485 lines
16 KiB
Lua
485 lines
16 KiB
Lua
---------------------------------------------------------------------------
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--- Module dedicated to gather common shape painters.
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--
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-- It add the concept of "shape" to Awesome. A shape can be applied to a
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-- background, a margin, a mask or a drawable shape bounding.
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--
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-- The functions exposed by this module always take a context as first
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-- parameter followed by the widget and height and additional parameters.
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--
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-- The functions provided by this module only create a path in the content.
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-- to actually draw the content, use `cr:fill()`, `cr:mask()`, `cr:clip()` or
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-- `cr:stroke()`
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--
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-- In many case, it is necessary to apply the shape using a transformation
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-- such as a rotation. The preferred way to do this is to wrap the function
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-- in another function calling `cr:rotate()` (or any other transformation
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-- matrix)
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--
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-- @author Emmanuel Lepage Vallee
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-- @copyright 2011-2016 Emmanuel Lepage Vallee
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-- @release @AWESOME_VERSION@
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-- @module gears.shape
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---------------------------------------------------------------------------
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local g_matrix = require( "gears.matrix" )
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local module = {}
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--- Add a rounded rectangle to the current path.
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-- Note: If the radius is bigger than either half side, it will be reduced.
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--
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-- @DOC_gears_shape_rounded_rect_EXAMPLE@
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--
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-- @param cr A cairo content
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-- @tparam number width The rectangle width
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-- @tparam number height The rectangle height
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-- @tparam number radius the corner radius
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function module.rounded_rect(cr, width, height, radius)
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radius = radius or 10
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if width / 2 < radius then
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radius = width / 2
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end
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if height / 2 < radius then
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radius = height / 2
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end
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cr:arc( radius , radius , radius, math.pi , 3*(math.pi/2) )
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cr:arc( width-radius, radius , radius, 3*(math.pi/2), math.pi*2 )
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cr:arc( width-radius, height-radius, radius, math.pi*2 , math.pi/2 )
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cr:arc( radius , height-radius, radius, math.pi/2 , math.pi )
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cr:close_path()
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end
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--- Add a rectangle delimited by 2 180 degree arcs to the path.
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--
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-- @DOC_gears_shape_rounded_bar_EXAMPLE@
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--
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-- @param cr A cairo content
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-- @param width The rectangle width
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-- @param height The rectangle height
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function module.rounded_bar(cr, width, height)
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module.rounded_rect(cr, width, height, height / 2)
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end
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--- A rounded rect with only some of the corners rounded.
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--
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-- @DOC_gears_shape_partially_rounded_rect_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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-- @tparam boolean tl If the top left corner is rounded
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-- @tparam boolean tr If the top right corner is rounded
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-- @tparam boolean br If the bottom right corner is rounded
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-- @tparam boolean bl If the bottom left corner is rounded
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-- @tparam number rad The corner radius
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function module.partially_rounded_rect(cr, width, height, tl, tr, br, bl, rad)
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rad = rad or 10
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if width / 2 < rad then
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rad = width / 2
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end
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if height / 2 < rad then
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rad = height / 2
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end
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-- Top left
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if tl then
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cr:arc( rad, rad, rad, math.pi, 3*(math.pi/2))
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else
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cr:move_to(0,0)
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end
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-- Top right
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if tr then
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cr:arc( width-rad, rad, rad, 3*(math.pi/2), math.pi*2)
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else
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cr:line_to(width, 0)
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end
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-- Bottom right
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if br then
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cr:arc( width-rad, height-rad, rad, math.pi*2 , math.pi/2)
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else
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cr:line_to(width, height)
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end
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-- Bottom left
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if bl then
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cr:arc( rad, height-rad, rad, math.pi/2, math.pi)
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else
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cr:line_to(0, height)
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end
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cr:close_path()
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end
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--- A rounded rectangle with a triangle at the top.
