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220
svg/svg.go
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220
svg/svg.go
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package svg
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/beevik/etree"
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)
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// AddShadow adds a definition of a shadow to the <defs> with the given id.
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func AddShadow(element *etree.Element, id string, x, y, blur float64) {
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f := etree.NewElement("filter")
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f.CreateAttr("id", id)
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f.CreateAttr("filterUnits", "userSpaceOnUse")
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b := etree.NewElement("feGaussianBlur")
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b.CreateAttr("in", "SourceAlpha")
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b.CreateAttr("stdDeviation", fmt.Sprintf("%.2f", blur))
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o := etree.NewElement("feOffset")
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o.CreateAttr("result", "offsetblur")
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o.CreateAttr("dx", fmt.Sprintf("%.2f", x))
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o.CreateAttr("dy", fmt.Sprintf("%.2f", y))
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m := etree.NewElement("feMerge")
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mn1 := etree.NewElement("feMergeNode")
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mn2 := etree.NewElement("feMergeNode")
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mn2.CreateAttr("in", "SourceGraphic")
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m.AddChild(mn1)
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m.AddChild(mn2)
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f.AddChild(b)
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f.AddChild(o)
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f.AddChild(m)
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defs := etree.NewElement("defs")
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defs.AddChild(f)
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element.AddChild(defs)
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}
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// AddClipPath adds a definition of a clip path to the <defs> with the given id.
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func AddClipPath(element *etree.Element, id string, x, y, w, h float64) {
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p := etree.NewElement("clipPath")
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p.CreateAttr("id", id)
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rect := etree.NewElement("rect")
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rect.CreateAttr("x", fmt.Sprintf("%.2f", x))
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rect.CreateAttr("y", fmt.Sprintf("%.2f", y))
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rect.CreateAttr("width", fmt.Sprintf("%.2f", w))
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rect.CreateAttr("height", fmt.Sprintf("%.2f", h))
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p.AddChild(rect)
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defs := etree.NewElement("defs")
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defs.AddChild(p)
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element.AddChild(defs)
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}
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// AddCornerRadius adds corner radius to an element.
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func AddCornerRadius(e *etree.Element, radius float64) {
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e.CreateAttr("rx", fmt.Sprintf("%.2f", radius))
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e.CreateAttr("ry", fmt.Sprintf("%.2f", radius))
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}
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// Move moves the given element to the (x, y) position.
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func Move(e *etree.Element, x, y float64) {
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e.CreateAttr("x", fmt.Sprintf("%.2fpx", x))
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e.CreateAttr("y", fmt.Sprintf("%.2fpx", y))
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}
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// AddOutline adds an outline to the given element.
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func AddOutline(e *etree.Element, width float64, color string) {
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e.CreateAttr("stroke", color)
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e.CreateAttr("stroke-width", fmt.Sprintf("%.2f", width))
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}
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const (
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red string = "#FF5A54"
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yellow string = "#E6BF29"
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green string = "#52C12B"
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)
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// NewWindowControls returns a colorful window bar element.
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func NewWindowControls(r float64, x, y float64) *etree.Element {
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bar := etree.NewElement("svg")
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for i, color := range []string{red, yellow, green} {
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circle := etree.NewElement("circle")
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circle.CreateAttr("cx", fmt.Sprintf("%.2f", float64(i+1)*float64(x)-float64(r)))
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circle.CreateAttr("cy", fmt.Sprintf("%.2f", y))
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circle.CreateAttr("r", fmt.Sprintf("%.2f", r))
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circle.CreateAttr("fill", color)
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bar.AddChild(circle)
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}
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return bar
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}
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// SetDimensions sets the width and height of the given element.
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func SetDimensions(element *etree.Element, width, height float64) {
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widthAttr := element.SelectAttr("width")
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heightAttr := element.SelectAttr("height")
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if heightAttr != nil {
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heightAttr.Value = fmt.Sprintf("%.2f", height)
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}
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if widthAttr != nil {
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widthAttr.Value = fmt.Sprintf("%.2f", width)
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}
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}
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// GetDimensions returns the width and height of the element.
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func GetDimensions(element *etree.Element) (int, int) {
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widthValue := element.SelectAttrValue("width", "0px")
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heightValue := element.SelectAttrValue("height", "0px")
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width := dimensionToInt(widthValue)
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height := dimensionToInt(heightValue)
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return width, height
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}
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// dimensionToInt converts dimension strings to integers
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func dimensionToInt(dimension string) int {
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dimension = strings.TrimSuffix(dimension, "px")
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val, err := strconv.Atoi(dimension)
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if err != nil {
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return 0
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}
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return val
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}
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// CreateSVGElement creates a new SVG root element with basic attributes
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func CreateSVGElement(width, height float64) *etree.Element {
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svg := etree.NewElement("svg")
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svg.CreateAttr("xmlns", "http://www.w3.org/2000/svg")
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svg.CreateAttr("width", fmt.Sprintf("%.2f", width))
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svg.CreateAttr("height", fmt.Sprintf("%.2f", height))
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svg.CreateAttr("viewBox", fmt.Sprintf("0 0 %.2f %.2f", width, height))
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return svg
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}
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// CreateRect creates a rectangle element
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func CreateRect(x, y, width, height float64, fill string) *etree.Element {
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rect := etree.NewElement("rect")
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rect.CreateAttr("x", fmt.Sprintf("%.2f", x))
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rect.CreateAttr("y", fmt.Sprintf("%.2f", y))
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rect.CreateAttr("width", fmt.Sprintf("%.2f", width))
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rect.CreateAttr("height", fmt.Sprintf("%.2f", height))
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if fill != "" {
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rect.CreateAttr("fill", fill)
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}
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return rect
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}
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// CreateText creates a text element
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func CreateText(x, y float64, content string) *etree.Element {
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text := etree.NewElement("text")
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text.CreateAttr("x", fmt.Sprintf("%.2f", x))
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text.CreateAttr("y", fmt.Sprintf("%.2f", y))
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text.SetText(content)
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return text
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}
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// CreateGroup creates a group element
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func CreateGroup() *etree.Element {
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return etree.NewElement("g")
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}
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// SetFontAttributes sets font-related attributes on an element
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func SetFontAttributes(element *etree.Element, family string, size float64) {
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if family != "" {
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element.CreateAttr("font-family", family)
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}
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if size > 0 {
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element.CreateAttr("font-size", fmt.Sprintf("%.2fpx", size))
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}
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}
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// SetTextAttributes sets text-related attributes
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func SetTextAttributes(element *etree.Element, fill, textAnchor string) {
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if fill != "" {
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element.CreateAttr("fill", fill)
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}
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if textAnchor != "" {
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element.CreateAttr("text-anchor", textAnchor)
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}
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}
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// AddStyle adds a style attribute to an element
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func AddStyle(element *etree.Element, style string) {
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existing := element.SelectAttrValue("style", "")
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if existing != "" {
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style = existing + "; " + style
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}
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element.CreateAttr("style", style)
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}
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// Max returns the maximum of two float64 values
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func Max(a, b float64) float64 {
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if a > b {
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return a
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}
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return b
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}
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// Min returns the minimum of two float64 values
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func Min(a, b float64) float64 {
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if a < b {
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return a
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}
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return b
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}
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// Clamp constrains a value between min and max
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func Clamp(value, min, max float64) float64 {
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if value < min {
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return min
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}
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if value > max {
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return max
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}
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return value
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}
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