/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview This implements a Photoshop script that can be used to generate
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* collision information for the AndouKun game engine. This tool walks over
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* each path in the current document and generates a list of edges and normals
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* in a new document. It is intended to be used on a file containing
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* graphical representations of the collision tiles used by the engine. Each
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* path in the file must be closed and may not contain any curved points
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* (the tool assumes that the line between any two points in a given path is
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* straight). Only one shape may be contained per path layer (each path must go
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* in its own path layer). This tool can also output a graphical version of its
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* edge calculation for debugging purposes.
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*/
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/* If set to true, the computation will be rendered graphically to the output
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file */
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var drawOutput = false;
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/* If true, the computation will be printed in a text layer in the
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output file.*/
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var printOutput = true;
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// Back up the ruler units that this file uses before switching to pixel units.
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var defaultRulerUnits = app.preferences.rulerUnits;
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app.preferences.rulerUnits = Units.PIXELS;
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var tileSizeX = prompt("Tile pixel width:");
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var tileSizeY = prompt("Tile pixel height:");
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var documentWidth = app.activeDocument.width;
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var documentHeight = app.activeDocument.height;
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var tilesPerRow = documentWidth / tileSizeX;
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var tilesPerColumn = documentHeight / tileSizeY;
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var tiles = new Array();
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tiles.length = tilesPerRow * tilesPerColumn;
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// Walk the list of paths and extract edges and normals. Store these in
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// an array by tile.
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var pathList = app.activeDocument.pathItems;
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for (pathIndex = 0; pathIndex < pathList.length; pathIndex++) {
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var main_path = pathList[pathIndex];
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if (main_path) {
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var itemList = main_path.subPathItems;
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if (!itemList) {
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alert("Path has no sub items!");
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} else {
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for (var x = 0; x < itemList.length; x++) {
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var item = itemList[x];
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var points = item.pathPoints;
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var tile = new Object;
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tile.edges = new Array();
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var totalX = 0;
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var totalY = 0;
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for (var y = 0; y < points.length; y++) {
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var firstPoint = points[y];
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var lastPoint = points[(y + 1) % points.length];
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var edge = new Object;
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edge.startX = firstPoint.anchor[0];
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edge.startY = firstPoint.anchor[1];
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edge.endX = lastPoint.anchor[0];
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edge.endY = lastPoint.anchor[1];
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var normalX = -(edge.endY - edge.startY);
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var normalY = edge.endX - edge.startX;
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var normalLength = Math.sqrt((normalX * normalX) + (normalY * normalY));
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normalX /= normalLength;
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normalY /= normalLength;
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edge.normalX = normalX;
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edge.normalY = normalY;
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if (normalX == 0 && normalY == 0) {
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alert("Zero length normal calculated at path " + pathIndex);
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}
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var normalLength2 = Math.sqrt((normalX * normalX) + (normalY * normalY));
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if (normalLength2 > 1 || normalLength2 < 0.9) {
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alert("Normal of invalid length (" + normalLength2 + ") found at path " + pathIndex);
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}
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totalX += edge.endX;
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totalY += edge.endY;
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var width = edge.endX - edge.startX;
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var height = edge.endY - edge.startY;
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edge.centerX = edge.endX - (width / 2);
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edge.centerY = edge.endY - (height / 2);
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tile.edges.push(edge);
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}
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totalX /= points.length;
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totalY /= points.length;
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tile.centerX = totalX;
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tile.centerY = totalY;
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var column = Math.floor(tile.centerX / tileSizeX);
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var row = Math.floor(tile.centerY / tileSizeY);
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tile.xOffset = column * tileSizeX;
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tile.yOffset = row * tileSizeY;
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tile.centerX -= tile.xOffset;
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tile.centerY -= tile.yOffset;
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var tileIndex = Math.floor(row * tilesPerRow + column);
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tiles[tileIndex] = tile;
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}
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}
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}
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}
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var outputString = "";
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// For each tile print the edges to a string.
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for (var x = 0; x < tiles.length; x++) {
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if (tiles[x]) {
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var tile = tiles[x];
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for (var y = 0; y < tile.edges.length; y++) {
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var edge = tile.edges[y];
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// convert to tile space
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edge.startX -= tile.xOffset;
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edge.startY -= tile.yOffset;
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edge.endX -= tile.xOffset;
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edge.endY -= tile.yOffset;
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edge.centerX -= tile.xOffset;
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edge.centerY -= tile.yOffset;
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// The normals that we calculated previously might be facing the wrong
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// direction. Detect this case and correct it by checking to see if
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// adding the normal to a point on the edge moves the point closer or
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// further from the center of the shape.
