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113 lines
3.8 KiB
113 lines
3.8 KiB
require 'forwardable' |
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require_relative 'gradient_regex' |
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module Squib |
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module Graphics |
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# Wrapper class for the Cairo context. Private. |
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# @api private |
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class CairoContextWrapper |
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extend Forwardable |
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# :nodoc: |
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# @api private |
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attr_accessor :cairo_cxt |
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# :nodoc: |
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# @api private |
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def initialize(cairo_cxt) |
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@cairo_cxt = cairo_cxt |
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end |
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def_delegators :cairo_cxt, :save, :set_source_color, :paint, :restore, |
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:translate, :rotate, :move_to, :update_pango_layout, :width, :height, |
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:show_pango_layout, :rounded_rectangle, :set_line_width, :stroke, :fill, |
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:set_source, :scale, :render_rsvg_handle, :circle, :triangle, :line_to, |
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:operator=, :show_page, :clip, :transform, :mask, :create_pango_layout, |
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:antialias=, :curve_to, :matrix, :matrix=, :identity_matrix, :pango_layout_path, |
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:stroke_preserve, :target, :new_path, :fill_preserve, :close_path, |
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:set_line_join, :set_line_cap, :set_dash |
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# :nodoc: |
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# @api private |
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def set_source_squibcolor(arg) |
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raise 'nil is not a valid color' if arg.nil? |
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if match = arg.match(LINEAR_GRADIENT) |
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x1, y1, x2, y2 = match.captures |
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linear = Cairo::LinearPattern.new(x1.to_f, y1.to_f, x2.to_f, y2.to_f) |
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arg.scan(STOPS).each do |color, offset| |
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linear.add_color_stop(offset.to_f, color) |
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end |
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linear.matrix = matrix # match the coordinate systems - see bug 127 |
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@cairo_cxt.set_source(linear) |
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elsif match = arg.match(RADIAL_GRADIENT) |
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x1, y1, r1, x2, y2, r2 = match.captures |
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radial = Cairo::RadialPattern.new(x1.to_f, y1.to_f, r1.to_f, |
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x2.to_f, y2.to_f, r2.to_f) |
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radial.matrix = matrix # match the coordinate systems - see bug 127 |
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arg.scan(STOPS).each do |color, offset| |
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radial.add_color_stop(offset.to_f, color) |
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end |
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@cairo_cxt.set_source(radial) |
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else |
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@cairo_cxt.set_source_color(arg) |
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end |
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end |
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# Convenience method for a common task |
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# @api private |
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def fill_n_stroke(draw) |
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return stroke_n_fill(draw) if draw.stroke_strategy == :stroke_first |
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set_source_squibcolor draw.fill_color |
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fill_preserve |
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set_source_squibcolor draw.stroke_color |
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set_line_width draw.stroke_width |
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set_line_join draw.join |
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set_line_cap draw.cap |
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set_dash draw.dash |
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stroke |
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end |
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def stroke_n_fill(draw) |
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return fill_n_stroke(draw) if draw.stroke_strategy == :fill_first |
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set_source_squibcolor draw.stroke_color |
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set_line_width draw.stroke_width |
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set_line_join draw.join |
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set_line_cap draw.cap |
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set_dash draw.dash |
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stroke_preserve |
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set_source_squibcolor draw.fill_color |
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fill |
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end |
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# Convenience method for a common task |
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# @api private |
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def fancy_stroke(draw) |
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set_source_squibcolor draw.stroke_color |
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set_line_width draw.stroke_width |
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set_line_join draw.join |
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set_line_cap draw.cap |
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set_dash draw.dash |
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stroke |
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end |
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def rotate_about(x, y, angle) |
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translate(x, y) |
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rotate(angle) |
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translate(-x, -y) |
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end |
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# Flip either vertical or horizontal depending |
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# From the cairo website: http://cairographics.org/matrix_transform/ |
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# cairo.Matrix(fx, 0, 0, |
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# fy, cx*(1-fx), cy*(fy-1)) |
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# fx/fy = 1 means 'no flip', fx/fy = -1 are used for horizontal/vertical flip |
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def flip(vertical, horizontal, x, y) |
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v = vertical ? -1.0 : 1.0 |
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h = horizontal ? -1.0 : 1.0 |
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transform Cairo::Matrix.new(v, 0.0, 0.0, |
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h, x * (1 - v), y * (1 - h)) |
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end |
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end |
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end |
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end
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