6617385f8a
* Add dithering to gradients * Add support for 8x8 matrix for ordered dithering * Fix CI errors * Try error diffusion on vertical gradient too * Vertical error diffusion dithering * Add support for runtime based dithering mode selection (from none, ordered, error diffusion). * Reduce the binary size of the code by sharing the dithering table when appropriate. * Fix CI * Fix CI * Review corrections * Fix union mapping * Revert bg_color changes * Fix for keeping bg_color in the API. * Fix after review * Add support for setting multiple stops per gradient in the style API * Let's make an example Co-authored-by: Gabor Kiss-Vamosi <kisvegabor@gmail.com>
54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
#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 an other buffer where the orignal 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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