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--
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-- @DOC_gears_shape_infobubble_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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-- @tparam[opt=5] number corner_radius The corner radius
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-- @tparam[opt=10] number arrow_size The width and height of the arrow
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-- @tparam[opt=width/2 - arrow_size/2] number arrow_position The position of the arrow
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function module.infobubble(cr, width, height, corner_radius, arrow_size, arrow_position)
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arrow_size = arrow_size or 10
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corner_radius = math.min((height-arrow_size)/2, corner_radius or 5)
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arrow_position = arrow_position or width/2 - arrow_size/2
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cr:move_to(0 ,corner_radius+arrow_size)
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-- Top left corner
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cr:arc(corner_radius, corner_radius+arrow_size, (corner_radius), math.pi, 3*(math.pi/2))
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-- The arrow triangle (still at the top)
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cr:line_to(arrow_position , arrow_size )
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cr:line_to(arrow_position + arrow_size , 0 )
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cr:line_to(arrow_position + 2*arrow_size , arrow_size )
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-- Complete the rounded rounded rectangle
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cr:arc(width-corner_radius, corner_radius+arrow_size , (corner_radius) , 3*(math.pi/2) , math.pi*2 )
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cr:arc(width-corner_radius, height-(corner_radius) , (corner_radius) , math.pi*2 , math.pi/2 )
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cr:arc(corner_radius , height-(corner_radius) , (corner_radius) , math.pi/2 , math.pi )
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-- Close path
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cr:close_path()
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end
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--- A rectangle terminated by an arrow.
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--
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-- @DOC_gears_shape_rectangular_tag_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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-- @tparam[opt=height/2] number arrow_length The length of the arrow part
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function module.rectangular_tag(cr, width, height, arrow_length)
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arrow_length = arrow_length or height/2
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if arrow_length > 0 then
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cr:move_to(0 , height/2 )
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cr:line_to(arrow_length , 0 )
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cr:line_to(width , 0 )
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cr:line_to(width , height )
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cr:line_to(arrow_length , height )
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else
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cr:move_to(0 , 0 )
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cr:line_to(-arrow_length, height/2 )
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cr:line_to(0 , height )
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cr:line_to(width , height )
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cr:line_to(width , 0 )
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end
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cr:close_path()
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end
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--- A simple arrow shape.
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--
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-- @DOC_gears_shape_arrow_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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-- @tparam[opt=head_width] number head_width The width of the head (/\) of the arrow
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-- @tparam[opt=width /2] number shaft_width The width of the shaft of the arrow
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-- @tparam[opt=height/2] number shaft_length The head_length of the shaft (the rest is the head)
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function module.arrow(cr, width, height, head_width, shaft_width, shaft_length)
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shaft_length = shaft_length or height / 2
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shaft_width = shaft_width or width / 2
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head_width = head_width or width
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local head_length = height - shaft_length
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cr:move_to ( width/2 , 0 )
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cr:rel_line_to( head_width/2 , head_length )
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cr:rel_line_to( -(head_width-shaft_width)/2 , 0 )
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cr:rel_line_to( 0 , shaft_length )
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cr:rel_line_to( -shaft_width , 0 )
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cr:rel_line_to( 0 , -shaft_length )
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cr:rel_line_to( -(head_width-shaft_width)/2 , 0 )
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cr:close_path()
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end
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--- A squeezed hexagon filling the rectangle.
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--
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-- @DOC_gears_shape_hexagon_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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function module.hexagon(cr, width, height)
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cr:move_to(height/2,0)
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cr:line_to(width-height/2,0)
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cr:line_to(width,height/2)
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cr:line_to(width-height/2,height)
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cr:line_to(height/2,height)
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cr:line_to(0,height/2)
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cr:line_to(height/2,0)
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cr:close_path()
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end
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--- Double arrow popularized by the vim-powerline module.
