Bitmap rectangle tool (#494)

src/components/bit-rect-mode/bit-rect-mode.jsx

@@ -1,27 +1,26 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 
-import {ComingSoonTooltip} from '../coming-soon/coming-soon.jsx';
 import ToolSelectComponent from '../tool-select-base/tool-select-base.jsx';
 
 import rectIcon from './rectangle.svg';
 
-const BitRectComponent = () => (
-    <ComingSoonTooltip
-        place="right"
-        tooltipId="bit-rect-mode"
-    >
-        <ToolSelectComponent
-            disabled
-            imgDescriptor={{
-                defaultMessage: 'Rectangle',
-                description: 'Label for the rectangle tool',
-                id: 'paint.rectMode.rect'
-            }}
-            imgSrc={rectIcon}
-            isSelected={false}
-            onMouseDown={function () {}} // eslint-disable-line react/jsx-no-bind
-        />
-    </ComingSoonTooltip>
+const BitRectComponent = props => (
+    <ToolSelectComponent
+        imgDescriptor={{
+            defaultMessage: 'Rectangle',
+            description: 'Label for the rectangle tool',
+            id: 'paint.rectMode.rect'
+        }}
+        imgSrc={rectIcon}
+        isSelected={props.isSelected}
+        onMouseDown={props.onMouseDown}
+    />
 );
 
+BitRectComponent.propTypes = {
+    isSelected: PropTypes.bool.isRequired,
+    onMouseDown: PropTypes.func.isRequired
+};
+
 export default BitRectComponent;

src/components/paint-editor/paint-editor.jsx

@@ -9,7 +9,7 @@ import PaperCanvas from '../../containers/paper-canvas.jsx';
 import BitBrushMode from '../../containers/bit-brush-mode.jsx';
 import BitLineMode from '../../containers/bit-line-mode.jsx';
 import BitOvalMode from '../../components/bit-oval-mode/bit-oval-mode.jsx';
-import BitRectMode from '../../components/bit-rect-mode/bit-rect-mode.jsx';
+import BitRectMode from '../../containers/bit-rect-mode.jsx';
 import BitTextMode from '../../components/bit-text-mode/bit-text-mode.jsx';
 import BitFillMode from '../../components/bit-fill-mode/bit-fill-mode.jsx';
 import BitEraserMode from '../../components/bit-eraser-mode/bit-eraser-mode.jsx';
@@ -177,7 +177,9 @@ const PaintEditorComponent = props => (
                         onUpdateImage={props.onUpdateImage}
                     />
                     <BitOvalMode />
-                    <BitRectMode />
+                    <BitRectMode
+                        onUpdateImage={props.onUpdateImage}
+                    />
                     <BitTextMode />
                     <BitFillMode />
                     <BitEraserMode />

