Thse hashes are used to map Magick constant values to the strings used in the primitives.
Apply coordinate transformations to support scaling (s), rotation ®, and translation (t). Angles are specified in radians.
# File lib/rmagick_internal.rb, line 220 def affine(sx, rx, ry, sy, tx, ty) primitive "affine " + sprintf("%g,%g,%g,%g,%g,%g", sx, rx, ry, sy, tx, ty) end
Draw an arc.
# File lib/rmagick_internal.rb, line 225 def arc(startX, startY, endX, endY, startDegrees, endDegrees) primitive "arc " + sprintf("%g,%g %g,%g %g,%g", startX, startY, endX, endY, startDegrees, endDegrees) end
Draw a bezier curve.
# File lib/rmagick_internal.rb, line 231 def bezier(*points) if points.length == 0 Kernel.raise ArgumentError, "no points specified" elsif points.length % 2 != 0 Kernel.raise ArgumentError, "odd number of arguments specified" end primitive "bezier " + points.join(',') end
Draw a circle
# File lib/rmagick_internal.rb, line 241 def circle(originX, originY, perimX, perimY) primitive "circle " + sprintf("%g,%g %g,%g", originX, originY, perimX, perimY) end
Invoke a clip-path defined by def_clip_path.
# File lib/rmagick_internal.rb, line 246 def clip_path(name) primitive "clip-path #{name}" end
Define the clipping rule.
# File lib/rmagick_internal.rb, line 251 def clip_rule(rule) if ( not ["evenodd", "nonzero"].include?(rule.downcase) ) Kernel.raise ArgumentError, "Unknown clipping rule #{rule}" end primitive "clip-rule #{rule}" end
Define the clip units
# File lib/rmagick_internal.rb, line 259 def clip_units(unit) if ( not ["userspace", "userspaceonuse", "objectboundingbox"].include?(unit.downcase) ) Kernel.raise ArgumentError, "Unknown clip unit #{unit}" end primitive "clip-units #{unit}" end
Set color in image according to specified colorization rule. Rule is one of point, replace, floodfill, filltoborder,reset
# File lib/rmagick_internal.rb, line 268 def color(x, y, method) if ( not PAINT_METHOD_NAMES.has_key?(method.to_i) ) Kernel.raise ArgumentError, "Unknown PaintMethod: #{method}" end primitive "color #{x},#{y},#{PAINT_METHOD_NAMES[method.to_i]}" end
Specify EITHER the text decoration (none, underline, overline, line-through) OR the text solid background color (any color name or spec)
# File lib/rmagick_internal.rb, line 277 def decorate(decoration) if ( DECORATION_TYPE_NAMES.has_key?(decoration.to_i) ) primitive "decorate #{DECORATION_TYPE_NAMES[decoration.to_i]}" else primitive "decorate #{enquote(decoration)}" end end
Define a clip-path. A clip-path is a sequence of primitives bracketed by the “push clip-path <name>” and “pop clip-path” primitives. Upon advice from the IM guys, we also bracket the clip-path primitives with “push(pop) defs” and “push (pop) graphic-context”.
# File lib/rmagick_internal.rb, line 290 def define_clip_path(name) begin push('defs') push('clip-path', name) push('graphic-context') yield ensure pop('graphic-context') pop('clip-path') pop('defs') end end
Draw an ellipse
# File lib/rmagick_internal.rb, line 304 def ellipse(originX, originY, width, height, arcStart, arcEnd) primitive "ellipse " + sprintf("%g,%g %g,%g %g,%g", originX, originY, width, height, arcStart, arcEnd) end
Let anything through, but the only defined argument is “UTF-8”. All others are apparently ignored.
