REPORT-8125 水印 设计器配置界面与实 时预览=>核心功能完成

designer-base/src/com/fr/design/report/WatermarkPreviewPane.java

@@ -3,15 +3,30 @@ package com.fr.design.report;
 import com.fr.base.Watermark;
 import com.fr.design.constants.UIConstants;
 import com.fr.general.FRFont;
+import com.fr.stable.StringUtils;
 
 import javax.swing.JPanel;
+import java.awt.Color;
+import java.awt.FontMetrics;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.image.BufferedImage;
 
 /**
  * Created by plough on 2018/5/15.
  */
 public class WatermarkPreviewPane extends JPanel {
-    Watermark watermark;
+    private static final double SCALE_FACTOR = 3;  // 水印层的放大比例
+    private static final int ROTATE_DEGREE = -20;  // 旋转角度
+    // 绘制水印层的坐标，用来控制图层偏移
+    private static final int MARK_X = 0;
+    private static final int MARK_Y = -120;
+
+    private int horizontalGap = 20;  // 水平间隔（一个中文字符宽度）
+    private int verticalGap = 40;  // 垂直间隔（两个中文字符宽度）
+    private Watermark watermark;
+
 
     public WatermarkPreviewPane() {
         this.watermark = new Watermark();
@@ -26,12 +41,44 @@ public class WatermarkPreviewPane extends JPanel {
         super.repaint();
     }
 
+    private void updateGap(FontMetrics fontMetrics) {
+        horizontalGap = fontMetrics.stringWidth("帆");
+        verticalGap = horizontalGap * 2;
+    }
+
+    private int getLineHeight() {
+        return horizontalGap;
+    }
+
+    private BufferedImage paintWatermark() {
+        int width = (int)(this.getWidth() * SCALE_FACTOR);
+        int height = (int)(this.getHeight() * SCALE_FACTOR);
+        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
+        Graphics g = image.getGraphics();
+        g.setColor(watermark.getColor());
+        g.setFont(FRFont.getInstance().applySize(watermark.getFontSize()));
+        updateGap(g.getFontMetrics());
+        for (int y = getLineHeight(); y < height; y += verticalGap) {
+            for (int x = 0; x < width; x += horizontalGap) {
+                g.drawString(watermark.getText(), x, y);
+                x += g.getFontMetrics().stringWidth(watermark.getText());
+            }
+            y += getLineHeight();
+        }
+        return image;
+    }
+
     @Override
     public void paint(Graphics g) {
         super.paint(g);
-        g.drawImage(UIConstants.WATERMARK_BACKGROUND, 0, 0, this.getWidth(), this.getHeight(), null);
-        g.setColor(watermark.getColor());
-        g.setFont(FRFont.getInstance().applySize(watermark.getFontSize()));
-        g.drawString(watermark.getText(), 20, 20);
+        Graphics2D g2d = (Graphics2D)g;
+        g2d.drawImage(UIConstants.WATERMARK_BACKGROUND, 0, 0, this.getWidth(), this.getHeight(), null);
+        BufferedImage markImage = paintWatermark();
+        g2d.rotate(
+            Math.toRadians(ROTATE_DEGREE),
+            (double) markImage.getWidth() / 2,
+            (double) markImage.getHeight() / 2
+        );
+        g.drawImage(markImage, MARK_X, MARK_Y, null);
     }
 }