speed up of drawing

src/main/java/de/neemann/digital/draw/elements/VisualElement.java

@@ -29,6 +29,7 @@ public class VisualElement implements Drawable, Moveable, AttributeListener {
     private transient InteractorInterface interactor;
     private transient Element element;
     private transient ShapeFactory shapeFactory;
+    private transient Transform transform;
 
     private final String elementName;
     private final ElementAttributes elementAttributes;
@@ -43,7 +44,7 @@ public class VisualElement implements Drawable, Moveable, AttributeListener {
     public VisualElement(String elementName) {
         this.elementName = elementName;
         elementAttributes = new ElementAttributes();
-        pos = new Vector(0, 0);
+        setPos(new Vector(0, 0));
     }
 
     /**
@@ -54,7 +55,7 @@ public class VisualElement implements Drawable, Moveable, AttributeListener {
     public VisualElement(VisualElement proto) {
         this.elementName = proto.elementName;
         this.elementAttributes = new ElementAttributes(proto.elementAttributes);
-        this.pos = new Vector(proto.pos);
+        setPos(new Vector(proto.pos));
     }
 
     /**
@@ -91,6 +92,7 @@ public class VisualElement implements Drawable, Moveable, AttributeListener {
     public VisualElement setPos(Vector pos) {
         this.pos = pos;
         minMax = null;
+        transform=null;
         return this;
     }
 
@@ -167,11 +169,14 @@ public class VisualElement implements Drawable, Moveable, AttributeListener {
     }
 
     private Transform createTransform() {
+        if (transform==null) {
             int rotate = getRotate();
             if (rotate == 0)
-            return v -> v.add(pos);
+                transform = v -> v.add(pos);
             else
-            return new TransformRotate(pos, rotate);
+                transform = new TransformRotate(pos, rotate);
+        }
+        return transform;
     }
 
     /**
@@ -188,8 +193,7 @@ public class VisualElement implements Drawable, Moveable, AttributeListener {
 
     @Override
     public void move(Vector delta) {
-        pos = pos.add(delta);
+        setPos(pos.add(delta));
-        minMax = null;
     }
 
     /**
@@ -303,6 +307,7 @@ public class VisualElement implements Drawable, Moveable, AttributeListener {
     @Override
     public void attributeChanged(Key key) {
         shape = null;
+        transform=null;
     }
 
     @Override

src/main/java/de/neemann/digital/draw/graphics/GraphicSwing.java

@@ -15,6 +15,8 @@ import static de.neemann.digital.core.element.ElementAttributes.cleanLabel;
 public class GraphicSwing implements Graphic {
 
     private final Graphics2D gr;
+    private final int minFontSize;
+    private int pixelSize;
     private Style lastStyle;
 
     /**
@@ -23,7 +25,19 @@ public class GraphicSwing implements Graphic {
      * @param gr the {@link Graphics2D} instave to use.
      */
     public GraphicSwing(Graphics2D gr) {
+        this(gr, 1);
+    }
+
+    /**
+     * Creates a new instance
+     *
+     * @param gr        the {@link Graphics2D} instave to use.
+     * @param pixelSize the size of one pixel
+     */
+    public GraphicSwing(Graphics2D gr, int pixelSize) {
         this.gr = gr;
+        this.pixelSize = pixelSize;
+        this.minFontSize = pixelSize * 3;
         gr.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
     }
 
@@ -59,14 +73,16 @@ public class GraphicSwing implements Graphic {
 
     @Override
     public void drawCircle(Vector p1, Vector p2, Style style) {
+        Vector w = Vector.width(p1, p2);
+        if (w.x > pixelSize || w.y > pixelSize) {
             applyStyle(style);
             Vector p = Vector.min(p1, p2);
-        Vector w = Vector.width(p1, p2);
             if (style.isFilled())
                 gr.fillOval(p.x - 1, p.y - 1, w.x + 2, w.y + 2);
             else
                 gr.drawOval(p.x, p.y, w.x, w.y);
         }
+    }
 
     private void applyStyle(Style style) {
         if (style != lastStyle) {
@@ -79,6 +95,9 @@ public class GraphicSwing implements Graphic {
 
     @Override
     public void drawText(Vector p1, Vector p2, String text, Orientation orientation, Style style) {
+        applyStyle(style); // sets also font size!
+        int height = gr.getFontMetrics().getHeight();
+        if (height > minFontSize) {
             if (text == null || text.length() == 0) return;
 
             //GraphicMinMax.approxTextSize(this, p1, p2, text, orientation, style);
@@ -105,8 +124,6 @@ public class GraphicSwing implements Graphic {
                 gr.translate(-p1.x, -p1.y);
             }
 
-
-        applyStyle(style);
             int xoff = 0;
             if (orientation.getX() != 0) {
                 int width = gr.getFontMetrics().stringWidth(text);
@@ -115,7 +132,6 @@ public class GraphicSwing implements Graphic {
 
             int yoff = 0;
             if (orientation.getY() != 0) {
-            int height = gr.getFontMetrics().getHeight();
                 yoff += height * orientation.getY() / 3;
             }
 
@@ -123,7 +139,7 @@ public class GraphicSwing implements Graphic {
 
             if (rotateText)
                 gr.setTransform(old);
-
+        }
     }
 
 }

src/main/java/de/neemann/digital/gui/components/CircuitComponent.java

@@ -337,8 +337,10 @@ public class CircuitComponent extends JComponent {
         AffineTransform oldTrans = gr2.getTransform();
         gr2.transform(transform);
 
-        GraphicSwing gr = new GraphicSwing(gr2);
+        GraphicSwing gr = new GraphicSwing(gr2, (int) (2 / transform.getScaleX()));
+//        long time = System.currentTimeMillis();
         circuit.drawTo(gr, highLighted, modelSync);
+//        System.out.println(System.currentTimeMillis()-time);  // -agentlib:hprof=cpu=samples
 
         activeMouseController.drawTo(gr);
         gr2.setTransform(oldTrans);