Changeset 7425 in josm for trunk/src/org/openstreetmap/josm/gui/layer/ImageryLayer.java

Timestamp:

2014-08-16T23:50:43+02:00 (10 years ago)

Author:

Don-vip

Message:

fix #3916 - WMS: Improve exception handling. Proper message is now displayed on tiles.

File:

• trunk/src/org/openstreetmap/josm/gui/layer/ImageryLayer.java (modified) (4 diffs)

trunk/src/org/openstreetmap/josm/gui/layer/ImageryLayer.java

@@ -9 +9 @@
 import java.awt.Component;
 import java.awt.Font;
-import java.awt.Graphics;
+import java.awt.Graphics2D;
 import java.awt.GridBagLayout;
 import java.awt.event.ActionEvent;
+import java.awt.font.FontRenderContext;
+import java.awt.font.LineBreakMeasurer;
+import java.awt.font.TextAttribute;
+import java.awt.font.TextLayout;
 import java.awt.image.BufferedImage;
 import java.awt.image.BufferedImageOp;
 import java.awt.image.ConvolveOp;
 import java.awt.image.Kernel;
+import java.text.AttributedCharacterIterator;
+import java.text.AttributedString;
+import java.util.Hashtable;
 import java.util.List;
+import java.util.Map;
 
 import javax.swing.AbstractAction;
@@ -68 +76 @@
     private final ImageryAdjustAction adjustAction = new ImageryAdjustAction(this);
 
+    /**
+     * Constructs a new {@code ImageryLayer}.
+     */
     public ImageryLayer(ImageryInfo info) {
         super(info.getName());
@@ -81 +92 @@
     }
 
-    public double getPPD(){
+    public double getPPD() {
         if (!Main.isDisplayingMapView()) return Main.getProjection().getDefaultZoomInPPD();
         ProjectionBounds bounds = Main.map.mapView.getProjectionBounds();
@@ -231 +242 @@
     }
 
-    public void drawErrorTile(BufferedImage img) {
-        Graphics g = img.getGraphics();
+    /**
+     * Draws a red error tile when imagery tile cannot be fetched.
+     * @param img The buffered image
+     * @param message Additional error message to display
+     */
+    public void drawErrorTile(BufferedImage img, String message) {
+        Graphics2D g = (Graphics2D) img.getGraphics();
         g.setColor(Color.RED);
         g.fillRect(0, 0, img.getWidth(), img.getHeight());
-        g.setFont(g.getFont().deriveFont(Font.PLAIN).deriveFont(36.0f));
+        g.setFont(g.getFont().deriveFont(Font.PLAIN).deriveFont(24.0f));
         g.setColor(Color.BLACK);
 
         String text = tr("ERROR");
-        g.drawString(text, (img.getWidth() + g.getFontMetrics().stringWidth(text)) / 2, img.getHeight()/2);
-    }
-
-    /* (non-Javadoc)
-     * @see org.openstreetmap.josm.gui.layer.Layer#destroy()
-     */
+        g.drawString(text, (img.getWidth() - g.getFontMetrics().stringWidth(text)) / 2, g.getFontMetrics().getHeight()+5);
+        if (message != null) {
+            float drawPosY = 2.5f*g.getFontMetrics().getHeight()+10;
+            if (!message.contains(" ")) {
+                g.setFont(g.getFont().deriveFont(Font.PLAIN).deriveFont(18.0f));
+                g.drawString(message, 5, (int)drawPosY);
+            } else {
+                // Draw message on several lines
+                Map<TextAttribute, Object> map = new Hashtable<TextAttribute, Object>();
+                map.put(TextAttribute.FAMILY, "Serif");
+                map.put(TextAttribute.SIZE, new Float(18.0));
+                AttributedString vanGogh = new AttributedString(message, map);
+                // Create a new LineBreakMeasurer from the text
+                AttributedCharacterIterator paragraph = vanGogh.getIterator();
+                int paragraphStart = paragraph.getBeginIndex();
+                int paragraphEnd = paragraph.getEndIndex();
+                FontRenderContext frc = g.getFontRenderContext();
+                LineBreakMeasurer lineMeasurer = new LineBreakMeasurer(paragraph, frc);
+                // Set break width to width of image with some margin
+                float breakWidth = img.getWidth()-10;
+                // Set position to the index of the first character in the text
+                lineMeasurer.setPosition(paragraphStart);
+                // Get lines until the entire paragraph has been displayed
+                while (lineMeasurer.getPosition() < paragraphEnd) {
+                    // Retrieve next layout
+                    TextLayout layout = lineMeasurer.nextLayout(breakWidth);
+
+                    // Compute pen x position
+                    float drawPosX = layout.isLeftToRight() ? 0 : breakWidth - layout.getAdvance();
+
+                    // Move y-coordinate by the ascent of the layout
+                    drawPosY += layout.getAscent();
+
+                    // Draw the TextLayout at (drawPosX, drawPosY)
+                    layout.draw(g, drawPosX, drawPosY);
+
+                    // Move y-coordinate in preparation for next layout
+                    drawPosY += layout.getDescent() + layout.getLeading();
+                }
+            }
+        }
+    }
+
     @Override
     public void destroy() {