Module: MotionPrime::DrawBackgroundMixin

Included in:
ImageDrawElement, LabelDrawElement, ViewDrawElement
Defined in:
motion-prime/elements/draw/_draw_background_mixin.rb

Instance Method Summary collapse

Instance Method Details

#draw_background_in_context(context = nil) ⇒ Object 



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# File 'motion-prime/elements/draw/_draw_background_mixin.rb', line 3

def draw_background_in_context(context = nil)
  context ||= UIGraphicsGetCurrentContext()
  options = draw_options
  rect, background_color, border_width, border_color, border_sides, corner_radius, dashes_array, rounded_corners = options.slice(:rect, :background_color, :border_width, :border_color, :border_sides, :corner_radius, :dashes, :rounded_corners).values

  return unless background_color || border_width > 0

  inset = border_width > 0 ? (border_width - 1 )*0.5 : 0
  rect = CGRectInset(rect, -inset, -inset)

  if dashes_array
    dashes = Pointer.new(:float, dashes_array.count)
    dashes_array.each_with_index { |length, i| dashes[i] = length }
  end

  if corner_radius > 0 && !rounded_corners
    bezier_path = UIBezierPath.bezierPathWithRoundedRect rect, cornerRadius: corner_radius
    UIGraphicsPushContext(context)
    bezier_path.setLineDash(dashes, count: dashes_array.count, phase: 0) if dashes
    if border_width > 0
      bezier_path.lineWidth = border_width
      border_color.setStroke
      bezier_path.stroke
    end
    if background_color
      background_color.setFill
      bezier_path.fill
    end
    UIGraphicsPopContext()
  elsif corner_radius > 0
    CGContextSetLineDash(context, dashes_array.count, dashes, 0) if dashes
    CGContextSetLineWidth(context, border_width) if border_width > 0
    CGContextSetStrokeColorWithColor(context, border_color.uicolor.cgcolor) if border_color
    draw_rect_in_context(context, rect: rect, radius: corner_radius, rounded_corners: rounded_corners)
    CGContextSaveGState(context)
    CGContextClip(context)
    if background_color
      CGContextSetFillColorWithColor(context, background_color.uicolor.cgcolor)
      CGContextFillRect(context, rect)
    end
    CGContextRestoreGState(context)
  else
    if border_width > 0 && border_color
      CGContextSetLineDash(context, dashes_array.count, dashes, 0) if dashes
      CGContextSetLineWidth(context, border_width)
      CGContextSetStrokeColorWithColor(context, border_color.uicolor.cgcolor)

      if border_sides.present?
        points = [
          [rect.origin.x, rect.origin.y],
          [rect.origin.x + rect.size.width, rect.origin.y],
          [rect.origin.x + rect.size.width, rect.origin.y + rect.size.height],
          [rect.origin.x, rect.origin.y + rect.size.height]
        ]
        CGContextMoveToPoint(context, *points[0])
        if border_sides.include?(:top)
          CGContextAddLineToPoint(context, *points[1])
        else
          CGContextMoveToPoint(context, *points[1])
        end
        if border_sides.include?(:right)
          CGContextAddLineToPoint(context, *points[2])
        else
          CGContextMoveToPoint(context, *points[2])
        end
        if border_sides.include?(:bottom)
          CGContextAddLineToPoint(context, *points[3])
        else
          CGContextMoveToPoint(context, *points[3])
        end
        if border_sides.include?(:left)
          CGContextAddLineToPoint(context, *points[0])
        else
          CGContextMoveToPoint(context, *points[0])
        end
        CGContextStrokePath(context)
      else
        CGContextStrokeRect(context, rect)
      end
    end

    if background_color
      CGContextSetFillColorWithColor(context, background_color.uicolor.cgcolor)
      CGContextFillRect(context, rect)
    end
  end
end

#draw_rect_in_context(context, options) ⇒ Object 



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# File 'motion-prime/elements/draw/_draw_background_mixin.rb', line 91

def draw_rect_in_context(context, options)
  rect = options.fetch(:rect)
  radius = options.fetch(:radius, 0)
  rounded_corners = options[:rounded_corners] || [:top_left, :top_right, :bottom_right, :bottom_left]

  CGContextBeginPath(context)

  x_left = rect.origin.x
  x_left_center = x_left + radius
  x_right_center = x_left + rect.size.width - radius
  x_right = x_left + rect.size.width
  y_top = rect.origin.y
  y_top_center = y_top + radius
  y_bottom_center = y_top + rect.size.height - radius
  y_bottom = y_top + rect.size.height
  CGContextMoveToPoint(context, x_left, y_top_center)

  if rounded_corners.include?(:top_left)
    CGContextAddArcToPoint(context, x_left, y_top, x_left_center, y_top, radius)
  else
    CGContextAddLineToPoint(context, x_left, y_top)
  end
  CGContextAddLineToPoint(context, x_right_center, y_top)

  if rounded_corners.include?(:top_right)
    CGContextAddArcToPoint(context, x_right, y_top, x_right, y_top_center, radius)
  else
    CGContextAddLineToPoint(context, x_right, y_top)
  end
  CGContextAddLineToPoint(context, x_right, y_bottom_center)

  if rounded_corners.include?(:bottom_right)
    CGContextAddArcToPoint(context, x_right, y_bottom, x_right_center, y_bottom, radius)
  else
    CGContextAddLineToPoint(context, x_right, y_bottom)
  end
  CGContextAddLineToPoint(context, x_left_center, y_bottom)

  if rounded_corners.include?(:bottom_left)
    CGContextAddArcToPoint(context, x_left, y_bottom, x_left, y_bottom_center, radius)
  else
    CGContextAddLineToPoint(context, x_left, y_bottom)
  end
  CGContextAddLineToPoint(context, x_left, y_top_center)

  CGContextClosePath(context)
end