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--
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-- @DOC_gears_shape_powerline_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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-- @tparam[opt=height/2] number arrow_depth The width of the arrow part of the shape
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function module.powerline(cr, width, height, arrow_depth)
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arrow_depth = arrow_depth or height/2
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local offset = 0
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-- Avoid going out of the (potential) clip area
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if arrow_depth < 0 then
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width = width + 2*arrow_depth
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offset = -arrow_depth
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end
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cr:move_to(offset , 0 )
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cr:line_to(offset + width - arrow_depth , 0 )
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cr:line_to(offset + width , height/2 )
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cr:line_to(offset + width - arrow_depth , height )
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cr:line_to(offset , height )
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cr:line_to(offset + arrow_depth , height/2 )
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cr:close_path()
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end
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--- An isosceles triangle.
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--
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-- @DOC_gears_shape_isosceles_triangle_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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function module.isosceles_triangle(cr, width, height)
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cr:move_to( width/2, 0 )
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cr:line_to( width , height )
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cr:line_to( 0 , height )
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cr:close_path()
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end
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--- A cross (**+**) symbol.
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--
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-- @DOC_gears_shape_cross_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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-- @tparam[opt=width/3] number thickness The cross section thickness
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function module.cross(cr, width, height, thickness)
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thickness = thickness or width/3
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local xpadding = (width - thickness) / 2
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local ypadding = (height - thickness) / 2
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cr:move_to(xpadding, 0)
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cr:line_to(width - xpadding, 0)
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cr:line_to(width - xpadding, ypadding)
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cr:line_to(width , ypadding)
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cr:line_to(width , height-ypadding)
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cr:line_to(width - xpadding, height-ypadding)
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cr:line_to(width - xpadding, height )
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cr:line_to(xpadding , height )
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cr:line_to(xpadding , height-ypadding)
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cr:line_to(0 , height-ypadding)
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cr:line_to(0 , ypadding )
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cr:line_to(xpadding , ypadding )
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cr:close_path()
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end
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--- A similar shape to the `rounded_rect`, but with sharp corners.
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--
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-- @DOC_gears_shape_octogon_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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-- @tparam number corner_radius
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function module.octogon(cr, width, height, corner_radius)
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corner_radius = corner_radius or math.min(10, math.min(width, height)/4)
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local offset = math.sqrt( (corner_radius*corner_radius) / 2 )
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cr:move_to(offset, 0)
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cr:line_to(width-offset, 0)
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cr:line_to(width, offset)
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cr:line_to(width, height-offset)
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cr:line_to(width-offset, height)
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cr:line_to(offset, height)
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cr:line_to(0, height-offset)
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cr:line_to(0, offset)
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cr:close_path()
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end
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--- A circle shape.
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--
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-- @DOC_gears_shape_circle_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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function module.circle(cr, width, height)
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local size = math.min(width, height) / 2
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cr:arc(width / 2, height / 2, size, 0, 2*math.pi)
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cr:close_path()
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end
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--- A simple rectangle.
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--
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-- @DOC_gears_shape_rectangle_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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function module.rectangle(cr, width, height)
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cr:rectangle(0, 0, width, height)
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end
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--- A diagonal parallelogram with the bottom left corner at x=0 and top right
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-- at x=width.
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--
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-- @DOC_gears_shape_parallelogram_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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-- @tparam[opt=width/3] number base_width The parallelogram base width
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function module.parallelogram(cr, width, height, base_width)
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base_width = base_width or width/3
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cr:move_to(width-base_width, 0 )
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cr:line_to(width , 0 )
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cr:line_to(base_width , height )
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cr:line_to(0 , height )
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cr:close_path()
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end
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--- A losange.
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--
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-- @DOC_gears_shape_losange_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number width The shape width
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-- @tparam number height The shape height
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function module.losange(cr, width, height)
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cr:move_to(width/2 , 0 )
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cr:line_to(width , height/2 )
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cr:line_to(width/2 , height )
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cr:line_to(0 , height/2 )
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cr:close_path()
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end
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--- A partial rounded bar. How much of the rounded bar is visible depends on
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-- the given percentage value.
