Feature/#66 pan while zoom

library/build.gradle

@@ -33,6 +33,9 @@ android {
 dependencies {
     api "androidx.annotation:annotation:$supportLibVersion"
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+
+    testImplementation "org.junit.jupiter:junit-jupiter-api:5.3.1"
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.3.1"
 }
 
 

library/src/main/java/com/otaliastudios/zoom/AbsolutePoint.kt

@@ -0,0 +1,49 @@
+package com.otaliastudios.zoom
+
+/**
+ * This class represents an absolute point on the ZoomEngine canvas (or beyond it's bounds)
+ */
+data class AbsolutePoint(
+        @ZoomApi.AbsolutePan var x: Float,
+        @ZoomApi.AbsolutePan var y: Float) {
+
+    /**
+     * Set new coordinates
+     *
+     * @param x x-axis value
+     * @param y y-axis value
+     */
+    @JvmOverloads
+    fun set(@ZoomApi.AbsolutePan x: Float = this.x, @ZoomApi.AbsolutePan y: Float = this.y) {
+        this.x = x
+        this.y = y
+    }
+
+    /**
+     * Set new coordinates
+     *
+     * @param p the [AbsolutePoint] to copy values from
+     */
+    fun set(p: AbsolutePoint) {
+        set(p.x, p.y)
+    }
+
+    /**
+     * Substract a point from another point
+     *
+     * @param absolutePoint the point to substract
+     */
+    operator fun minus(absolutePoint: AbsolutePoint): AbsolutePoint {
+        return AbsolutePoint(this.x - absolutePoint.x, this.y - absolutePoint.y)
+    }
+
+    /**
+     * Add a point to another point
+     *
+     * @param absolutePoint the point to add
+     */
+    operator fun plus(absolutePoint: AbsolutePoint): AbsolutePoint {
+        return AbsolutePoint(this.x + absolutePoint.x, this.y + absolutePoint.y)
+    }
+
+}

library/src/main/java/com/otaliastudios/zoom/ScaledPoint.kt

@@ -0,0 +1,62 @@
+package com.otaliastudios.zoom
+
+/**
+ * This class represents a scaled point on the ZoomEngine canvas (or beyond it's bounds)
+ *
+ * Note that these values depend on the current zoomlevel
+ */
+data class ScaledPoint(
+        @ZoomApi.ScaledPan var x: Float,
+        @ZoomApi.ScaledPan var y: Float) {
+
+    /**
+     * Add the given values to this point
+     *
+     * @param x x-axis offset
+     * @param y y-axis offset
+     */
+    fun offset(@ZoomApi.ScaledPan offsetX: Float = 0F, @ZoomApi.ScaledPan offsetY: Float = 0F) {
+        this.x += offsetX
+        this.y += offsetY
+    }
+
+    /**
+     * Set new coordinates
+     *
+     * @param x x-axis value
+     * @param y y-axis value
+     */
+    @JvmOverloads
+    fun set(@ZoomApi.ScaledPan x: Float = this.x, @ZoomApi.ScaledPan y: Float = this.y) {
+        this.x = x
+        this.y = y
+    }
+
+    /**
+     * Set new coordinates
+     *
+     * @param p the [ScaledPoint] to copy values from
+     */
+    fun set(p: ScaledPoint) {
+        set(p.x, p.y)
+    }
+
+    /**
+     * Substract a point from another point
+     *
+     * @param scaledPoint the point to substract
+     */
+    operator fun minus(scaledPoint: ScaledPoint): ScaledPoint {
+        return ScaledPoint(this.x - scaledPoint.x, this.y - scaledPoint.y)
+    }
+
+    /**
+     * Add a point to another point
+     *
+     * @param scaledPoint the point to add
+     */
+    operator fun plus(scaledPoint: ScaledPoint): ScaledPoint {
+        return ScaledPoint(this.x + scaledPoint.x, this.y + scaledPoint.y)
+    }
+
+}