src/containers/bit-rect-mode.jsx

@@ -0,0 +1,109 @@
+import paper from '@scratch/paper';
+import PropTypes from 'prop-types';
+import React from 'react';
+import {connect} from 'react-redux';
+import bindAll from 'lodash.bindall';
+import Modes from '../lib/modes';
+import {MIXED} from '../helper/style-path';
+
+import {changeFillColor, DEFAULT_COLOR} from '../reducers/fill-color';
+import {changeMode} from '../reducers/modes';
+import {clearSelectedItems, setSelectedItems} from '../reducers/selected-items';
+import {clearSelection, getSelectedLeafItems} from '../helper/selection';
+import RectTool from '../helper/bit-tools/rect-tool';
+import RectModeComponent from '../components/bit-rect-mode/bit-rect-mode.jsx';
+
+class BitRectMode extends React.Component {
+    constructor (props) {
+        super(props);
+        bindAll(this, [
+            'activateTool',
+            'deactivateTool'
+        ]);
+    }
+    componentDidMount () {
+        if (this.props.isRectModeActive) {
+            this.activateTool(this.props);
+        }
+    }
+    componentWillReceiveProps (nextProps) {
+        if (this.tool && nextProps.color !== this.props.color) {
+            this.tool.setColor(nextProps.color);
+        }
+        if (this.tool && nextProps.selectedItems !== this.props.selectedItems) {
+            this.tool.onSelectionChanged(nextProps.selectedItems);
+        }
+
+        if (nextProps.isRectModeActive && !this.props.isRectModeActive) {
+            this.activateTool();
+        } else if (!nextProps.isRectModeActive && this.props.isRectModeActive) {
+            this.deactivateTool();
+        }
+    }
+    shouldComponentUpdate (nextProps) {
+        return nextProps.isRectModeActive !== this.props.isRectModeActive;
+    }
+    activateTool () {
+        clearSelection(this.props.clearSelectedItems);
+        // Force the default brush color if fill is MIXED or transparent
+        const fillColorPresent = this.props.color !== MIXED && this.props.color !== null;
+        if (!fillColorPresent) {
+            this.props.onChangeFillColor(DEFAULT_COLOR);
+        }
+        this.tool = new RectTool(
+            this.props.setSelectedItems,
+            this.props.clearSelectedItems,
+            this.props.onUpdateImage);
+        this.tool.setColor(this.props.color);
+        this.tool.activate();
+    }
+    deactivateTool () {
+        this.tool.deactivateTool();
+        this.tool.remove();
+        this.tool = null;
+    }
+    render () {
+        return (
+            <RectModeComponent
+                isSelected={this.props.isRectModeActive}
+                onMouseDown={this.props.handleMouseDown}
+            />
+        );
+    }
+}
+
+BitRectMode.propTypes = {
+    clearSelectedItems: PropTypes.func.isRequired,
+    color: PropTypes.string,
+    handleMouseDown: PropTypes.func.isRequired,
+    isRectModeActive: PropTypes.bool.isRequired,
+    onChangeFillColor: PropTypes.func.isRequired,
+    onUpdateImage: PropTypes.func.isRequired,
+    selectedItems: PropTypes.arrayOf(PropTypes.instanceOf(paper.Item)),
+    setSelectedItems: PropTypes.func.isRequired
+};
+
+const mapStateToProps = state => ({
+    color: state.scratchPaint.color.fillColor,
+    isRectModeActive: state.scratchPaint.mode === Modes.BIT_RECT,
+    selectedItems: state.scratchPaint.selectedItems
+});
+const mapDispatchToProps = dispatch => ({
+    clearSelectedItems: () => {
+        dispatch(clearSelectedItems());
+    },
+    setSelectedItems: () => {
+        dispatch(setSelectedItems(getSelectedLeafItems()));
+    },
+    handleMouseDown: () => {
+        dispatch(changeMode(Modes.BIT_RECT));
+    },
+    onChangeFillColor: fillColor => {
+        dispatch(changeFillColor(fillColor));
+    }
+});
+
+export default connect(
+    mapStateToProps,
+    mapDispatchToProps
+)(BitRectMode);

src/containers/paint-editor.jsx

@@ -2,6 +2,7 @@ import paper from '@scratch/paper';
 import PropTypes from 'prop-types';
 
 import React from 'react';
+import {connect} from 'react-redux';
 import PaintEditorComponent from '../components/paint-editor/paint-editor.jsx';
 
 import {changeMode} from '../reducers/modes';
@@ -13,7 +14,7 @@ import {setTextEditTarget} from '../reducers/text-edit-target';
 import {updateViewBounds} from '../reducers/view-bounds';
 
 import {getRaster, hideGuideLayers, showGuideLayers} from '../helper/layer';
-import {getHitBounds} from '../helper/bitmap';
+import {convertToBitmap, convertToVector, getHitBounds} from '../helper/bitmap';
 import {performUndo, performRedo, performSnapshot, shouldShowUndo, shouldShowRedo} from '../helper/undo';
 import {bringToFront, sendBackward, sendToBack, bringForward} from '../helper/order';
 import {groupSelection, ungroupSelection} from '../helper/group';
@@ -24,9 +25,9 @@ import {resetZoom, zoomOnSelection} from '../helper/view';
 import EyeDropperTool from '../helper/tools/eye-dropper';
 
