draw_rect_dsc_t()
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rect_dsc.init()
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rect_dsc.radius = 10
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rect_dsc.bg_opa = lv.OPA.COVER
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rect_dsc.bg_grad.dir = lv.GRAD_DIR.HOR
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rect_dsc.bg_grad.stops[0].color = lv.palette_main(lv.PALETTE.RED)
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rect_dsc.bg_grad.stops[1].color = lv.palette_main(lv.PALETTE.BLUE)
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rect_dsc.border_width = 2
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rect_dsc.border_opa = lv.OPA._90
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rect_dsc.border_color = lv.color_white()
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rect_dsc.shadow_width = 5
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rect_dsc.shadow_ofs_x = 5
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rect_dsc.shadow_ofs_y = 5
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label_dsc = lv.draw_label_dsc_t()
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label_dsc.init()
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label_dsc.color = lv.palette_main(lv.PALETTE.YELLOW)
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cbuf = bytearray(_CANVAS_WIDTH * _CANVAS_HEIGHT * 4)
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canvas = lv.canvas(lv.scr_act())
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canvas.set_buffer(cbuf, _CANVAS_WIDTH, _CANVAS_HEIGHT, lv.img.CF.TRUE_COLOR)
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canvas.center()
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canvas.fill_bg(lv.palette_lighten(lv.PALETTE.GREY, 3), lv.OPA.COVER)
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canvas.draw_rect(70, 60, 100, 70, rect_dsc)
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canvas.draw_text(40, 20, 100, label_dsc, "Some text on text canvas")
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# Test the rotation. It requires another buffer where the original image is stored.
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# So copy the current image to buffer and rotate it to the canvas
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img = lv.img_dsc_t()
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img.data = cbuf[:]
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img.header.cf = lv.img.CF.TRUE_COLOR
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img.header.w = _CANVAS_WIDTH
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img.header.h = _CANVAS_HEIGHT
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canvas.fill_bg(lv.palette_lighten(lv.PALETTE.GREY, 3), lv.OPA.COVER)
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canvas.transform(img, 30, LV_IMG_ZOOM_NONE, 0, 0, _CANVAS_WIDTH // 2, _CANVAS_HEIGHT // 2, True)
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#include "../../lv_examples.h"
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#if LV_USE_CANVAS && LV_BUILD_EXAMPLES
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#define CANVAS_WIDTH 50
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#define CANVAS_HEIGHT 50
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/**
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* Create a transparent canvas with Chroma keying and indexed color format (palette).
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*/
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void lv_example_canvas_2(void)
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{
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/*Create a button to better see the transparency*/
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lv_btn_create(lv_scr_act());
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/*Create a buffer for the canvas*/
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static lv_color_t cbuf[LV_CANVAS_BUF_SIZE_INDEXED_1BIT(CANVAS_WIDTH, CANVAS_HEIGHT)];
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/*Create a canvas and initialize its palette*/
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lv_obj_t * canvas = lv_canvas_create(lv_scr_act());
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lv_canvas_set_buffer(canvas, cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_IMG_CF_INDEXED_1BIT);
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lv_canvas_set_palette(canvas, 0, LV_COLOR_CHROMA_KEY);
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lv_canvas_set_palette(canvas, 1, lv_palette_main(LV_PALETTE_RED));
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/*Create colors with the indices of the palette*/
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lv_color_t c0;
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lv_color_t c1;
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c0.full = 0;
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c1.full = 1;
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/*Red background (There is no dedicated alpha channel in indexed images so LV_OPA_COVER is ignored)*/
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lv_canvas_fill_bg(canvas, c1, LV_OPA_COVER);
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/*Create hole on the canvas*/
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uint32_t x;
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uint32_t y;
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for(y = 10; y < 30; y++) {
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for(x = 5; x < 20; x++) {
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lv_canvas_set_px_color(canvas, x, y, c0);
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}
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}
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}
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#endif
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CANVAS_WIDTH = 50
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CANVAS_HEIGHT = 50
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LV_COLOR_CHROMA_KEY = lv.color_hex(0x00ff00)
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def LV_IMG_BUF_SIZE_ALPHA_1BIT(w, h):
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return int(((w / 8) + 1) * h)
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def LV_IMG_BUF_SIZE_INDEXED_1BIT(w, h):
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return LV_IMG_BUF_SIZE_ALPHA_1BIT(w, h) + 4 * 2
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def LV_CANVAS_BUF_SIZE_INDEXED_1BIT(w, h):
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return LV_IMG_BUF_SIZE_INDEXED_1BIT(w, h)
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#
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# Create a transparent canvas with Chroma keying and indexed color format (palette).
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#
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# Create a button to better see the transparency
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btn=lv.btn(lv.scr_act())
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# Create a buffer for the canvas
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cbuf= bytearray(LV_CANVAS_BUF_SIZE_INDEXED_1BIT(CANVAS_WIDTH, CANVAS_HEIGHT))
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# Create a canvas and initialize its palette
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canvas = lv.canvas(lv.scr_act())
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canvas.set_buffer(cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, lv.img.CF.INDEXED_1BIT)
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canvas.set_palette(0, LV_COLOR_CHROMA_KEY)
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canvas.set_palette(1, lv.palette_main(lv.PALETTE.RED))
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# Create colors with the indices of the palette
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c0 = lv.color_t()
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c1 = lv.color_t()
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c0.full = 0
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c1.full = 1
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# Red background (There is no dedicated alpha channel in indexed images so LV_OPA_COVER is ignored)
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canvas.fill_bg(c1, lv.OPA.COVER)
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# Create hole on the canvas
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for y in range(10,30):
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for x in range(5,20):
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canvas.set_px(x, y, c0)
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