# File lib/rmagick_internal.rb, line 311 def encoding(encoding) primitive "encoding #{encoding}" end
Specify object fill, a color name or pattern name
# File lib/rmagick_internal.rb, line 316 def fill(colorspec) primitive "fill #{enquote(colorspec)}" end
Specify fill opacity (use “xx%” to indicate percentage)
# File lib/rmagick_internal.rb, line 323 def fill_opacity(opacity) primitive "fill-opacity #{opacity}" end
# File lib/rmagick_internal.rb, line 327 def fill_rule(rule) if ( not ["evenodd", "nonzero"].include?(rule.downcase) ) Kernel.raise ArgumentError, "Unknown fill rule #{rule}" end primitive "fill-rule #{rule}" end
Specify text drawing font
# File lib/rmagick_internal.rb, line 335 def font(name) primitive "font \'#{name}\'" end
# File lib/rmagick_internal.rb, line 339 def font_family(name) primitive "font-family \'#{name}\'" end
# File lib/rmagick_internal.rb, line 343 def font_stretch(stretch) if ( not STRETCH_TYPE_NAMES.has_key?(stretch.to_i) ) Kernel.raise ArgumentError, "Unknown stretch type" end primitive "font-stretch #{STRETCH_TYPE_NAMES[stretch.to_i]}" end
# File lib/rmagick_internal.rb, line 350 def font_style(style) if ( not STYLE_TYPE_NAMES.has_key?(style.to_i) ) Kernel.raise ArgumentError, "Unknown style type" end primitive "font-style #{STYLE_TYPE_NAMES[style.to_i]}" end
The font weight argument can be either a font weight constant or [100,200,…,900]
# File lib/rmagick_internal.rb, line 359 def font_weight(weight) if ( FONT_WEIGHT_NAMES.has_key?(weight.to_i) ) primitive "font-weight #{FONT_WEIGHT_NAMES[weight.to_i]}" else primitive "font-weight #{weight}" end end
Specify the text positioning gravity, one of: NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast
# File lib/rmagick_internal.rb, line 369 def gravity(grav) if ( not GRAVITY_NAMES.has_key?(grav.to_i) ) Kernel.raise ArgumentError, "Unknown text positioning gravity" end primitive "gravity #{GRAVITY_NAMES[grav.to_i]}" end
IM 6.5.5-8 and later
# File lib/rmagick_internal.rb, line 377 def interline_spacing(space) begin Float(space) rescue ArgumentError Kernel.raise ArgumentError, "invalid value for interline_spacing" rescue TypeError Kernel.raise TypeError, "can't convert #{space.class} into Float" end primitive "interline-spacing #{space}" end
IM 6.4.8-3 and later
# File lib/rmagick_internal.rb, line 389 def interword_spacing(space) begin Float(space) rescue ArgumentError Kernel.raise ArgumentError, "invalid value for interword_spacing" rescue TypeError Kernel.raise TypeError, "can't convert #{space.class} into Float" end primitive "interword-spacing #{space}" end
IM 6.4.8-3 and later
# File lib/rmagick_internal.rb, line 401 def kerning(space) begin Float(space) rescue ArgumentError Kernel.raise ArgumentError, "invalid value for kerning" rescue TypeError Kernel.raise TypeError, "can't convert #{space.class} into Float" end primitive "kerning #{space}" end
Draw a line
# File lib/rmagick_internal.rb, line 413 def line(startX, startY, endX, endY) primitive "line " + sprintf("%g,%g %g,%g", startX, startY, endX, endY) end
Set matte (make transparent) in image according to the specified colorization rule
# File lib/rmagick_internal.rb, line 419 def matte(x, y, method) if ( not PAINT_METHOD_NAMES.has_key?(method.to_i) ) Kernel.raise ArgumentError, "Unknown paint method" end primitive "matte #{x},#{y} #{PAINT_METHOD_NAMES[method.to_i]}" end
Specify drawing fill and stroke opacities. If the value is a string ending with a %, the number will be multiplied by 0.01.