 import Modes from '../lib/modes';
+import {BitmapModes} from '../lib/modes';
 import Formats from '../lib/format';
 import {isBitmap, isVector} from '../lib/format';
-import {connect} from 'react-redux';
 import bindAll from 'lodash.bindall';
 
 class PaintEditor extends React.Component {
@@ -61,6 +62,9 @@ class PaintEditor extends React.Component {
             canvas: null,
             colorInfo: null
         };
+        // When isSwitchingFormats is true, the format is about to switch, but isn't done switching.
+        // This gives currently active tools a chance to finish what they were doing.
+        this.isSwitchingFormats = false;
     }
     componentDidMount () {
         document.addEventListener('keydown', (/* event */) => {
@@ -76,6 +80,17 @@ class PaintEditor extends React.Component {
         document.addEventListener('mousedown', this.onMouseDown);
         document.addEventListener('touchstart', this.onMouseDown);
     }
+    componentWillReceiveProps (newProps) {
+        if ((isVector(this.props.format) && newProps.format === Formats.BITMAP) ||
+                (isBitmap(this.props.format) && newProps.format === Formats.VECTOR)) {
+            this.isSwitchingFormats = true;
+        }
+        if (isVector(this.props.format) && isBitmap(newProps.format)) {
+            this.switchMode(Formats.BITMAP);
+        } else if (isVector(newProps.format) && isBitmap(this.props.format)) {
+            this.switchMode(Formats.VECTOR);
+        }
+    }
     componentDidUpdate (prevProps) {
         if (this.props.isEyeDropping && !prevProps.isEyeDropping) {
             this.startEyeDroppingLoop();
@@ -83,9 +98,12 @@ class PaintEditor extends React.Component {
             this.stopEyeDroppingLoop();
         }
 
-        if ((isVector(this.props.format) && isBitmap(prevProps.format)) ||
-            (isVector(prevProps.format) && isBitmap(this.props.format))) {
-            this.switchMode(this.props.format);
+        if (this.props.format === Formats.VECTOR && isBitmap(prevProps.format)) {
+            this.isSwitchingFormats = false;
+            convertToVector(this.props.clearSelectedItems, this.handleUpdateImage);
+        } else if (isVector(prevProps.format) && this.props.format === Formats.BITMAP) {
+            this.isSwitchingFormats = false;
+            convertToBitmap(this.props.clearSelectedItems, this.handleUpdateImage);
         }
     }
     componentWillUnmount () {
@@ -103,6 +121,9 @@ class PaintEditor extends React.Component {
             case Modes.BIT_LINE:
                 this.props.changeMode(Modes.LINE);
                 break;
+            case Modes.BIT_RECT:
+                this.props.changeMode(Modes.RECT);
+                break;
             default:
                 this.props.changeMode(Modes.BRUSH);
             }
@@ -114,20 +135,28 @@ class PaintEditor extends React.Component {
             case Modes.LINE:
                 this.props.changeMode(Modes.BIT_LINE);
                 break;
+            case Modes.RECT:
+                this.props.changeMode(Modes.BIT_RECT);
+                break;
             default:
                 this.props.changeMode(Modes.BIT_BRUSH);
             }
         }
     }
     handleUpdateImage (skipSnapshot) {
-        if (isBitmap(this.props.format)) {
+        // If in the middle of switching formats, rely on the current mode instead of format.
+        let actualFormat = this.props.format;
+        if (this.isSwitchingFormats) {
+            actualFormat = BitmapModes[this.props.mode] ? Formats.BITMAP : Formats.VECTOR;
+        }
+        if (isBitmap(actualFormat)) {
             const rect = getHitBounds(getRaster());
             this.props.onUpdateImage(
                 false /* isVector */,
                 getRaster().getImageData(rect),
                 (ART_BOARD_WIDTH / 2) - rect.x,
                 (ART_BOARD_HEIGHT / 2) - rect.y);
-        } else if (isVector(this.props.format)) {
+        } else if (isVector(actualFormat)) {
             const guideLayers = hideGuideLayers(true /* includeRaster */);
 
