59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
package clockface
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import (
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"fmt"
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"io"
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"time"
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)
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const (
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hourHandLength = 50
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secondHandLength = 90
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minuteHandLength = 80
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clockCentreX = 150
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clockCentreY = 150
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)
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const svgStart = `<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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<svg xmlns="http://www.w3.org/2000/svg"
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width="100%"
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height="100%"
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viewBox="0 0 300 300"
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version="2.0">`
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const bezel = `<circle cx="150" cy="150" r="100" style="fill:#fff;stroke:#000;stroke-width:5px;"/>`
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const svgEnd = `</svg>`
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//SVGWriter writes an SVG representation of an analog clock, showing the time t, to the writer w
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func SVGWriter(w io.Writer, t time.Time) {
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io.WriteString(w, svgStart)
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io.WriteString(w, bezel)
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SecondHand(w, t)
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MinuteHand(w, t)
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HourHand(w, t)
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io.WriteString(w, svgEnd)
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}
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func makeHand(p Point, length float64) Point {
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p = Point{p.X * length, p.Y * length}
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p = Point{p.X, -p.Y}
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return Point{p.X + clockCentreX, p.Y + clockCentreY}
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}
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func SecondHand(w io.Writer, t time.Time) {
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p := makeHand(secondHandPoint(t), secondHandLength)
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fmt.Fprintf(w, `<line x1="150" y1="150" x2="%.3f" y2="%.3f" style="fill:none;stroke:#f00;stroke-width:3px;"/>`, p.X, p.Y)
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}
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func MinuteHand(w io.Writer, t time.Time) {
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p := makeHand(minuteHandPoint(t), minuteHandLength)
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fmt.Fprintf(w, `<line x1="150" y1="150" x2="%.3f" y2="%.3f" style="fill:none;stroke:#000;stroke-width:3px;"/>`, p.X, p.Y)
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}
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func HourHand(w io.Writer, t time.Time) {
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p := makeHand(hourHandPoint(t), hourHandLength)
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fmt.Fprintf(w, `<line x1="150" y1="150" x2="%.3f" y2="%.3f" style="fill:none;stroke:#000;stroke-width:3px;"/>`, p.X, p.Y)
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}
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