com.googlecode.blaisemath.svg.render.StyleWriter Maven / Gradle / Ivy

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package com.googlecode.blaisemath.svg.render;

/*-
 * #%L
 * blaise-svg
 * --
 * Copyright (C) 2014 - 2020 Elisha Peterson
 * --
 * 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.
 * #L%
 */

import com.googlecode.blaisemath.style.AttributeSet;
import com.googlecode.blaisemath.style.AttributeSetCoder;
import com.googlecode.blaisemath.style.Styles;
import com.googlecode.blaisemath.util.Colors;
import org.checkerframework.checker.nullness.qual.Nullable;

import java.awt.*;

public class StyleWriter {

    public static String id(AttributeSet style) {
        return style.getString(Styles.ID);
    }

    /**
     * Converts style object to SVG-compatible string representation
     * @param style input style
     * @return style string
     */
    public static String toString(AttributeSet style) {
        return new AttributeSetCoder().encode(svgCompatibleCopy(style));
    }

    /**
     * Creates a copy of the input style set for SVG styles.
     * @param style input style
     * @return style
     */
    private static @Nullable AttributeSet svgCompatibleCopy(@Nullable AttributeSet style) {
        if (style == null) {
            return null;
        }
        AttributeSet res = style.copy();
        // TODO - update opacity keys for alpha colors
        for (String c : style.getAttributes()) {
            Object col = style.get(c);
            if (col instanceof Color) {
                res.put(c, Colors.alpha((Color) col, 255));
            }
        }
        return res;
    }
}