#19 create initial helper for rendering diagrams using java2d

acropolis-report/src/main/kotlin/org/ephyra/acropolis/report/impl/render/DiagramRenderer.kt

@@ -0,0 +1,37 @@
+package org.ephyra.acropolis.report.impl.render
+
+import java.awt.Color
+import java.awt.Graphics2D
+import java.awt.image.BufferedImage
+import java.awt.image.BufferedImage.TYPE_INT_RGB
+import java.io.File
+import javax.imageio.ImageIO
+
+class DiagramRenderer(
+        private val width: Int,
+
+        private val height: Int
+) : AutoCloseable {
+    private val targetImg: BufferedImage = BufferedImage(width, height, TYPE_INT_RGB)
+    private val target: Graphics2D
+
+    init {
+        target = targetImg.createGraphics()
+
+        target.color = Color.WHITE
+        target.fillRect(0, 0, width, height)
+    }
+
+    fun addImage(positionX: Int, positionY: Int, source: File) {
+        val img = ImageIO.read(source)
+        target.drawImage(img, positionX, positionY, img.width, img.height, null)
+    }
+
+    fun export(outFile: File) {
+        ImageIO.write(targetImg, outFile.extension, outFile)
+    }
+
+    override fun close() {
+        target.dispose()
+    }
+}