             // Export at 0.5x
@@ -150,7 +179,7 @@ class PaintEditor extends React.Component {
         }
 
         if (!skipSnapshot) {
-            performSnapshot(this.props.undoSnapshot, this.props.format);
+            performSnapshot(this.props.undoSnapshot, actualFormat);
         }
     }
     handleUndo () {

src/containers/paper-canvas.jsx

@@ -7,7 +7,6 @@ import Formats from '../lib/format';
 import Modes from '../lib/modes';
 import log from '../log/log';
 
-import {convertToBitmap, convertToVector} from '../helper/bitmap';
 import {performSnapshot} from '../helper/undo';
 import {undoSnapshot, clearUndoState} from '../reducers/undo';
 import {isGroup, ungroupItems} from '../helper/group';
@@ -21,8 +20,6 @@ import {clearPasteOffset} from '../reducers/clipboard';
 import {updateViewBounds} from '../reducers/view-bounds';
 import {changeFormat} from '../reducers/format';
 
-import {isVector, isBitmap} from '../lib/format';
-
 import styles from './paper-canvas.css';
 
 class PaperCanvas extends React.Component {
@@ -56,10 +53,6 @@ class PaperCanvas extends React.Component {
         if (this.props.imageId !== newProps.imageId) {
             this.switchCostume(
                 newProps.imageFormat, newProps.image, newProps.rotationCenterX, newProps.rotationCenterY);
-        } else if (isVector(this.props.format) && newProps.format === Formats.BITMAP) {
-            convertToBitmap(this.props.clearSelectedItems, this.props.onUpdateImage);
-        } else if (isBitmap(this.props.format) && newProps.format === Formats.VECTOR) {
-            convertToVector(this.props.clearSelectedItems, this.props.onUpdateImage);
         }
     }
     componentWillUnmount () {
@@ -260,12 +253,11 @@ PaperCanvas.propTypes = {
     clearPasteOffset: PropTypes.func.isRequired,
     clearSelectedItems: PropTypes.func.isRequired,
     clearUndo: PropTypes.func.isRequired,
-    format: PropTypes.oneOf(Object.keys(Formats)), // Internal, up-to-date data format
     image: PropTypes.oneOfType([
         PropTypes.string,
         PropTypes.instanceOf(HTMLImageElement)
     ]),
-    imageFormat: PropTypes.string, // The incoming image's data format, used during import
+    imageFormat: PropTypes.string, // The incoming image's data format, used during import. The user could switch this.
     imageId: PropTypes.string,
     mode: PropTypes.oneOf(Object.keys(Modes)),
     onUpdateImage: PropTypes.func.isRequired,

