X-Git-Url: http://www2.svjatoslav.eu/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Feu%2Fsvjatoslav%2Fsixth%2Fe3d%2Fgui%2FRenderingContext.java;h=a5f7fb70018ae2c6d6a4162a6b13fd62cd74bbd4;hb=a3ff3683bd0a025061667b26b6fcf56fe20f0afc;hp=b6417e5aa7a66b1377bea912b6b64209baf8ccb3;hpb=a377e3094d304bbc815b36edc2eb303ec023ea48;p=sixth-3d.git

diff --git a/src/main/java/eu/svjatoslav/sixth/e3d/gui/RenderingContext.java b/src/main/java/eu/svjatoslav/sixth/e3d/gui/RenderingContext.java
index b6417e5..a5f7fb7 100644
--- a/src/main/java/eu/svjatoslav/sixth/e3d/gui/RenderingContext.java
+++ b/src/main/java/eu/svjatoslav/sixth/e3d/gui/RenderingContext.java
@@ -1,9 +1,10 @@
 /*
- * Sixth 3D engine. Author: Svjatoslav Agejenko. 
+ * Sixth 3D engine. Author: Svjatoslav Agejenko.
  * This project is released under Creative Commons Zero (CC0) license.
  */
 package eu.svjatoslav.sixth.e3d.gui;
 
+import eu.svjatoslav.sixth.e3d.geometry.Point2D;
 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseEvent;
 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseInteractionController;
 
@@ -19,56 +20,45 @@ public class RenderingContext {
     public final byte[] pixels;
     public final int width;
     public final int height;
-    public final int xCenter;
-    public final int yCenter;
+    /**
+     * Center of the screen in screen space (pixels).
+     * This is the point where (0,0) coordinate of the world space is rendered.
+     */
+    public final Point2D centerCoordinate;
+
+    /**
+     * Zoom factor. The bigger the value, the more zoomed in the view is.
+     */
     public final double zoom;
     final BufferedImage bufferedImage;
+    /**
+     * Number of frame that is currently being rendered.
+     * Every frame has its own number.
+     */
     public int frameNumber = 0;
 
     /**
      * UI component that mouse is currently hovering over.
      */
     private MouseInteractionController objectPreviouslyUnderMouseCursor;
-
-    public void prepareForNewFrameRendering(){
-        mouseEvent = null;
-        currentObjectUnderMouseCursor = null;
-    }
-
     /**
      * Mouse click event that needs to be processed.
+     * This event is processed only once per frame.
+     * If there are multiple objects under mouse cursor, the top-most object will receive the event.
+     * If there are no objects under mouse cursor, the event will be ignored.
+     * If there is no event, this field will be null.
+     * This field is set to null after the event is processed.
      */
-    private  MouseEvent mouseEvent;
-
-    public void setMouseEvent(MouseEvent mouseEvent) {
-        this.mouseEvent = mouseEvent;
-    }
-
-    public MouseEvent getMouseEvent() {
-        return mouseEvent;
-    }
-
+    private MouseEvent mouseEvent;
     /**
-     * Item that user clicked on.
+     * UI component that mouse is currently hovering over.
      */
     private MouseInteractionController currentObjectUnderMouseCursor;
 
-    /**
-     * Called when given object was detected under mouse cursor, while processing {@link #mouseEvent}.
-     * Because objects are rendered back to front. The last method caller will set the top-most object, if
-     * there are multiple objects under mouse cursor.
-     */
-    public void setCurrentObjectUnderMouseCursor(MouseInteractionController currentObjectUnderMouseCursor) {
-        this.currentObjectUnderMouseCursor = currentObjectUnderMouseCursor;
-    }
-
     public RenderingContext(final int width, final int height) {
         this.width = width;
         this.height = height;
-
-        this.xCenter = width / 2;
-        this.yCenter = height / 2;
-
+        this.centerCoordinate = new Point2D(width / 2d, height / 2d);
         this.zoom = width / 3d;
 
         bufferedImage = new BufferedImage(width, height, bufferedImageType);
@@ -82,8 +72,30 @@ public class RenderingContext {
         graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
     }
 
+    public void prepareForNewFrameRendering() {
+        mouseEvent = null;
+        currentObjectUnderMouseCursor = null;
+    }
+
+    public MouseEvent getMouseEvent() {
+        return mouseEvent;
+    }
+
+    public void setMouseEvent(MouseEvent mouseEvent) {
+        this.mouseEvent = mouseEvent;
+    }
+
+    /**
+     * Called when given object was detected under mouse cursor, while processing {@link #mouseEvent}.
+     * Because objects are rendered back to front. The last method caller will set the top-most object, if
+     * there are multiple objects under mouse cursor.
+     */
+    public void setCurrentObjectUnderMouseCursor(MouseInteractionController currentObjectUnderMouseCursor) {
+        this.currentObjectUnderMouseCursor = currentObjectUnderMouseCursor;
+    }
+
     /**
-     * @return <code>true</code> if view repaint is needed.
+     * @return <code>true</code> if view update is needed as a consequence of this mouse event.
      */
     public boolean handlePossibleComponentMouseEvent() {
         if (mouseEvent == null) return false;