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refining the Rain drop captcha

This commit is contained in:
hrj 2019-04-01 00:30:45 +05:30
parent beb184d7a9
commit a207b9dee6
1 changed files with 32 additions and 9 deletions
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41
src/main/scala/lc/RainDropsCaptcha.scala
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@ -3,6 +3,7 @@ package lc
import java.awt.image.BufferedImage
import java.awt.RenderingHints
import java.awt.Font
import java.awt.font.TextAttribute
import java.awt.Color
import java.io.ByteArrayOutputStream
import javax.imageio.ImageIO
@ -23,19 +24,32 @@ class Drop {
class RainDropsCP extends ChallengeProvider {
private val alphabet = "abcdefghijklmnopqrstuvwxyz"
private val n = 6
private val bgColor = new Color(245, 245, 245)
private val textColor = new Color(248, 248, 248)
private val textHighlightColor = new Color(208, 208, 255)
def getId = "FilterChallenge"
private def extendDrops(drops: Array[Drop], steps: Int, xOffset: Int) = {
drops.map(d => {
val nd = new Drop()
nd.x + xOffset*steps
nd.y + d.yOffset*steps
nd
})
}
def returnChallenge(): Challenge = {
val r = new scala.util.Random
val secret = Stream.continually(r.nextInt(alphabet.size)).map(alphabet).take(n).mkString
// val secret = "mmmmmm"
val width = 450
val height = 100
val imgType = BufferedImage.TYPE_INT_RGB
val xOffset = 1+r.nextInt(2)
val xBias = (height / 10) - 2
val drops = Array.fill[Drop](1500)( new Drop())
for (d <- drops) {
val dropsOrig = Array.fill[Drop](600)( new Drop())
for (d <- dropsOrig) {
d.x = r.nextInt(width) - (xBias/2)*xOffset
d.yOffset = 6+r.nextInt(6)
d.y = r.nextInt(height)
@ -44,10 +58,17 @@ class RainDropsCP extends ChallengeProvider {
d.colorChange *= -1
}
}
val drops = dropsOrig ++ extendDrops(dropsOrig, 2, xOffset) ++ extendDrops(dropsOrig, 4, xOffset)
val baseFont = new Font(Font.MONOSPACED, Font.BOLD, 80)
val attributes = new java.util.HashMap[TextAttribute, Object]()
attributes.put(TextAttribute.TRACKING, Double.box(0.2))
attributes.put(TextAttribute.WEIGHT, TextAttribute.WEIGHT_EXTRABOLD)
val spacedFont = baseFont.deriveFont(attributes)
val baos = new ByteArrayOutputStream();
val ios = new MemoryCacheImageOutputStream(baos);
val writer = new GifSequenceWriter(ios, imgType, 100, true);
val writer = new GifSequenceWriter(ios, imgType, 60, true);
for(i <- 0 until 30){
val yOffset = 5+r.nextInt(5)
val canvas = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB)
@ -55,7 +76,7 @@ class RainDropsCP extends ChallengeProvider {
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON)
// clear the canvas
g.setColor(Color.WHITE)
g.setColor(bgColor)
g.fillRect(0, 0, canvas.getWidth, canvas.getHeight)
// paint the rain
@ -66,8 +87,10 @@ class RainDropsCP extends ChallengeProvider {
d.y += d.yOffset
d.color += d.colorChange
if (d.x > width+xOffset || d.y > height+d.yOffset) {
d.x = r.nextInt(width) - xBias*xOffset
d.y = 0
val ySteps = 1 + height / d.yOffset
d.x -= xOffset*ySteps
d.y -= yOffset*ySteps
}
if (d.color > 200 || d.color < 21) {
d.colorChange *= -1
@ -75,15 +98,15 @@ class RainDropsCP extends ChallengeProvider {
}
// center the text
g.setFont(new Font("Sans", Font.BOLD, 70))
g.setFont(spacedFont)
val textWidth = g.getFontMetrics().charsWidth(secret.toCharArray, 0, secret.toCharArray.length)
val textX = (width - textWidth)/2
// paint the top outline
g.setColor(Color.BLUE)
g.setColor(textHighlightColor)
g.drawString(secret, textX, 69)
// paint the text
g.setColor(Color.WHITE)
g.setColor(textColor)
g.drawString(secret, textX, 70)
g.dispose()