# File lib/rmagick_internal.rb, line 428 def opacity(opacity) if (Numeric === opacity) if (opacity < 0 || opacity > 1.0) Kernel.raise ArgumentError, "opacity must be >= 0 and <= 1.0" end end primitive "opacity #{opacity}" end
Draw using SVG-compatible path drawing commands. Note that the primitive requires that the commands be surrounded by quotes or apostrophes. Here we simply use apostrophes.
# File lib/rmagick_internal.rb, line 440 def path(cmds) primitive "path '" + cmds + "'" end
Define a pattern. In the block, call primitive methods to draw the pattern. Reference the pattern by using its name as the argument to the 'fill' or 'stroke' methods
# File lib/rmagick_internal.rb, line 447 def pattern(name, x, y, width, height) begin push('defs') push("pattern #{name} #{x} #{y} #{width} #{height}") push('graphic-context') yield ensure pop('graphic-context') pop('pattern') pop('defs') end end
Set point to fill color.
# File lib/rmagick_internal.rb, line 461 def point(x, y) primitive "point #{x},#{y}" end
Specify the font size in points. Yes, the primitive is “font-size” but in other places this value is called the “pointsize”. Give it both names.
# File lib/rmagick_internal.rb, line 467 def pointsize(points) primitive "font-size #{points}" end
Draw a polygon
# File lib/rmagick_internal.rb, line 473 def polygon(*points) if points.length == 0 Kernel.raise ArgumentError, "no points specified" elsif points.length % 2 != 0 Kernel.raise ArgumentError, "odd number of points specified" end primitive "polygon " + points.join(',') end
Draw a polyline
# File lib/rmagick_internal.rb, line 483 def polyline(*points) if points.length == 0 Kernel.raise ArgumentError, "no points specified" elsif points.length % 2 != 0 Kernel.raise ArgumentError, "odd number of points specified" end primitive "polyline " + points.join(',') end
Return to the previously-saved set of whatever pop('graphic-context') (the default if no arguments) pop('defs') pop('gradient') pop('pattern')
# File lib/rmagick_internal.rb, line 498 def pop(*what) if what.length == 0 primitive "pop graphic-context" else # to_s allows a Symbol to be used instead of a String primitive "pop " + what.map {|w| w.to_s}.join(' ') end end
Push the current set of drawing options. Also you can use push('graphic-context') (the default if no arguments) push('defs') push('gradient') push('pattern')
# File lib/rmagick_internal.rb, line 512 def push(*what) if what.length == 0 primitive "push graphic-context" else # to_s allows a Symbol to be used instead of a String primitive "push " + what.map {|w| w.to_s}.join(' ') end end
Draw a rectangle
# File lib/rmagick_internal.rb, line 522 def rectangle(upper_left_x, upper_left_y, lower_right_x, lower_right_y) primitive "rectangle " + sprintf("%g,%g %g,%g", upper_left_x, upper_left_y, lower_right_x, lower_right_y) end
Specify coordinate space rotation. “angle” is measured in degrees
# File lib/rmagick_internal.rb, line 528 def rotate(angle) primitive "rotate #{angle}" end
Draw a rectangle with rounded corners
# File lib/rmagick_internal.rb, line 533 def roundrectangle(center_x, center_y, width, height, corner_width, corner_height) primitive "roundrectangle " + sprintf("%g,%g,%g,%g,%g,%g", center_x, center_y, width, height, corner_width, corner_height) end
Specify scaling to be applied to coordinate space on subsequent drawing commands.
# File lib/rmagick_internal.rb, line 539 def scale(x, y) primitive "scale #{x},#{y}" end
# File lib/rmagick_internal.rb, line 543 def skewx(angle) primitive "skewX #{angle}" end
# File lib/rmagick_internal.rb, line 547 def skewy(angle) primitive "skewY #{angle}" end
Specify the object stroke, a color name or pattern name.
