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83 lines
1.9 KiB
83 lines
1.9 KiB
Point = Struct.new(:x, :y)
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Rect = Struct.new(:x, :y, :width, :height)
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module GaugeHelper
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def outer_radius
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100
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end
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def inner_radius
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50
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end
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def stroke_width
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1
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end
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def key_benchmark_indicator_gutter
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10
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end
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def viewbox
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x = arc_center.x - (outer_radius + stroke_width)
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y = arc_center.y - (outer_radius + stroke_width) - key_benchmark_indicator_gutter
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width = 2 * (outer_radius + stroke_width)
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height = outer_radius + 2 * stroke_width + key_benchmark_indicator_gutter
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Rect.new(x, y, width, height)
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end
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def arc_center
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Point.new(0, 0)
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end
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def arc_radius(radius)
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"#{radius} #{radius}"
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end
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def angle_for(percentage:)
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-Math::PI * (1 - percentage)
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end
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def arc_end_point_for(radius:, percentage:)
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angle = angle_for(percentage: percentage)
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x = arc_center.x + radius * Math.cos(angle)
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y = arc_center.y + radius * Math.sin(angle)
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Point.new(x, y)
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end
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def arc_end_line_destination(radius:, percentage:)
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x = arc_center.x + radius * Math.cos(angle_for(percentage: percentage))
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y = arc_center.y + radius * Math.sin(angle_for(percentage: percentage))
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Point.new(x, y)
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end
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def arc_start_point
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Point.new(arc_center.x - outer_radius, arc_center.y)
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end
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def move_to(point:)
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"M #{coordinates_for(point)}"
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end
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def draw_arc(radius:, percentage:, clockwise:)
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sweep_flag = clockwise ? 1 : 0
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"A #{arc_radius(radius)} 0 0 #{sweep_flag} #{coordinates_for(arc_end_point_for(radius: radius,
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percentage: percentage))}"
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end
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def draw_line_to(point:)
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"L #{coordinates_for(point)}"
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end
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def benchmark_line_point(radius, angle)
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x = (radius * Math.cos(angle)).to_s
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y = (radius * Math.sin(angle) + arc_center.y).to_s
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Point.new(x, y)
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end
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def coordinates_for(point)
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"#{point.x} #{point.y}"
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end
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end
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