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Add method for rotation around the center #65 #66

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3 changes: 3 additions & 0 deletions README.markdown
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Original file line number Diff line number Diff line change
Expand Up @@ -308,6 +308,9 @@ is used to specify inputs and results for filter effects
rotates the coordinate system by r degrees, end with Gend().
<http://www.w3.org/TR/SVG11/coords.html#TransformAttribute>

RotateCenter(r float64, x, y int)
rotates arount the center coordinate system by r degrees, end with Gend()

TranslateRotate(x, y int, r float64)
translates the coordinate system to (x,y), then rotates to r degrees, end with Gend().

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6 changes: 6 additions & 0 deletions svg.go
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Expand Up @@ -196,6 +196,9 @@ func (svg *SVG) SkewXY(ax, ay float64) { svg.Gtransform(skewX(ax) + " " + skewY(
// Standard Reference: http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
func (svg *SVG) Rotate(r float64) { svg.Gtransform(rotate(r)) }

// RotateCenter rotates arount the center coordinate system by r degrees, end with Gend()
func (svg *SVG) RotateCenter(r float64, x, y int) { svg.Gtransform(rotateCenter(r, x, y)) }

// TranslateRotate translates the coordinate system to (x,y), then rotates to r degrees, end with Gend()
func (svg *SVG) TranslateRotate(x, y int, r float64) {
svg.Gtransform(translate(x, y) + " " + rotate(r))
Expand Down Expand Up @@ -1020,6 +1023,9 @@ func skewY(angle float64) string { return fmt.Sprintf(`skewY(%g)`, angle) }
// rotate returns the rotate string for the transform
func rotate(r float64) string { return fmt.Sprintf(`rotate(%g)`, r) }

// rotateCenter returns the rotate string for the transform
func rotateCenter(r float64, x, y int) string { return fmt.Sprintf(rotate(%g %d %d), r, x, y) }

// translate returns the translate string for the transform
func translate(x, y int) string { return fmt.Sprintf(`translate(%d,%d)`, x, y) }

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