Add sprite duplication method

src/engine/blocks.js

@@ -2,6 +2,7 @@ const adapter = require('./adapter');
 const mutationAdapter = require('./mutation-adapter');
 const xmlEscape = require('../util/xml-escape');
 const MonitorRecord = require('./monitor-record');
+const Clone = require('../util/clone');
 
 /**
  * @fileoverview
@@ -178,6 +179,12 @@ class Blocks {
         return null;
     }
 
+    duplicate () {
+        const newBlocks = new Blocks();
+        newBlocks._blocks = Clone.simple(this._blocks);
+        newBlocks._scripts = Clone.simple(this._scripts);
+        return newBlocks;
+    }
     // ---------------------------------------------------------------------
 
     /**

src/import/load-costume.js

@@ -25,30 +25,30 @@ const loadCostume = function (md5ext, costume, runtime) {
     const ext = idParts[1].toLowerCase();
     const assetType = (ext === 'svg') ? AssetType.ImageVector : AssetType.ImageBitmap;
 
+    return runtime.storage.load(assetType, md5, ext).then(costumeAsset => {
+        costume.dataFormat = ext;
+        return loadCostumeFromAsset(costume, costumeAsset, runtime);
+    });
+};
+
+const loadCostumeFromAsset = function (costume, costumeAsset, runtime) {
     const rotationCenter = [
         costume.rotationCenterX / costume.bitmapResolution,
         costume.rotationCenterY / costume.bitmapResolution
     ];
 
-    let promise = runtime.storage.load(assetType, md5, ext).then(costumeAsset => {
-        costume.assetId = costumeAsset.assetId;
-        costume.dataFormat = ext;
-        return costumeAsset;
-    });
-
     if (!runtime.renderer) {
         log.error('No rendering module present; cannot load costume asset: ', md5ext);
-        return promise.then(() => costume);
+        return costume;
     }
-
-    if (assetType === AssetType.ImageVector) {
-        promise = promise.then(costumeAsset => {
+    const AssetType = runtime.storage.AssetType;
+    costume.assetId = costumeAsset.assetId;
+    if (costumeAsset.assetType === AssetType.ImageVector) {
         costume.skinId = runtime.renderer.createSVGSkin(costumeAsset.decodeText(), rotationCenter);
         return costume;
-        });
-    } else {
-        promise = promise.then(costumeAsset => (
-            new Promise((resolve, reject) => {
+    }
+
+    return new Promise((resolve, reject) => {
         const imageElement = new Image();
         const onError = function () {
                     // eslint-disable-next-line no-use-before-define
@@ -67,13 +67,12 @@ const loadCostume = function (md5ext, costume, runtime) {
         imageElement.addEventListener('error', onError);
         imageElement.addEventListener('load', onLoad);
         imageElement.src = costumeAsset.encodeDataURI();
-            })
-        )).then(imageElement => {
+    }).then(imageElement => {
         costume.skinId = runtime.renderer.createBitmapSkin(imageElement, costume.bitmapResolution, rotationCenter);
         return costume;
     });
-    }
-    return promise;
 };
 
+loadCostume.loadCostumeFromAsset = loadCostumeFromAsset;
+
 module.exports = loadCostume;

src/import/load-sound.js

@@ -23,18 +23,22 @@ const loadSound = function (sound, runtime) {
     const ext = idParts[1].toLowerCase();
     return runtime.storage.load(runtime.storage.AssetType.Sound, md5, ext)
         .then(soundAsset => {
-            sound.assetId = soundAsset.assetId;
             sound.dataFormat = ext;
+            return loadSoundFromAsset(sound, soundAsset, runtime);
+        });
+};
+
+const loadSoundFromAsset = function (sound, soundAsset, runtime) {
+    sound.assetId = soundAsset.assetId;
     return runtime.audioEngine.decodeSound(Object.assign(
         {},
         sound,
         {data: soundAsset.data}
-            ));
-        })
-        .then(soundId => {
+    )).then(soundId => {
         sound.soundId = soundId;
         return sound;
     });
 };
 
