September 2017 Update

Task/Bitmap-Midpoint-circle-algorithm/Kotlin/bitmap-midpoint-circle-algorithm.kotlin

@@ -0,0 +1,60 @@
+// version 1.1.4-3
+
+import java.awt.Color
+import java.awt.Graphics
+import java.awt.image.BufferedImage
+import javax.swing.JOptionPane
+import javax.swing.JLabel
+import javax.swing.ImageIcon
+
+class BasicBitmapStorage(width: Int, height: Int) {
+    val image = BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR)
+
+    fun fill(c: Color) {
+        val g = image.graphics
+        g.color = c
+        g.fillRect(0, 0, image.width, image.height)
+    }
+
+    fun setPixel(x: Int, y: Int, c: Color) = image.setRGB(x, y, c.getRGB())
+
+    fun getPixel(x: Int, y: Int) = Color(image.getRGB(x, y))
+}
+
+fun drawCircle(bbs: BasicBitmapStorage, centerX: Int, centerY: Int, radius: Int, circleColor: Color) {
+    var d = (5 - radius * 4) / 4
+    var x = 0
+    var y = radius
+
+    do {
+        with(bbs) {
+            setPixel(centerX + x, centerY + y, circleColor)
+            setPixel(centerX + x, centerY - y, circleColor)
+            setPixel(centerX - x, centerY + y, circleColor)
+            setPixel(centerX - x, centerY - y, circleColor)
+            setPixel(centerX + y, centerY + x, circleColor)
+            setPixel(centerX + y, centerY - x, circleColor)
+            setPixel(centerX - y, centerY + x, circleColor)
+            setPixel(centerX - y, centerY - x, circleColor)
+        }
+        if (d < 0) {
+            d += 2 * x + 1
+        }
+        else {
+            d += 2 * (x - y) + 1
+            y--
+        }
+        x++
+    }
+    while (x <= y)
+}
+
+fun main(args: Array<String>) {
+    val bbs = BasicBitmapStorage(400, 400)
+    bbs.fill(Color.pink)
+    drawCircle(bbs, 200, 200, 100, Color.black)
+    drawCircle(bbs, 200, 200,  50, Color.white)
+    val label = JLabel(ImageIcon(bbs.image))
+    val title = "Bresenham's circle algorithm"
+    JOptionPane.showMessageDialog(null, label, title, JOptionPane.PLAIN_MESSAGE)
+}