com.googlecode.blaisemath.graphics.swing.LabeledShapeGraphic Maven / Gradle / Ivy

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Scene graph and style library using Java2D graphics.
There is a newer version: 3.0.16
package com.googlecode.blaisemath.graphics.swing;

/*
 * #%L
 * BlaiseGraphics
 * --
 * Copyright (C) 2009 - 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.graphics.swing.render.WrappedTextRenderer;
import com.googlecode.blaisemath.graphics.swing.render.ShapeRenderer;
import com.google.common.base.Strings;
import com.googlecode.blaisemath.graphics.DelegatingPrimitiveGraphic;
import com.googlecode.blaisemath.style.AttributeSet;
import com.googlecode.blaisemath.style.ObjectStyler;
import com.googlecode.blaisemath.graphics.Renderer;
import com.googlecode.blaisemath.primitive.AnchoredText;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.RectangularShape;

/**
 * Customizable graphic that represents a labeled item.
 * Uses an {@link ObjectStyler} to customize appearance.
 *
 * @param  type of item
 *
 * @author Elisha Peterson
 */
public class LabeledShapeGraphic extends DelegatingPrimitiveGraphic {

    private Renderer textRenderer = new WrappedTextRenderer();
    
    public LabeledShapeGraphic() {
        this(null, new Rectangle(), new ObjectStyler<>());
    }

    public LabeledShapeGraphic(O source, Shape primitive, ObjectStyler styler) {
        super(source, primitive, styler, ShapeRenderer.getInstance());
    }
    
    //region PROPERTIES

    public Renderer getTextRenderer() {
        return textRenderer;
    }

    public void setTextRenderer(Renderer textRenderer) {
        if (this.textRenderer != textRenderer) {
            this.textRenderer = textRenderer;
            fireGraphicChanged();
        }
    }
    
    //endregion
    
    @Override
    public void renderTo(Graphics2D canvas) {
        super.renderTo(canvas);

        if (styler.getLabelDelegate() != null) {
            String label = styler.label(source);
            AttributeSet style = styler.labelStyle(source);
            renderLabel(canvas, primitive, label, style);
        }
    }
    
    private void renderLabel(Graphics2D canvas, Shape primitive, String label, AttributeSet style) {
        if (Strings.isNullOrEmpty(label) || style == null) {
            return;
        }
        if (textRenderer instanceof WrappedTextRenderer) {
            WrappedTextRenderer wtr = (WrappedTextRenderer) textRenderer;
            wtr.setTextBounds(wrappedLabelBounds(primitive));
        }
        textRenderer.render(new AnchoredText(label), style, canvas);
    }

    /**
     * Get the bounding box used for wrapped text labels for the given shape.
     * @param primitive shape
     * @return label boundaries
     */
    public static RectangularShape wrappedLabelBounds(Shape primitive) {
        return primitive instanceof RectangularShape
                    ? (RectangularShape) primitive
                    : primitive.getBounds2D();
    }

}