Data commit

Task/Draw-a-clock/Kotlin/draw-a-clock.kotlin

@@ -0,0 +1,71 @@
+// version 1.1
+
+import java.awt.*
+import java.time.LocalTime
+import javax.swing.*
+
+class Clock : JPanel() {
+    private val degrees06: Float = (Math.PI / 30.0).toFloat()
+    private val degrees30: Float = degrees06 * 5.0f
+    private val degrees90: Float =  degrees30 * 3.0f
+    private val size = 590
+    private val spacing = 40
+    private val diameter = size - 2 * spacing
+    private val cx = diameter / 2 + spacing
+    private val cy = cx
+
+    init {
+        preferredSize = Dimension(size, size)
+        background =  Color.white
+        Timer(1000) {
+            repaint()
+        }.start()
+    }
+
+    override public fun paintComponent(gg: Graphics) {
+        super.paintComponent(gg)
+        val g = gg as Graphics2D
+        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON)
+        drawFace(g)
+        val time  = LocalTime.now()
+        val hour = time.hour
+        val minute = time.minute
+        val second = time.second
+        var angle: Float = degrees90 - degrees06 * second
+        drawHand(g, angle, diameter / 2 - 30, Color.red)
+        val minsecs: Float = minute + second / 60.0f
+        angle = degrees90 - degrees06 * minsecs
+        drawHand(g, angle, diameter / 3 + 10, Color.black)
+        val hourmins: Float = hour + minsecs / 60.0f
+        angle = degrees90 - degrees30 * hourmins
+        drawHand(g, angle, diameter / 4 + 10, Color.black)
+    }
+
+    private fun drawFace(g: Graphics2D) {
+        g.stroke = BasicStroke(2.0f)
+        g.color = Color.yellow
+        g.fillOval(spacing, spacing, diameter, diameter)
+        g.color = Color.black
+        g.drawOval(spacing, spacing, diameter, diameter)
+    }
+
+    private fun drawHand(g: Graphics2D, angle: Float, radius: Int, color: Color) {
+        val x: Int  = cx + (radius.toDouble() * Math.cos(angle.toDouble())).toInt()
+        val y: Int =  cy - (radius.toDouble() * Math.sin(angle.toDouble())).toInt()
+        g.color = color
+        g.drawLine(cx, cy, x, y)
+    }
+}
+
+fun main(args: Array<String>) {
+    SwingUtilities.invokeLater {
+        val f = JFrame()
+        f.defaultCloseOperation = JFrame.EXIT_ON_CLOSE
+        f.title = "Clock"
+        f.isResizable = false
+        f.add(Clock(), BorderLayout.CENTER)
+        f.pack()
+        f.setLocationRelativeTo(null)
+        f.isVisible = true
+    }
+}