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if (Math.abs(edge.centerX - tile.centerX) >
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Math.abs((edge.centerX + edge.normalX) - tile.centerX)) {
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edge.normalX *= -1;
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edge.normalY *= -1;
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}
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if (Math.abs(edge.centerY - tile.centerY) >
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Math.abs((edge.centerY + edge.normalY) - tile.centerY)) {
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edge.normalX *= -1;
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edge.normalY *= -1;
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}
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// Convert to left-handed GL space (the origin is at the bottom-left).
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edge.normalY *= -1;
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edge.startY = tileSizeY - edge.startY;
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edge.endY = tileSizeY - edge.endY;
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edge.centerY = tileSizeY - edge.centerY;
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outputString += x + ":" + Math.floor(edge.startX) + "," +
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Math.floor(edge.startY) + ":" + Math.floor(edge.endX) + "," +
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Math.floor(edge.endY) + ":" + edge.normalX + "," + edge.normalY +
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"\r";
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}
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}
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}
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if (outputString.length > 0) {
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var newDoc = app.documents.add(600, 700, 72.0, "Edge Output",
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NewDocumentMode.RGB);
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if (drawOutput) {
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// Render the edges and normals to the new document.
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var pathLayer = newDoc.artLayers.add();
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newDoc.activeLayer = pathLayer;
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// draw the edges to make sure everything works
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var black = new SolidColor;
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black.rgb.red = 0;
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black.rgb.blue = 0;
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black.rgb.green = 0;
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var redColor = new SolidColor;
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redColor.rgb.red = 255;
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redColor.rgb.blue = 0;
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redColor.rgb.green = 0;
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var greenColor = new SolidColor;
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greenColor.rgb.red = 0;
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greenColor.rgb.blue = 0;
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greenColor.rgb.green = 255;
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var blueColor = new SolidColor;
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blueColor.rgb.red = 0;
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blueColor.rgb.blue = 255;
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blueColor.rgb.green = 0;
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var lineIndex = 0;
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for (var x = 0; x < tiles.length; x++) {
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if (tiles[x]) {
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var tile = tiles[x];
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var lineArray = new Array();
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var offsetX = Math.floor(x % tilesPerRow) * tileSizeX;
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var offsetY = Math.floor(x / tilesPerRow) * tileSizeY;
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for (var y = 0; y < tile.edges.length; y++) {
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var edge = tile.edges[y];
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lineArray[y] = Array(offsetX + edge.startX, offsetY + edge.startY);
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}
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// I tried to do this by stroking paths, but the documentation
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// provided by Adobe is faulty (their sample code doesn't run). The
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// same thing can be accomplished with selections instead.
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newDoc.selection.select(lineArray);
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newDoc.selection.stroke(black, 2);
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for (var y = 0; y < tile.edges.length; y++) {
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var edge = tile.edges[y];
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var normalX = Math.round(tile.centerX +
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(edge.normalX * (tileSizeX / 2)));
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var normalY = Math.round(tile.centerY +
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(edge.normalY * (tileSizeY / 2)));
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var tileCenterArray = new Array();
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tileCenterArray[0] = new Array(offsetX + tile.centerX - 1,
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offsetY + tile.centerY - 1);
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tileCenterArray[1] = new Array(offsetX + tile.centerX - 1,
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offsetY + tile.centerY + 1);
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tileCenterArray[2] = new Array(offsetX + tile.centerX + 1,
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offsetY + tile.centerY + 1);
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tileCenterArray[3] = new Array(offsetX + tile.centerX + 1,
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offsetY + tile.centerY - 1);
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tileCenterArray[4] = new Array(offsetX + normalX - 1,
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offsetY + normalY - 1);
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tileCenterArray[5] = new Array(offsetX + normalX + 1,
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offsetY + normalY + 1);
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tileCenterArray[6] = new Array(offsetX + tile.centerX,
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offsetY + tile.centerY);
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newDoc.selection.select(tileCenterArray);
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newDoc.selection.fill(redColor);
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var centerArray = new Array();
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centerArray[0] = new Array(offsetX + edge.centerX - 1,
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offsetY + edge.centerY - 1);
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centerArray[1] = new Array(offsetX + edge.centerX - 1,
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offsetY + edge.centerY + 1);
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centerArray[2] = new Array(offsetX + edge.centerX + 1,
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offsetY + edge.centerY + 1);
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centerArray[3] = new Array(offsetX + edge.centerX + 1,
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offsetY + edge.centerY - 1);
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newDoc.selection.select(centerArray);
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newDoc.selection.fill(greenColor);
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}
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}
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}
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}
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if (printOutput) {
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var textLayer = newDoc.artLayers.add();
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textLayer.kind = LayerKind.TEXT;
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textLayer.textItem.contents = outputString;
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}
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}
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preferences.rulerUnits = defaultRulerUnits;
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// Convenience function for clamping negative values to zero. Trying to select
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// areas outside the canvas causes Bad Things.
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function clamp(input) {
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if (input < 0) {
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return 0;
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}
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return input;
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}
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