src/helper/bit-tools/rect-tool.js

@@ -0,0 +1,152 @@
+import paper from '@scratch/paper';
+import Modes from '../../lib/modes';
+import {drawRect} from '../bitmap';
+import {getRaster} from '../layer';
+import {clearSelection} from '../selection';
+import BoundingBoxTool from '../selection-tools/bounding-box-tool';
+import NudgeTool from '../selection-tools/nudge-tool';
+
+/**
+ * Tool for drawing rects.
+ */
+class RectTool extends paper.Tool {
+    static get TOLERANCE () {
+        return 6;
+    }
+    /**
+     * @param {function} setSelectedItems Callback to set the set of selected items in the Redux state
+     * @param {function} clearSelectedItems Callback to clear the set of selected items in the Redux state
+     * @param {!function} onUpdateImage A callback to call when the image visibly changes
+     */
+    constructor (setSelectedItems, clearSelectedItems, onUpdateImage) {
+        super();
+        this.setSelectedItems = setSelectedItems;
+        this.clearSelectedItems = clearSelectedItems;
+        this.onUpdateImage = onUpdateImage;
+        this.boundingBoxTool = new BoundingBoxTool(Modes.BIT_RECT, setSelectedItems, clearSelectedItems, onUpdateImage);
+        const nudgeTool = new NudgeTool(this.boundingBoxTool, onUpdateImage);
+        
+        // We have to set these functions instead of just declaring them because
+        // paper.js tools hook up the listeners in the setter functions.
+        this.onMouseDown = this.handleMouseDown;
+        this.onMouseDrag = this.handleMouseDrag;
+        this.onMouseUp = this.handleMouseUp;
+        this.onKeyUp = nudgeTool.onKeyUp;
+        this.onKeyDown = nudgeTool.onKeyDown;
+
+        this.rect = null;
+        this.color = null;
+        this.active = false;
+    }
+    getHitOptions () {
+        return {
+            segments: false,
+            stroke: true,
+            curves: false,
+            fill: true,
+            guide: false,
+            match: hitResult =>
+                (hitResult.item.data && hitResult.item.data.isHelperItem) ||
+                    hitResult.item === this.rect, // Allow hits on bounding box and rect only
+            tolerance: RectTool.TOLERANCE / paper.view.zoom
+        };
+    }
+    /**
+     * Should be called if the selection changes to update the bounds of the bounding box.
+     * @param {Array<paper.Item>} selectedItems Array of selected items.
+     */
+    onSelectionChanged (selectedItems) {
+        this.boundingBoxTool.onSelectionChanged(selectedItems);
+        if ((!this.rect || !this.rect.parent) &&
+                selectedItems && selectedItems.length === 1 && selectedItems[0].shape === 'rectangle') {
+            // Infer that an undo occurred and get back the active rect
+            this.rect = selectedItems[0];
+        } else if (this.rect && this.rect.parent && !this.rect.selected) {
+            // Rectangle got deselected
+            this.commitRect();
+        }
+    }
+    setColor (color) {
+        this.color = color;
+    }
+    handleMouseDown (event) {
+        if (event.event.button > 0) return; // only first mouse button
+        this.active = true;
+
+        if (this.boundingBoxTool.onMouseDown(event, false /* clone */, false /* multiselect */, this.getHitOptions())) {
+            this.isBoundingBoxMode = true;
+        } else {
+            this.isBoundingBoxMode = false;
+            clearSelection(this.clearSelectedItems);
+            this.commitRect();
+        }
+    }
+    handleMouseDrag (event) {
+        if (event.event.button > 0 || !this.active) return; // only first mouse button
+
+        if (this.isBoundingBoxMode) {
+            this.boundingBoxTool.onMouseDrag(event);
+            return;
+        }
+
+        const dimensions = event.point.subtract(event.downPoint);
+        const baseRect = new paper.Rectangle(event.downPoint, event.point);
+        if (event.modifiers.shift) {
+            baseRect.height = baseRect.width;
+            dimensions.y = event.downPoint.y > event.point.y ? -Math.abs(baseRect.width) : Math.abs(baseRect.width);
+        }
+        if (this.rect) this.rect.remove();
+        this.rect = new paper.Shape.Rectangle(baseRect);
+        this.rect.fillColor = this.color;
+        
+        if (event.modifiers.alt) {
+            this.rect.position = event.downPoint;
+        } else {
+            this.rect.position = event.downPoint.add(dimensions.multiply(.5));
+        }
+    }
+    handleMouseUp (event) {
+        if (event.event.button > 0 || !this.active) return; // only first mouse button
+        
+        if (this.isBoundingBoxMode) {
+            this.boundingBoxTool.onMouseUp(event);
+            this.isBoundingBoxMode = null;
+            return;
+        }
+
+        if (this.rect) {
+            if (Math.abs(this.rect.size.width * this.rect.size.height) < RectTool.TOLERANCE / paper.view.zoom) {
+                // Tiny shape created unintentionally?
+                this.rect.remove();
+                this.rect = null;
+            } else {
+                // Hit testing does not work correctly unless the width and height are positive
+                this.rect.size = new paper.Point(Math.abs(this.rect.size.width), Math.abs(this.rect.size.height));
+                this.rect.selected = true;
+                this.setSelectedItems();
+            }
+        }
+        this.active = false;
+    }
+    commitRect () {
+        if (!this.rect || !this.rect.parent) return;
+
+        const tmpCanvas = document.createElement('canvas');
+        tmpCanvas.width = getRaster().width;
+        tmpCanvas.height = getRaster().height;
+        const context = tmpCanvas.getContext('2d');
+        context.fillStyle = this.color;
+        drawRect(this.rect, context);
+        getRaster().drawImage(tmpCanvas, new paper.Point());
+
+        this.rect.remove();
+        this.rect = null;
+        this.onUpdateImage();
+    }
+    deactivateTool () {
+        this.commitRect();
+        this.boundingBoxTool.removeBoundsPath();
+    }
+}
+
+export default RectTool;

