mirror of
https://github.com/lvgl/lvgl.git
synced 2025-01-28 07:03:00 +08:00
64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
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MASK_WIDTH = 100
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MASK_HEIGHT = 45
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def add_mask_event_cb(e,mask_map):
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code = e.get_code()
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obj = e.get_target_obj()
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if code == lv.EVENT.COVER_CHECK :
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e.set_cover_res(lv.COVER_RES.MASKED)
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elif code == lv.EVENT.DRAW_MAIN_BEGIN:
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m = lv.draw_mask_map_param_t()
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obj_coords = lv.area_t()
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obj.get_coords(obj_coords)
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m.init(obj_coords, mask_map)
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mask_id = lv.draw_mask_add(m,None)
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elif code == lv.EVENT.DRAW_MAIN_END:
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try:
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m.free_param()
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mask_id.remove_id()
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except:
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pass
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#
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# Draw label with gradient color
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#
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# Create the mask of a text by drawing it to a canvas
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mask_map = bytearray(MASK_WIDTH * MASK_HEIGHT * 4)
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# Create a "8 bit alpha" canvas and clear it
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canvas = lv.canvas(lv.scr_act())
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canvas.set_buffer(mask_map, MASK_WIDTH, MASK_HEIGHT, lv.COLOR_FORMAT.NATIVE)
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canvas.fill_bg(lv.color_black(), lv.OPA.TRANSP)
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# Draw a label to the canvas. The result "image" will be used as mask
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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.color_white()
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label_dsc.align = lv.TEXT_ALIGN.CENTER
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canvas.draw_text(5, 5, MASK_WIDTH, label_dsc, "Text with gradient")
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# The mask is reads the canvas is not required anymore
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canvas.delete()
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# Convert the mask to A8
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# This is just a work around and will be changed later
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mask8 = bytearray(MASK_WIDTH * MASK_HEIGHT)
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for i in range(MASK_WIDTH * MASK_HEIGHT):
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#mask8[i] = lv.color_brightness(mask_c[i]);
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mask8[i] = mask_map[4*i]
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# Create an object from where the text will be masked out.
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# Now it's a rectangle with a gradient but it could be an image too
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grad = lv.obj(lv.scr_act())
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grad.set_size( MASK_WIDTH, MASK_HEIGHT)
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grad.center()
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grad.set_style_bg_color(lv.color_hex(0xff0000), 0)
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grad.set_style_bg_grad_color(lv.color_hex(0x0000ff), 0)
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grad.set_style_bg_grad_dir(lv.GRAD_DIR.HOR, 0)
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grad.add_event(lambda e: add_mask_event_cb(e,mask8), lv.EVENT.ALL, None)
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