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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ide.common.vectordrawable;
import com.android.annotations.NonNull;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import java.awt.geom.AffineTransform;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Parent class for a SVG file's node, can be either group or leave element.
*/
abstract class SvgNode {
private static Logger logger = Logger.getLogger(SvgNode.class.getSimpleName());
private static final String TRANSFORM_TAG = "transform";
private static final String MATRIX_ATTRIBUTE = "matrix";
private static final String TRANSLATE_ATTRIBUTE = "translate";
private static final String ROTATE_ATTRIBUTE = "rotate";
private static final String SCALE_ATTRIBUTE = "scale";
private static final String SKEWX_ATTRIBUTE = "skewX";
private static final String SKEWY_ATTRIBUTE = "skewY";
protected String mName;
// Keep a reference to the tree in order to dump the error log.
private SvgTree mSvgTree;
// Use document node to get the line number for error reporting.
private Node mDocumentNode;
// Key is the attributes for vector drawable, and the value is the converted from SVG.
protected Map mVdAttributesMap = new HashMap();
// If mLocalTransform is identity, it is the same as not having any transformation.
protected AffineTransform mLocalTransform = new AffineTransform();
// During the flattern() operatation, we need to merge the transformation from top down.
// This is the stacked transformation. And this will be used for the path data transform().
protected AffineTransform mStackedTransform = new AffineTransform();
/**
* While parsing the translate() rotate() ..., update the mLocalTransform
*/
public SvgNode(SvgTree svgTree, Node node, String name) {
mName = name;
mSvgTree = svgTree;
mDocumentNode = node;
// Parse and generate a presentation map.
NamedNodeMap a = node.getAttributes();
int len = a.getLength();
for (int itemIndex = 0; itemIndex < len; itemIndex++) {
Node n = a.item(itemIndex);
String nodeName = n.getNodeName();
String nodeValue = n.getNodeValue();
// TODO: Handle style here. Refer to Svg2Vector::addStyleToPath().
if (Svg2Vector.presentationMap.containsKey(nodeName)) {
fillPresentationAttributes(nodeName, nodeValue, logger);
}
if (TRANSFORM_TAG.equals(nodeName)) {
logger.log(Level.FINE, nodeName + " " + nodeValue);
parseLocalTransform(nodeValue);
}
}
}
private void parseLocalTransform(String nodeValue) {
// We separate the string into multiple parts and look like this:
// "translate" "30" "rotate" "4.5e1 5e1 50"
nodeValue = nodeValue.replaceAll(",", " ");
String[] matrices = nodeValue.split("\\(|\\)");
AffineTransform parsedTransform;
for (int i = 0; i < matrices.length -1; i += 2) {
parsedTransform = parseOneTransform(matrices[i].trim(), matrices[i+1].trim());
if (parsedTransform != null) {
mLocalTransform.concatenate(parsedTransform);
}
}
}
@NonNull
private AffineTransform parseOneTransform(String type, String data) {
float[] numbers = getNumbers(data);
int numLength = numbers.length;
AffineTransform parsedTranform = new AffineTransform();
if (MATRIX_ATTRIBUTE.equalsIgnoreCase(type)) {
if (numLength != 6) {
return null;
}
parsedTranform.setTransform(numbers[0], numbers[1], numbers[2],
numbers[3], numbers[4], numbers[5]);
} else if (TRANSLATE_ATTRIBUTE.equalsIgnoreCase(type)) {
if (numLength != 1 && numLength != 2) {
return null;
}
// Default translateY is 0
parsedTranform.translate(numbers[0], numLength == 2 ? numbers[1] : 0);
} else if (SCALE_ATTRIBUTE.equalsIgnoreCase(type)) {
if (numLength != 1 && numLength != 2) {
return null;
}
// Default scaleY == scaleX
parsedTranform.scale(numbers[0], numLength == 2 ? numbers[1] : numbers[0]);
} else if (ROTATE_ATTRIBUTE.equalsIgnoreCase(type)) {
if (numLength != 1 && numLength != 3) {
return null;
}
parsedTranform.rotate(Math.toRadians(numbers[0]),
numLength == 3 ? numbers[1] : 0,
numLength == 3 ? numbers[2] : 0);
} else if (SKEWX_ATTRIBUTE.equalsIgnoreCase(type)) {
if (numLength != 1) {
return null;
}
// Note that Swing is pass the shear value directly to the matrix as m01 or m10,
// while SVG is using tan(a) in the matrix and a is in radians.
parsedTranform.shear(Math.tan(Math.toRadians(numbers[0])), 0);
} else if (SKEWY_ATTRIBUTE.equalsIgnoreCase(type)) {
if (numLength != 1) {
return null;
}
parsedTranform.shear(0, Math.tan(Math.toRadians(numbers[0])));
}
return parsedTranform;
}
private float[] getNumbers(String data) {
String[] numbers = data.split("\\s+");
int len = numbers.length;
if (len == 0) {
return null;
}
float[] results = new float[len];
for (int i = 0; i < len; i ++) {
results[i] = Float.parseFloat(numbers[i]);
}
return results;
}
protected SvgTree getTree() {
return mSvgTree;
}
public String getName() {
return mName;
}
public Node getDocumentNode() {
return mDocumentNode;
}
/**
* dump the current node's debug info.
*/
public abstract void dumpNode(String indent);
/**
* Write the Node content into the VectorDrawable's XML file.
*/
public abstract void writeXML(OutputStreamWriter writer) throws IOException;
/**
* @return true the node is a group node.
*/
public abstract boolean isGroupNode();
/**
* Transform the current Node with the transformation matrix.
*/
public abstract void transformIfNeeded(AffineTransform finalTransform);
protected void fillPresentationAttributes(String name, String value, Logger logger) {
logger.log(Level.FINE, ">>>> PROP " + name + " = " + value);
if (value.startsWith("url(")) {
getTree().logErrorLine("Unsupported URL value: " + value, getDocumentNode(),
SvgTree.SvgLogLevel.ERROR);
return;
}
mVdAttributesMap.put(name, value);
}
public void fillEmptyAttributes(Map parentAttributesMap) {
// Go through the parents' attributes, if the child misses any, then fill it.
for (Map.Entry entry : parentAttributesMap.entrySet()) {
String key = entry.getKey();
if (!mVdAttributesMap.containsKey(key)) {
mVdAttributesMap.put(key, entry.getValue());
}
}
}
public abstract void flattern(AffineTransform transform);
}
