diff --git a/src/core/Graph.kt b/src/core/Graph.kt
index 121f77d..7e99428 100644
--- a/src/core/Graph.kt
+++ b/src/core/Graph.kt
@@ -1,9 +1,13 @@
 package core
 
+import core.models.Line
+import core.models.Point
 import core.processors.BinaryProcessor
+import utils.exceptions.LineNotFoundException
 import java.awt.Color
 import java.awt.image.BufferedImage
 import java.io.File
+import java.util.*
 import javax.imageio.ImageIO
 
 /**
@@ -13,33 +17,69 @@ import javax.imageio.ImageIO
 class Graph(file: File) {
 	val image: BufferedImage
 	val cache: BufferedImage
+	val mark: Array<Array<Boolean>>
 
 	init {
 		image = ImageIO.read(file)
 		cache = ImageIO.read(file)
+		mark = Array(cache.height, {
+			Array(cache.width, { false })
+		})
 		init()
 	}
 
 	fun init() {
 		(0..image.width - 1).forEach { x ->
 			(0..image.height - 1).forEach { y ->
-				image.setRGB(
-						x, y,
-						getBin(x, y)
-				)
+				image.setRGB(x, y, color(x, y))
+				mark[x][y] = this[x, y]
 			}
 		}
 	}
 
+	/**
+	 * please handle an exception
+	 */
+	fun findLine(x: Int, y: Int) {
+		var line = ArrayList<Line>()
+		if (!mark[x][y]) throw LineNotFoundException(x, y)
+//		deprecated
+//		var max = Max(x, y, -1.0)
+//		(-1..1).forEach { x ->
+//			(-1..1).forEach { y ->
+//				if (x == 0 && y == 0) return
+//				var p = Point(x, y)
+//
+//			}
+//		}
+	}
+
+	fun findLine(point: Point) = findLine(point.x, point.y)
+
 	/**
 	 * @param x x in image
 	 * @param y y in image
 	 * @return black or white
 	 */
-	private fun getBin(x: Int, y: Int) =
-			if (BinaryProcessor.getGray(cache.getRGB(x, y)) > average)
+	private fun color(x: Int, y: Int) =
+			if (get(x, y))
 				Color.WHITE.rgb
 			else
 				Color.BLACK.rgb
 
+	private fun color(point: Point) =
+			color(point.x, point.y)
+
+	operator fun get(x: Int, y: Int) =
+			BinaryProcessor.getGray(cache.getRGB(x, y)) > average
+
+	operator fun get(point: Point) = this[point.x, point.y]
+
+	private fun isLine(x: Point, y: Point): Boolean {
+		// tOdO
+		return true
+	}
+
+	data class Max(val x: Int, val y: Int, val length: Double)
+
 }
\ No newline at end of file
diff --git a/src/core/models/Line.kt b/src/core/models/Line.kt
index 21f75eb..3a37393 100644
--- a/src/core/models/Line.kt
+++ b/src/core/models/Line.kt
@@ -8,17 +8,14 @@ import core.deviation
  */
 class Line(val a: Double, val b: Double, val c: Double) {
 
-	/**
-	 * is the point located on (x, y) belong to this line
-	 */
-	operator fun get(x: Double, y: Double) = on(x, y)
+	/** is the point located on (x, y) belong to this line */
+	operator fun get(x: Int, y: Int) = on(x, y)
 
-	operator fun get(point: Point) =
-			get(point.x, point.y)
+	operator fun get(point: Point) = get(point.x, point.y)
 
-	fun on(x: Double, y: Double) =
-			Math.abs(bring(x, y)) < deviation
+	/** 判断一个点在不在方程上 */
+	fun on(x: Int, y: Int) = Math.abs(bring(x, y)) < deviation
 
-	fun bring(x: Double, y: Double) =
-			a * x + b * y + c
+	/** 将一个点带入直线方程 */
+	fun bring(x: Int, y: Int) = a * x + b * y + c
 }
\ No newline at end of file
diff --git a/src/core/models/Point.kt b/src/core/models/Point.kt
index e80b070..4cc5545 100644
--- a/src/core/models/Point.kt
+++ b/src/core/models/Point.kt
@@ -4,17 +4,18 @@ package core.models
  * @author ice1000
  * Created by ice1000 on 2016/8/8.
  */
-class Point(val x: Double, val y: Double) {
+class Point(val x: Int, val y: Int) {
 
 	var quadrant = 0
 
-	/**
-	 * 计算象限
-	 */
+	/** 计算象限 */
 	init {
 		quadrant += if (x >= 0) 1 else 2
 		quadrant += if (y >= 0) 0 else 3
 		if (quadrant == 5) quadrant = 3
 	}
 
+	override fun toString(): String =
+			x.toString() + y.toString()
+
 }
diff --git a/src/utils/exceptions/LineNotFoundException.kt b/src/utils/exceptions/LineNotFoundException.kt
new file mode 100644
index 0000000..62841c5
--- /dev/null
+++ b/src/utils/exceptions/LineNotFoundException.kt
@@ -0,0 +1,14 @@
+package utils.exceptions
+
+import core.models.Point
+
+/**
+ * @author ice1000
+ * Created by ice1000 on 2016/8/8.
+ */
+class LineNotFoundException(val point: Point) :
+		Exception("no line found at point" + point.toString()) {
+
+	constructor(x: Int, y: Int) : this(Point(x, y))
+
+}
\ No newline at end of file
diff --git a/src/utils/package-info.java b/src/utils/package-info.java
new file mode 100644
index 0000000..fd33596
--- /dev/null
+++ b/src/utils/package-info.java
@@ -0,0 +1,7 @@
+/**
+ * @author ice1000
+ * Created by ice1000 on 2016/8/8.
+ *
+ * sth which I have no idea where 2 put them.
+ */
+package utils;
\ No newline at end of file
diff --git a/test/core/models/Point.kt b/test/core/models/Point.kt
index 2cb46b3..99b314f 100644
--- a/test/core/models/Point.kt
+++ b/test/core/models/Point.kt
@@ -6,8 +6,8 @@ package core.models
  */
 
 fun main(args: Array<String>) {
-	println(Point(1.0, 1.0).quadrant)
-	println(Point(-1.0, 1.0).quadrant)
-	println(Point(-1.0, -1.0).quadrant)
-	println(Point(1.0, -1.0).quadrant)
+	println(Point(1, 1).quadrant)
+	println(Point(-1, 1).quadrant)
+	println(Point(-1, -1).quadrant)
+	println(Point(1, -1).quadrant)
 }
\ No newline at end of file