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This specification defines the features and syntax for Magick Vector Graphics (MVG), a modularized language for describing two-dimensional vector and mixed vector/raster graphics in ImageMagick. You can use the language to draw from the command line, from an MVG file, from an SVG -- Scalable Vector Graphics file or from one of the ImageMagick program interfaces. Use this command, for example, to render an arc:
convert -size 100x60 xc:skyblue -fill white -stroke black \
-draw "path 'M 30,40 A 30,20 20 0,0 70,20 A 30,20 20 1,0 30,40 Z '" \
arc.png
and here is the results:
When the drawing gets sufficiently complex, we recommend you assemble the graphic primitives into a MVG file. For our example, we use piechart.mvg to render a pie chart with this command: convert piechart.mvg piechart.png which produces this rendering:
However, in general, MVG is sufficiently difficult to work with that you probably want to use a program to generate your graphics in the SVG format. ImageMagick automatically converts SVG to MVG and renders your image, for example, we render piechart.svg with this command: convert piechart.svg piechart.jpg to produce the same pie chart we created with the the MVG language. Drawing is available from many of the ImageMagick program interfaces as well. ImageMagick converts the drawing API calls to MVG and renders it. Here is example code written in the MagickWand language:
(void) PushDrawingWand(draw_wand);
{
const PointInfo points[6] =
{
{ 180,504 },
{ 282.7,578.6 },
{ 243.5,699.4 },
{ 116.5,699.4 },
{ 77.26,578.6 },
{ 180,504 }
};
DrawSetStrokeAntialias(draw_wand,True);
DrawSetStrokeWidth(draw_wand,9);
DrawSetStrokeLineCap(draw_wand,RoundCap);
DrawSetStrokeLineJoin(draw_wand,RoundJoin);
(void) DrawSetStrokeDashArray(draw_wand,0,(const double *)NULL);
(void) PixelSetColor(color,"#4000c2");
DrawSetStrokeColor(draw_wand,color);
DrawSetFillRule(draw_wand,EvenOddRule);
(void) PixelSetColor(color,"#800000");
DrawSetFillColor(draw_wand,color);
DrawPolygon(draw_wand,6,points);
}
(void) PopDrawingWand(draw_wand);
MVG ignores all white-space between commands. This allows multiple MVG commands per line. It is common convention to terminate each MVG command with a new line to make MVG easier to edit and read. This syntax description uses indentation in MVG sequences to aid with understanding. Indentation is supported but is not required. Metafile wrapper syntax (to support stand-alone MVG files):
push graphic-context
viewbox 0 0 width height
[ any other MVG commands ]
pop graphic-context
Pattern syntax (saving and restoring context):
push pattern id x,y width,height
push graphic-context
[ drawing commands ]
pop graphic-context
pop pattern
an example is (%s is a identifier string):
push defs
push pattern %s 10,10 20,20
push graphic-context
fill red
rectangle 5,5 15,15
pop graphic-context
push graphic-context
fill green
rectangle 10,10 20,20
pop graphic-context
pop pattern
pop defs
For image tiling use: push pattern id x,y width,height image Copy ... pop pattern Note you can use the pattern for either the fill or stroke like: stroke url(#%s) or fill url(#%s) The clip path defines a clipping area, where only the contained area to be drawn upon. Areas outside of the clipping area are masked.
push defs
push clip-path %s
push graphic-context
rectangle 10,10 20,20
pop graphic-context
pop clip-path
pop defs
clip-path url(#%s)
Here is a complete description of the MVG drawing primitives: Choose from these rule types: evenodd nonzero Choose from these unit types: userSpace userSpaceOnUse objectBoundingBox Choose from these method types: point replace floodfill filltoborder reset Choose from these types of decorations: none line-through overline underline Choose from any of these colors. The opacity ranges from 0.0 (fully opaque) to 1.0 (fully transparent) or as a percentage (e.g. 50%). Choose from these rule types: evenodd nonzero Choose from these stretch types: all normal ultra-condensed extra-condensed condensed semi-condensed semi-expanded expanded extra-expanded ultra-expanded Choose from these styles: all normal italic oblique Choose from these weights: all normal bold 100 200 300 400 500 600 700 800 900 Choose from these units: userSpace userSpaceOnUse objectBoundingBox Choose from these gravity types: NorthWest North NorthEast West Center East SouthWest South SouthEast Choose from these compose operations: Add Atop Bumpmap Clear CopyBlue CopyGreen CopyOpacity CopyRed Copy Difference In Minus Multiply Out Over Plus Subtract Xor Choose from these methods: point replace floodfill filltoborder reset Use percent (e.g. 50%). Choose from these cap types: butt round square Choose from these join types: butt miter round square |
