update asserts

examples/widgets/canvas/lv_example_canvas_1.c

@@ -0,0 +1,53 @@
+#include "../../../lvgl.h"
+#if LV_USE_CANVAS
+
+
+#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_HOR;
+    rect_dsc.bg_color = LV_COLOR_RED;
+    rect_dsc.bg_grad_color = LV_COLOR_BLUE;
+    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_ofs_x = 5;
+    rect_dsc.shadow_ofs_y = 5;
+
+    lv_draw_label_dsc_t label_dsc;
+    lv_draw_label_dsc_init(&label_dsc);
+    label_dsc.color = LV_COLOR_YELLOW;
+
+    static lv_color_t cbuf[LV_CANVAS_BUF_SIZE_TRUE_COLOR(CANVAS_WIDTH, CANVAS_HEIGHT)];
+
+    lv_obj_t * canvas = lv_canvas_create(lv_scr_act(), NULL);
+    lv_canvas_set_buffer(canvas, cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_IMG_CF_TRUE_COLOR);
+    lv_obj_align(canvas, NULL, LV_ALIGN_CENTER, 0, 0);
+    lv_canvas_fill_bg(canvas, LV_COLOR_SILVER, LV_OPA_COVER);
+
+    lv_canvas_draw_rect(canvas, 70, 60, 100, 70, &rect_dsc);
+
+    lv_canvas_draw_text(canvas, 40, 20, 100, &label_dsc, "Some text on text canvas");
+
+    /* Test the rotation. It requires an other buffer where the orignal image is stored.
+     * So copy the current image to buffer and rotate it to the canvas */
+    static lv_color_t cbuf_tmp[CANVAS_WIDTH * CANVAS_HEIGHT];
+    memcpy(cbuf_tmp, cbuf, sizeof(cbuf_tmp));
+    lv_img_dsc_t img;
+    img.data = (void *)cbuf_tmp;
+    img.header.cf = LV_IMG_CF_TRUE_COLOR;
+    img.header.w = CANVAS_WIDTH;
+    img.header.h = CANVAS_HEIGHT;
+
+    lv_canvas_fill_bg(canvas, LV_COLOR_SILVER, LV_OPA_COVER);
+    lv_canvas_transform(canvas, &img, 30, LV_IMG_ZOOM_NONE, 0, 0, CANVAS_WIDTH / 2, CANVAS_HEIGHT / 2, true);
+}
+
+#endif