+loadSound.loadSoundFromAsset = loadSoundFromAsset;
 module.exports = loadSound;

src/sprites/rendered-target.js

@@ -787,6 +787,33 @@ class RenderedTarget extends Target {
         return newClone;
     }
 
+    /**
+     * Make a duplicate using a duplicate sprite.
+     * @return {RenderedTarget} New clone.
+     */
+    duplicate () {
+        return this.sprite.duplicate().then(newSprite => {
+            const newTarget = newSprite.createClone();
+            // Copy all properties.
+            // @todo refactor with clone methods
+            newTarget.x = Math.random() * 400 / 2;
+            newTarget.y = Math.random() * 300 / 2;
+            newTarget.direction = this.direction;
+            newTarget.draggable = this.draggable;
+            newTarget.visible = this.visible;
+            newTarget.size = this.size;
+            newTarget.currentCostume = this.currentCostume;
+            newTarget.rotationStyle = this.rotationStyle;
+            newTarget.effects = JSON.parse(JSON.stringify(this.effects));
+            newTarget.variables = JSON.parse(JSON.stringify(this.variables));
+            newTarget.lists = JSON.parse(JSON.stringify(this.lists));
+            newTarget.initDrawable();
+            newTarget.updateAllDrawableProperties();
+            newTarget.goBehindOther(this);
+            return newTarget;
+        });
+    }
+
     /**
      * Called when the project receives a "green flag."
      * For a rendered target, this clears graphic effects.

src/sprites/sprite.js

@@ -1,5 +1,8 @@
 const RenderedTarget = require('./rendered-target');
 const Blocks = require('../engine/blocks');
+const {loadSoundFromAsset} = require('../import/load-sound');
+const {loadCostumeFromAsset} = require('../import/load-costume');
+const StringUtil = require('../util/string-util');
 
 class Sprite {
     /**
@@ -73,6 +76,33 @@ class Sprite {
             this.clones.splice(cloneIndex, 1);
         }
     }
+
+    duplicate () {
+        const newSprite = new Sprite(null, this.runtime);
+
+        newSprite.blocks = this.blocks.duplicate();
+
+        const allNames = this.runtime.targets.map(t => t.name);
+        newSprite.name = StringUtil.unusedName(this.name, allNames);
+
+        const assetPromises = [];
+
+        newSprite.costumes = this.costumes.map(costume => {
+            const newCostume = Object.assign({}, costume);
+            const costumeAsset = this.runtime.storage.get(costume.assetId);
+            assetPromises.push(loadCostumeFromAsset(newCostume, costumeAsset, this.runtime));
+            return newCostume;
+        });
+
+        newSprite.sounds = this.sounds.map(sound => {
+            const newSound = Object.assign({}, sound);
+            const soundAsset = this.runtime.storage.get(sound.assetId);
+            assetPromises.push(loadSoundFromAsset(newSound, soundAsset, this.runtime));
+            return newSound;
+        });
+
+        return Promise.all(assetPromises).then(() => newSprite);
+    }
 }
 
 module.exports = Sprite;

src/virtual-machine.js

@@ -439,6 +439,31 @@ class VirtualMachine extends EventEmitter {
         }
     }
 
+    /**
+     * Duplicate a sprite.
+     * @param {string} targetId ID of a target whose sprite to duplicate.
+     */
+    duplicateSprite (targetId) {
+        const target = this.runtime.getTargetById(targetId);
+
+        if (target) {
+            if (!target.isSprite()) {
+                throw new Error('Cannot duplicate non-sprite targets.');
+            }
+            const sprite = target.sprite;
+            if (!sprite) {
+                throw new Error('No sprite associated with this target.');
+            }
+
+            target.duplicate().then(newTarget => {
+                this.runtime.targets.push(newTarget);
+                this.setEditingTarget(newTarget.id);
+            });
+        } else {
+            throw new Error('No target with the provided id.');
+        }
+    }
+
     /**
      * Set the audio engine for the VM/runtime
      * @param {!AudioEngine} audioEngine The audio engine to attach