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--
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-- Note that this shape is not closed and thus filling it doesn't make much
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-- sense.
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--
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-- @DOC_gears_shape_radial_progress_EXAMPLE@
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--
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-- @param cr A cairo context
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-- @tparam number w The shape width
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-- @tparam number h The shape height
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-- @tparam number percent The progressbar percent
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-- @tparam boolean hide_left Do not draw the left side of the shape
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function module.radial_progress(cr, w, h, percent, hide_left)
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percent = percent or 1
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local total_length = (2*(w-h))+2*((h/2)*math.pi)
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local bar_percent = (w-h)/total_length
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local arc_percent = ((h/2)*math.pi)/total_length
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-- Bottom line
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if percent > bar_percent then
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cr:move_to(h/2,h)
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cr:line_to((h/2) + (w-h),h)
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cr:stroke()
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elseif percent < bar_percent then
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cr:move_to(h/2,h)
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cr:line_to(h/2+(total_length*percent),h)
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cr:stroke()
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end
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-- Right arc
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if percent >= bar_percent+arc_percent then
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cr:arc(w-h/2 , h/2, h/2,3*(math.pi/2),math.pi/2)
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cr:stroke()
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elseif percent > bar_percent and percent < bar_percent+(arc_percent/2) then
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cr:arc(w-h/2 , h/2, h/2,(math.pi/2)-((math.pi/2)*((percent-bar_percent)/(arc_percent/2))),math.pi/2)
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cr:stroke()
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elseif percent >= bar_percent+arc_percent/2 and percent < bar_percent+arc_percent then
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cr:arc(w-h/2 , h/2, h/2,0,math.pi/2)
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cr:stroke()
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local add = (math.pi/2)*((percent-bar_percent-arc_percent/2)/(arc_percent/2))
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cr:arc(w-h/2 , h/2, h/2,2*math.pi-add,0)
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cr:stroke()
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end
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-- Top line
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if percent > 2*bar_percent+arc_percent then
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cr:move_to((h/2) + (w-h),0)
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cr:line_to(h/2,0)
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cr:stroke()
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elseif percent > bar_percent+arc_percent and percent < 2*bar_percent+arc_percent then
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cr:move_to((h/2) + (w-h),0)
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cr:line_to(((h/2) + (w-h))-total_length*(percent-bar_percent-arc_percent),0)
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cr:stroke()
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end
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-- Left arc
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if not hide_left then
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if percent > 0.985 then
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cr:arc(h/2, h/2, h/2,math.pi/2,3*(math.pi/2))
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cr:stroke()
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elseif percent > 2*bar_percent+arc_percent then
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local relpercent = (percent - 2*bar_percent - arc_percent)/arc_percent
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cr:arc(h/2, h/2, h/2,3*(math.pi/2)-(math.pi)*relpercent,3*(math.pi/2))
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cr:stroke()
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end
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end
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end
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--- Adjust the shape using a transformation object
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--
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-- Apply various transformations to the shape
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--
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-- @usage gears.shape.transform(gears.shape.rounded_bar)
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-- : rotate(math.pi/2)
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-- : translate(10, 10)
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--
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-- @param shape A shape function
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-- @return A transformation handle, also act as a shape function
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function module.transform(shape)
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-- Apply the transformation matrix and apply the shape, then restore
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local function apply(self, cr, width, height, ...)
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cr:save()
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cr:transform(self.matrix:to_cairo_matrix())
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shape(cr, width, height, ...)
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cr:restore()
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end
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-- Redirect function calls like :rotate() to the underlying matrix
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local function index(_, key)
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return function(self, ...)
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self.matrix = self.matrix[key](self.matrix, ...)
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return self
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end
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end
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local result = setmetatable({
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matrix = g_matrix.identity
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}, {
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__call = apply,
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__index = index
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})
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return result
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end
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return module
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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