equidistant stamping fix

src/main/java/de/ph87/kindermalen/drawing/DrawingPanel.java

@@ -26,24 +26,13 @@ public class DrawingPanel extends JPanel {
   }
 
   private void onPress(final MouseEvent e) {
-    lastPoint = new Vector(e.getPoint());
     drawing.getCurrent().newRevision();
-    toolBox.getTool().apply(drawing.getCurrent().getCurrent(), e.getX(), e.getY());
+    lastPoint = toolBox.getTool().apply(null, drawing.getCurrent().getCurrent(), new Vector(e.getPoint()));
     repaint();
   }
 
   private void onDrag(final MouseEvent e) {
-    final Vector vector = new Vector(lastPoint, e.getPoint());
-    int i = 0;
-    for (int rest = (int) Math.floor(vector.length); rest >= 20; rest -= 20) {
-      System.out.println(rest);
-      toolBox.getTool().apply(drawing.getCurrent().getCurrent(), e.getX(), e.getY());
-      lastPoint = lastPoint.plus(vector.withLength(20));
-      i++;
-      if (i > 100) {
-        break;
-      }
-    }
+    lastPoint = toolBox.getTool().apply(lastPoint, drawing.getCurrent().getCurrent(), new Vector(e.getPoint()));
     repaint();
   }
 

src/main/java/de/ph87/kindermalen/drawing/Layer.java

@@ -31,7 +31,10 @@ public class Layer {
 
   public void newRevision() {
     if (canRedo()) {
-      history = history.subList(0, index + 1);
+      final int old = history.size();
+      final int keep = index + 1;
+      history = history.subList(0, keep);
+      log.info("{} Revisions deleted", old - keep);
     }
     current = copy();
     index = history.size();

src/main/java/de/ph87/kindermalen/drawing/Vector.java

@@ -14,7 +14,7 @@ public class Vector {
     this(point.x, point.y);
   }
 
-  public Vector(final Vector start, final Point end) {
+  public Vector(final Vector start, final Vector end) {
     this(end.x - start.x, end.y - start.y);
   }
 
@@ -26,11 +26,19 @@ public class Vector {
 
   public Vector withLength(final double newLength) {
     final double factor = newLength / length;
-    return new Vector(x / factor, y / factor);
+    return new Vector(x * factor, y * factor);
   }
 
   public Vector plus(final Vector other) {
     return new Vector(x + other.x, y + other.y);
   }
 
+  public int intY() {
+    return (int) Math.round(y);
+  }
+
+  public int intX() {
+    return (int) Math.round(x);
+  }
+
 }

src/main/java/de/ph87/kindermalen/tool/Tool.java

@@ -1,5 +1,6 @@
 package de.ph87.kindermalen.tool;
 
+import de.ph87.kindermalen.drawing.Vector;
 import lombok.Getter;
 
 import java.awt.image.BufferedImage;
@@ -13,6 +14,6 @@ public abstract class Tool {
     this.name = name;
   }
 
-  public abstract void apply(final BufferedImage image, final int x, final int y);
+  public abstract Vector apply(final Vector last, final BufferedImage image, final Vector point);
 
 }

src/main/java/de/ph87/kindermalen/tool/stamp/StampTool.java

@@ -1,5 +1,6 @@
 package de.ph87.kindermalen.tool.stamp;
 
+import de.ph87.kindermalen.drawing.Vector;
 import de.ph87.kindermalen.tool.Tool;
 import lombok.Getter;
 import lombok.ToString;
@@ -91,8 +92,22 @@ public class StampTool extends Tool {
   }
 
   @Override
-  public void apply(final BufferedImage destination, final int x, final int y) {
-    destination.getGraphics().drawImage(prepared, x - prepared.getWidth() / 2, y - prepared.getHeight() / 2, null);
+  public Vector apply(Vector last, final BufferedImage destination, final Vector current) {
+    if (last == null) {
+      apply(destination, current);
+      return current;
+    }
+    final Vector vector = new Vector(last, current);
+    for (int rest = (int) Math.floor(vector.length); rest >= 20; rest -= 20) {
+      final Vector point = last.plus(vector.withLength(20));
+      apply(destination, point);
+      last = point;
+    }
+    return last;
+  }
+
+  private void apply(final BufferedImage destination, final Vector point) {
+    destination.getGraphics().drawImage(prepared, point.intX() - prepared.getWidth() / 2, point.intY() - prepared.getHeight() / 2, null);
   }
 
 }