# File lib/rmagick_internal.rb, line 552 def stroke(colorspec) primitive "stroke #{enquote(colorspec)}" end
Specify if stroke should be antialiased or not
# File lib/rmagick_internal.rb, line 559 def stroke_antialias(bool) bool = bool ? '1' : '0' primitive "stroke-antialias #{bool}" end
Specify a stroke dash pattern
# File lib/rmagick_internal.rb, line 565 def stroke_dasharray(*list) if list.length == 0 primitive "stroke-dasharray none" else list.each { |x| if x <= 0 then Kernel.raise ArgumentError, "dash array elements must be > 0 (#{x} given)" end } primitive "stroke-dasharray #{list.join(',')}" end end
Specify the initial offset in the dash pattern
# File lib/rmagick_internal.rb, line 579 def stroke_dashoffset(value=0) primitive "stroke-dashoffset #{value}" end
# File lib/rmagick_internal.rb, line 583 def stroke_linecap(value) if ( not ["butt", "round", "square"].include?(value.downcase) ) Kernel.raise ArgumentError, "Unknown linecap type: #{value}" end primitive "stroke-linecap #{value}" end
# File lib/rmagick_internal.rb, line 590 def stroke_linejoin(value) if ( not ["round", "miter", "bevel"].include?(value.downcase) ) Kernel.raise ArgumentError, "Unknown linejoin type: #{value}" end primitive "stroke-linejoin #{value}" end
# File lib/rmagick_internal.rb, line 597 def stroke_miterlimit(value) if (value < 1) Kernel.raise ArgumentError, "miterlimit must be >= 1" end primitive "stroke-miterlimit #{value}" end
Specify opacity of stroke drawing color
(use "xx%" to indicate percentage)
# File lib/rmagick_internal.rb, line 606 def stroke_opacity(value) primitive "stroke-opacity #{value}" end
Specify stroke (outline) width in pixels.
# File lib/rmagick_internal.rb, line 611 def stroke_width(pixels) primitive "stroke-width #{pixels}" end
Draw text at position x,y. Add quotes to text that is not already quoted.
# File lib/rmagick_internal.rb, line 616 def text(x, y, text) if text.to_s.empty? Kernel.raise ArgumentError, "missing text argument" end if text.length > 2 && /\A(?:\"[^\"]+\"|\[^\]+\|\{[^\}]+\})\z/.match(text) ; # text already quoted elsif !text['\'] text = '\'+text+'\' elsif !text['"'] text = '"'+text+'"' elsif !(text['{'] || text['}']) text = '{'+text+'}' else # escape existing braces, surround with braces text = '{' + text.gsub(/[}]/) { |b| '\' + b } + '}' end primitive "text #{x},#{y} #{text}" end
Specify text alignment relative to a given point
# File lib/rmagick_internal.rb, line 636 def text_align(alignment) if ( not ALIGN_TYPE_NAMES.has_key?(alignment.to_i) ) Kernel.raise ArgumentError, "Unknown alignment constant: #{alignment}" end primitive "text-align #{ALIGN_TYPE_NAMES[alignment.to_i]}" end
SVG-compatible version of #text_align
# File lib/rmagick_internal.rb, line 644 def text_anchor(anchor) if ( not ANCHOR_TYPE_NAMES.has_key?(anchor.to_i) ) Kernel.raise ArgumentError, "Unknown anchor constant: #{anchor}" end primitive "text-anchor #{ANCHOR_TYPE_NAMES[anchor.to_i]}" end
Specify if rendered text is to be antialiased.
# File lib/rmagick_internal.rb, line 652 def text_antialias(boolean) boolean = boolean ? '1' : '0' primitive "text-antialias #{boolean}" end
Specify color underneath text
# File lib/rmagick_internal.rb, line 658 def text_undercolor(color) primitive "text-undercolor #{enquote(color)}" end
Specify center of coordinate space to use for subsequent drawing commands.
# File lib/rmagick_internal.rb, line 664 def translate(x, y) primitive "translate #{x},#{y}" end