src/helper/bitmap.js

@@ -209,9 +209,135 @@ const convertToVector = function (clearSelectedItems, onUpdateImage) {
     onUpdateImage();
 };
 
+const getColor_ = function (x, y, context) {
+    return context.getImageData(x, y, 1, 1).data;
+};
+
+const matchesColor_ = function (x, y, imageData, oldColor) {
+    const index = ((y * imageData.width) + x) * 4;
+    return (
+        imageData.data[index + 0] === oldColor[0] &&
+        imageData.data[index + 1] === oldColor[1] &&
+        imageData.data[index + 2] === oldColor[2] &&
+        imageData.data[index + 3 ] === oldColor[3]
+    );
+};
+
+const colorPixel_ = function (x, y, imageData, newColor) {
+    const index = ((y * imageData.width) + x) * 4;
+    imageData.data[index + 0] = newColor[0];
+    imageData.data[index + 1] = newColor[1];
+    imageData.data[index + 2] = newColor[2];
+    imageData.data[index + 3] = newColor[3];
+};
+
+/**
+ * Flood fill beginning at the given point.
+ * Based on http://www.williammalone.com/articles/html5-canvas-javascript-paint-bucket-tool/
+ *
+ * @param {!int} x The x coordinate on the context at which to begin
+ * @param {!int} y The y coordinate on the context at which to begin
+ * @param {!ImageData} imageData The image data to edit
+ * @param {!Array<number>} newColor The color to replace with. A length 4 array [r, g, b, a].
+ * @param {!Array<number>} oldColor The color to replace. A length 4 array [r, g, b, a].
+ *     This must be different from newColor.
+ * @param {!Array<Array<int>>} stack The stack of pixels we need to look at
+ */
+const floodFillInternal_ = function (x, y, imageData, newColor, oldColor, stack) {
+    while (y > 0 && matchesColor_(x, y - 1, imageData, oldColor)) {
+        y--;
+    }
+    let lastLeftMatchedColor = false;
+    let lastRightMatchedColor = false;
+    for (; y < imageData.height; y++) {
+        if (!matchesColor_(x, y, imageData, oldColor)) break;
+        colorPixel_(x, y, imageData, newColor);
+        if (x > 0) {
+            if (matchesColor_(x - 1, y, imageData, oldColor)) {
+                if (!lastLeftMatchedColor) {
+                    stack.push([x - 1, y]);
+                    lastLeftMatchedColor = true;
+                }
+            } else {
+                lastLeftMatchedColor = false;
+            }
+        }
+        if (x < imageData.width - 1) {
+            if (matchesColor_(x + 1, y, imageData, oldColor)) {
+                if (!lastRightMatchedColor) {
+                    stack.push([x + 1, y]);
+                    lastRightMatchedColor = true;
+                }
+            } else {
+                lastRightMatchedColor = false;
+            }
+        }
+    }
+};
+
+/**
+ * Flood fill beginning at the given point
+ * @param {!int} x The x coordinate on the context at which to begin
+ * @param {!int} y The y coordinate on the context at which to begin
