update asserts

examples/widgets/canvas/lv_example_canvas_1.py

@@ -0,0 +1,38 @@
+CANVAS_WIDTH  = 200
+CANVAS_HEIGHT = 150
+
+style = lv.style_t()
+lv.style_copy(style, lv.style_plain)
+style.body.main_color = lv.color_make(0xFF,0,0)
+style.body.grad_color = lv.color_make(0x80,0,0)
+style.body.radius = 4
+style.body.border.width = 2
+style.body.border.color = lv.color_make(0xFF,0xFF,0xFF)
+style.body.shadow.color = lv.color_make(0xFF,0xFF,0xFF)
+style.body.shadow.width = 4
+style.line.width = 2
+style.line.color = lv.color_make(0,0,0)
+style.text.color = lv.color_make(0,0,0xFF)
+
+# CF.TRUE_COLOR requires 4 bytes per pixel
+cbuf = bytearray(CANVAS_WIDTH * CANVAS_HEIGHT * 4)
+
+canvas = lv.canvas(lv.scr_act())
+canvas.set_buffer(cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, lv.img.CF.TRUE_COLOR)
+canvas.align(None, lv.ALIGN.CENTER, 0, 0)
+canvas.fill_bg(lv.color_make(0xC0, 0xC0, 0xC0))
+
+canvas.draw_rect(70, 60, 100, 70, style)
+
+canvas.draw_text(40, 20, 100, style, "Some text on text canvas", lv.label.ALIGN.LEFT)
+
+# 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
+img = lv.img_dsc_t()
+img.data = cbuf[:]
+img.header.cf = lv.img.CF.TRUE_COLOR
+img.header.w = CANVAS_WIDTH
+img.header.h = CANVAS_HEIGHT
+
+canvas.fill_bg(lv.color_make(0xC0, 0xC0, 0xC0))
+canvas.rotate(img, 30, 0, 0, CANVAS_WIDTH // 2, CANVAS_HEIGHT // 2)