Aegisub/OverLua/docs/test2.lua

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function render_frame(f, t)
--local surf = cairo.image_surface_create(200,200,"argb32")
local surf = f.create_cairo_surface()
local ctx = surf.create_context()
ctx.set_source_rgba(1, 0.5, 0.5, 0.75)
ctx.move_to(10, 10)
ctx.line_to(10, 200)
ctx.line_to(300, 10)
ctx.close_path()
ctx.fill_preserve()
ctx.set_source_rgba(0,0,0,1)
ctx.stroke()
ctx.push_group()
ctx.select_font_face("Arial", "italic", "")
ctx.set_font_size(35)
ctx.move_to(100,100)
ctx.text_path(string.format("Time: %.3fs", t))
ctx.set_source_rgba(0,1,0,0.8)
ctx.set_line_width(4)
ctx.stroke_preserve()
ctx.set_source_rgba(0,0,1,1)
ctx.fill()
ctx.pop_group_to_source()
ctx.paint_with_alpha(0.5)
f.overlay_cairo_surface(surf, 0, 0)
surf = cairo.image_surface_create(400, 200, "argb32")
ctx = surf.create_context()
ctx.select_font_face("Arial", "", "bold")
ctx.set_source_rgba(1, 1, 1, 1)
ctx.set_font_size(40)
ctx.move_to(100, 100)
ctx.text_path("OverLua")
ctx.fill()
raster.directional_blur(surf, t, 5)
f.overlay_cairo_surface(surf, 200, 50)
end