feature #541: add crop transform tool

src/css/transformations.css

@@ -25,7 +25,7 @@
 .transformations-show-more-link {
   position: absolute;
   color: #999;
-  right: 8px;
+  right: 10px;
   font-weight: normal;
   cursor: pointer;
   transition: 0.2s linear;

src/js/controller/TransformationsController.js

@@ -8,6 +8,7 @@
       new pskl.tools.transform.Rotate(),
       new pskl.tools.transform.Clone(),
       new pskl.tools.transform.Center(),
+      new pskl.tools.transform.Crop(),
     ];
 
     this.toolIconBuilder = new pskl.tools.ToolIconBuilder();

src/js/controller/piskel/PiskelController.js

@@ -12,11 +12,15 @@
   /**
    * Set the current piskel. Will reset the selected frame and layer unless specified
    * @param {Object} piskel
-   * @param {Boolean} preserveState if true, keep the selected frame and layer
+   * @param {Object} options:
+   *                 preserveState {Boolean} if true, keep the selected frame and layer
+   *                 noSnapshot {Boolean} if true, do not save a snapshot in the piskel
+   *                            history for this call to setPiskel
    */
-  ns.PiskelController.prototype.setPiskel = function (piskel, preserveState) {
+  ns.PiskelController.prototype.setPiskel = function (piskel, options) {
     this.piskel = piskel;
-    if (!preserveState) {
+    options = options || {};
+    if (!options.preserveState) {
       this.currentLayerIndex = 0;
       this.currentFrameIndex = 0;
     }

src/js/controller/piskel/PublicPiskelController.js

@@ -49,14 +49,25 @@
     return this.piskelController;
   };
 
-  ns.PublicPiskelController.prototype.setPiskel = function (piskel, preserveState) {
-    this.piskelController.setPiskel(piskel, preserveState);
+  /**
+   * Set the current piskel. Will reset the selected frame and layer unless specified
+   * @param {Object} piskel
+   * @param {Object} options:
+   *                 preserveState {Boolean} if true, keep the selected frame and layer
+   *                 noSnapshot {Boolean} if true, do not save a snapshot in the piskel
+   *                            history for this call to setPiskel
+   */
+  ns.PublicPiskelController.prototype.setPiskel = function (piskel, options) {
+    this.piskelController.setPiskel(piskel, options);
 
     $.publish(Events.FRAME_SIZE_CHANGED);
     $.publish(Events.PISKEL_RESET);
-    $.publish(Events.PISKEL_SAVE_STATE, {
-      type : pskl.service.HistoryService.SNAPSHOT
-    });
+
+    if (!options || !options.noSnapshot) {
+      $.publish(Events.PISKEL_SAVE_STATE, {
+        type : pskl.service.HistoryService.SNAPSHOT
+      });
+    }
   };
 
   ns.PublicPiskelController.prototype.resetWrap_ = function (methodName) {

src/js/controller/settings/resize/ResizeController.js

@@ -69,7 +69,9 @@
       resizeContent: this.resizeContentCheckbox.checked
     });
 
-    pskl.app.piskelController.setPiskel(piskel, true);
+    pskl.app.piskelController.setPiskel(piskel, {
+      preserveState: true
+    });
 
     $.publish(Events.CLOSE_SETTINGS_DRAWER);
   };