+ * @param {!HTMLCanvas2DContext} context The context in which to draw
+ */
+const floodFill = function (x, y, context) {
+    const oldColor = getColor_(x, y, context);
+    context.fillRect(x, y, 1, 1);
+    const newColor = getColor_(x, y, context);
+    const imageData = context.getImageData(0, 0, context.canvas.width, context.canvas.height);
+    if (matchesColor_(x, y, imageData, oldColor)) { // no-op
+        return;
+    }
+    colorPixel_(x, y, imageData, newColor); // Restore old color to avoid affecting result
+    const stack = [[x, y]];
+    while (stack.length) {
+        const pop = stack.pop();
+        floodFillInternal_(pop[0], pop[1], imageData, newColor, oldColor, stack);
+    }
+    context.putImageData(imageData, 0, 0);
+};
+
+/**
+ * @param {!paper.Shape.Rectangle} rect The rectangle to draw to the canvas
+ * @param {!HTMLCanvas2DContext} context The context in which to draw
+ */
+const drawRect = function (rect, context) {
+    // No rotation component to matrix
+    if (rect.matrix.b === 0 && rect.matrix.c === 0) {
+        const width = rect.size.width * rect.matrix.a;
+        const height = rect.size.height * rect.matrix.d;
+        context.fillRect(
+            ~~(rect.matrix.tx - (width / 2)),
+            ~~(rect.matrix.ty - (height / 2)),
+            ~~width,
+            ~~height);
+        return;
+    }
+    const startPoint = rect.matrix.transform(new paper.Point(-rect.size.width / 2, -rect.size.height / 2));
+    const widthPoint = rect.matrix.transform(new paper.Point(rect.size.width / 2, -rect.size.height / 2));
+    const heightPoint = rect.matrix.transform(new paper.Point(-rect.size.width / 2, rect.size.height / 2));
+    const endPoint = rect.matrix.transform(new paper.Point(rect.size.width / 2, rect.size.height / 2));
+    const center = rect.matrix.transform(new paper.Point());
+    forEachLinePoint(startPoint, widthPoint, (x, y) => {
+        context.fillRect(x, y, 1, 1);
+    });
+    forEachLinePoint(startPoint, heightPoint, (x, y) => {
+        context.fillRect(x, y, 1, 1);
+    });
+    forEachLinePoint(endPoint, widthPoint, (x, y) => {
+        context.fillRect(x, y, 1, 1);
+    });
+    forEachLinePoint(endPoint, heightPoint, (x, y) => {
+        context.fillRect(x, y, 1, 1);
+    });
+    floodFill(~~center.x, ~~center.y, context);
+};
+
 export {
     convertToBitmap,
     convertToVector,
+    drawRect,
     getBrushMark,
     getHitBounds,
     fillEllipse,

src/lib/modes.js

@@ -3,6 +3,7 @@ import keyMirror from 'keymirror';
 const Modes = keyMirror({
     BIT_BRUSH: null,
     BIT_LINE: null,
+    BIT_RECT: null,
     BRUSH: null,
     ERASER: null,
     LINE: null,
@@ -15,4 +16,13 @@ const Modes = keyMirror({
     TEXT: null
 });
 
-export default Modes;
+const BitmapModes = keyMirror({
+    BIT_BRUSH: null,
+    BIT_LINE: null,
+    BIT_RECT: null
+});
+
+export {
+    Modes as default,
+    BitmapModes
+};