piskel/js/drawingtools/Rectangle.js

/*
 * @provide pskl.drawingtools.Rectangle
 *
 * @require pskl.utils
 */
(function() {
  var ns = $.namespace("pskl.drawingtools");

  ns.Rectangle = function() {
    this.toolId = "tool-rectangle";
    this.helpText = "Rectangle tool";
    
    // Rectangle's first point coordinates (set in applyToolAt)
    this.startCol = null;
    this.startRow = null;
  };

  pskl.utils.inherit(ns.Rectangle, ns.BaseTool);
  
  /**
   * @override
   */
  ns.Rectangle.prototype.applyToolAt = function(col, row, color, frame, overlay) {
    this.startCol = col;
    this.startRow = row;
    
    // Drawing the first point of the rectangle in the fake overlay canvas:
    overlay.setPixel(col, row, color);
  };

  ns.Rectangle.prototype.moveToolAt = function(col, row, color, frame, overlay) {
    overlay.clear();
    if(color == Constants.TRANSPARENT_COLOR) {
      color = Constants.SELECTION_TRANSPARENT_COLOR;
    }

    // draw in overlay
    this.drawRectangle_(col, row, color, overlay);
  };

  /**
   * @override
   */
  ns.Rectangle.prototype.releaseToolAt = function(col, row, color, frame, overlay) {    
    overlay.clear();
    if(frame.containsPixel(col, row)) { // cancel if outside of canvas
      // draw in frame to finalize
      this.drawRectangle_(col, row, color, frame);
    }
  };

  ns.Rectangle.prototype.drawRectangle_ = function (col, row, color, targetFrame) {
    var strokePoints = pskl.PixelUtils.getBoundRectanglePixels(this.startCol, this.startRow, col, row);
    for(var i = 0; i< strokePoints.length; i++) {
      // Change model:
      targetFrame.setPixel(strokePoints[i].col, strokePoints[i].row, color);
    }
  };
})();