Better CAPTCHA image generation algorithm.
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21e5ec118e
commit
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@ -1,10 +1,9 @@
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package captcha
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import (
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"crypto/rand"
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"image"
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"justcaptcha/pkg/captcha"
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"math/big"
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"math/rand"
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"time"
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"github.com/fogleman/gg"
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@ -47,30 +46,28 @@ func (c *DwellingCaptcha) generateImage(style string) *image.Image {
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ctx.DrawStringAnchored(string(c.GetAnswer()), 20, 5, .5, .5)
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// draw lines and points
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h := float64(ctx.Height())
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ctx.SetRGB255(0x9f, 0x2b, 0x68)
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for i := 0; i < 16; i++ {
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x0, _ := rand.Int(rand.Reader, big.NewInt(int64(ctx.Height())))
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x1, _ := rand.Int(rand.Reader, big.NewInt(int64(ctx.Height())))
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r, _ := rand.Int(rand.Reader, big.NewInt(int64(4)))
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ctx.SetLineWidth(2)
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ctx.DrawPoint(float64(x0.Int64()), float64(x1.Int64()), float64(r.Int64()))
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ctx.DrawLine(float64(x0.Int64()), 0, float64(ctx.Height()), float64(x1.Int64()))
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ctx.Stroke()
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}
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for i := 0; i < 16; i++ {
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x0, _ := rand.Int(rand.Reader, big.NewInt(int64(ctx.Height())))
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x1, _ := rand.Int(rand.Reader, big.NewInt(int64(ctx.Height())))
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r, _ := rand.Int(rand.Reader, big.NewInt(int64(4)))
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ctx.SetLineWidth(2)
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ctx.DrawPoint(float64(x0.Int64()), float64(x1.Int64()), float64(r.Int64()))
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ctx.DrawLine(0, float64(x0.Int64()), float64(x1.Int64()), float64(ctx.Height()))
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for i := 0; i < 24; i++ {
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x0 := rand.Float64() * h
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x1 := rand.Float64() * h
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x2 := rand.Float64() * h
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x3 := rand.Float64() * h
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ctx.DrawLine(x0, 0, h, x1)
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ctx.DrawLine(0, x2, x3, h)
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r := rand.Intn(256)
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g := rand.Intn(256)
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b := rand.Intn(256)
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ctx.SetRGB255(r, g, b)
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lw := float64(rand.Float32() * 4.0)
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if lw == 0 {
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lw = 0.1
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}
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ctx.SetLineWidth(lw)
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ctx.Stroke()
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}
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c.Image = ctx.Image()
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return &c.Image
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}
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