src/js/tools/transform/Crop.js

@@ -0,0 +1,55 @@
+(function () {
+  var ns = $.namespace('pskl.tools.transform');
+
+  ns.Crop = function () {
+    this.toolId = 'tool-crop';
+    this.helpText = 'Crop the sprite';
+    this.tooltipDescriptors = [
+      {
+        description : 'Crop to fit the content or the selection. ' +
+                      'Applies to all frames and layers!'
+      }
+    ];
+  };
+
+  pskl.utils.inherit(ns.Crop, ns.AbstractTransformTool);
+
+  ns.Crop.prototype.applyToolOnFrame_ = function (frame, altKey) {
+    var currentPiskel = pskl.app.piskelController.getPiskel();
+    var frames = currentPiskel.getLayers().map(function (l) {
+      return l.getFrames();
+    }).reduce(function (p, n) {
+      return p.concat(n);
+    });
+
+    var boundaries = pskl.tools.transform.TransformUtils.getBoundaries(frames);
+    if (boundaries.minx >= boundaries.maxx) {
+      return;
+    }
+
+    var width = 1 + boundaries.maxx - boundaries.minx;
+    var height = 1 + boundaries.maxy - boundaries.miny;
+
+    if (width === currentPiskel.getWidth() && height === currentPiskel.getHeight()) {
+      // Do not perform an unnecessary resize if it's a noop.
+      return;
+    }
+
+    frames.forEach(function (frame) {
+      pskl.tools.transform.TransformUtils.moveFramePixels(frame, -boundaries.minx, -boundaries.miny);
+    });
+
+    var piskel = pskl.utils.ResizeUtils.resizePiskel(currentPiskel, {
+      width :  1 + boundaries.maxx - boundaries.minx,
+      height :  1 + boundaries.maxy - boundaries.miny,
+      origin: 'TOP-LEFT',
+      resizeContent: false
+    });
+
+    pskl.app.piskelController.setPiskel(piskel, {
+      preserveState: true,
+      noSnapshot: true
+    });
+  };
+
+})();

src/js/tools/transform/TransformUtils.js

@@ -64,32 +64,34 @@
       return frame;
     },
 
-    center : function(frame) {
-      // Figure out the boundary
-      var minx = frame.width;
-      var miny = frame.height;
+    getBoundaries : function(frames) {
+      var minx = frames[0].width;
+      var miny = frames[0].height;
       var maxx = 0;
       var maxy = 0;
+
       var transparentColorInt = pskl.utils.colorToInt(Constants.TRANSPARENT_COLOR);
-      frame.forEachPixel(function (color, x, y) {
-        if (color !== transparentColorInt) {
-          minx = Math.min(minx, x);
-          maxx = Math.max(maxx, x);
-          miny = Math.min(miny, y);
-          maxy = Math.max(maxy, y);
-        }
+
+      frames.forEach(function (frame) {
+        frame.forEachPixel(function (color, x, y) {
+          if (color !== transparentColorInt) {
+            minx = Math.min(minx, x);
+            maxx = Math.max(maxx, x);
+            miny = Math.min(miny, y);
+            maxy = Math.max(maxy, y);
+          }
+        });
       });
 
-      // Calculate how much to move the pixels
-      var bw = (maxx - minx + 1) / 2;
-      var bh = (maxy - miny + 1) / 2;
-      var fw = frame.width / 2;
-      var fh = frame.height / 2;
+      return {
+        minx: minx,
+        maxx: maxx,
+        miny: miny,
+        maxy: maxy,
+      };
+    },
 
-      var dx = Math.floor(fw - bw - minx);
-      var dy = Math.floor(fh - bh - miny);
-
-      // Actually move the pixels
+    moveFramePixels : function (frame, dx, dy) {
       var clone = frame.clone();
       frame.forEachPixel(function(color, x, y) {
         var _x = x;
@@ -104,7 +106,24 @@
           frame.setPixel(_x, _y, Constants.TRANSPARENT_COLOR);
         }
       });
+    },
 
+    center : function(frame) {
+      // Figure out the boundary
+      var boundaries = ns.TransformUtils.getBoundaries([frame]);
+
+      // Calculate how much to move the pixels
+      var bw = (boundaries.maxx - boundaries.minx + 1) / 2;
+      var bh = (boundaries.maxy - boundaries.miny + 1) / 2;
+      var fw = frame.width / 2;
+      var fh = frame.height / 2;
+
+      var dx = Math.floor(fw - bw - boundaries.minx);
+      var dy = Math.floor(fh - bh - boundaries.miny);
+
+      // Actually move the pixels
+
+      ns.TransformUtils.moveFramePixels(frame, dx, dy);
       return frame;
     }
   };

src/piskel-script-list.js

@@ -226,6 +226,7 @@
   "js/tools/transform/AbstractTransformTool.js",
   "js/tools/transform/Center.js",
   "js/tools/transform/Clone.js",
+  "js/tools/transform/Crop.js",
   "js/tools/transform/Flip.js",
   "js/tools/transform/Rotate.js",
   "js/tools/transform/TransformUtils.js",