design/designer-form/src/main/java/com/fr/design/designer/ui/ImgPanel.java

package com.fr.design.designer.ui;

import com.fr.general.ImageWithSuffix;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.JComponent;


/**
*
* <p>图片控件中的已选图片展示面板</p>
*
* @author Jimmy.Zheng created on 2022/8/11 21:17
**/
public class ImgPanel extends JComponent {
    private static final long serialVersionUID = 1L;
    private Image backgroundImage;
    private int imageDisplayMode;
    private int modeIndex;

    public ImgPanel() {
        this(null, 0);
    }

    public ImgPanel(Image image, int modeName) {
        setBackgroundImage(image);
        setImageDisplayMode(modeName);
    }

    public void setBackgroundImage(Image image) {
        this.backgroundImage = image;
        repaint();
    }

    public Image getBackgroundImage() {
        return this.backgroundImage;
    }

    public void setImageDisplayMode(int modeName) {
        if (modeName == 1) {
            this.modeIndex = 0;
        }

        if (modeName == 0) {
            this.imageDisplayMode = 0;
            this.modeIndex = 1;
        }

        if (modeName == 2) {
            this.imageDisplayMode = 2;
            this.modeIndex = 2;
        }
        if (modeName == 4) {
            this.imageDisplayMode = 4;
            this.modeIndex = 3;
        }
        repaint();
    }

    public int getImageDisplayMode() {
        return this.imageDisplayMode;
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        if (this.backgroundImage != null) {
            if (this.backgroundImage instanceof ImageWithSuffix) {
                this.backgroundImage = ((ImageWithSuffix) backgroundImage).getImage();
            }
            int width = getWidth();
            int height = getHeight();
            int imageWidth = this.backgroundImage.getWidth(this);
            int imageHeight = this.backgroundImage.getHeight(this);

            switch (this.modeIndex) {
                case 0:
                    int x = (width - imageWidth) / 2;
                    int y = (height - imageHeight) / 2;
                    g.drawImage(this.backgroundImage, x, y, this);
                    break;
                case 1:
                    for (int ix = 0; ix < width; ix += imageWidth) {
                        for (int iy = 0; iy < height; iy += imageHeight) {
                            g.drawImage(this.backgroundImage, ix, iy, this);
                        }
                    }

                    break;
                case 2:
                    g.drawImage(this.backgroundImage, 0, 0, width, height, this);
                    break;
                case 3:
                    double sx = 1.0 * width / imageWidth;
                    double sy = 1.0 * height / imageHeight;

                    if (sx > sy) {
                        sx = sy;
                        width = (int) (sx * imageWidth);
                    } else {
                        sy = sx;
                        height = (int) (sy * imageHeight);
                    }
                    int xx = (getWidth() - width) / 2;
                    int yy = (getHeight() - height) / 2;
                    g.drawImage(this.backgroundImage, xx, yy, width, height, this);
            }
        }
    }
}