src/main/java/eu/svjatoslav/sixth/e3d/gui/RenderingContext.java

   1 /*
   2  * Sixth 3D engine. Copyright ©2012-2019, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 3 of the GNU Lesser General Public License
   6  * or later as published by the Free Software Foundation.
   7  *
   8  */
   9
  10 package eu.svjatoslav.sixth.e3d.gui;
  11
  12 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseEvent;
  13 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseInteractionController;
  14
  15 import java.awt.*;
  16 import java.awt.image.BufferedImage;
  17 import java.awt.image.DataBufferByte;
  18 import java.awt.image.WritableRaster;
  19
  20 public class RenderingContext {
  21
  22     public static final int bufferedImageType = BufferedImage.TYPE_4BYTE_ABGR;
  23     public final Graphics2D graphics;
  24     public final byte[] pixels;
  25     public final int width;
  26     public final int height;
  27     public final int xCenter;
  28     public final int yCenter;
  29     public final double zoom;
  30     final BufferedImage bufferedImage;
  31     public int frameNumber = 0;
  32
  33     /**
  34      * UI component that mouse is currently hovering over.
  35      */
  36     private MouseInteractionController currentMouseOverComponent;
  37
  38     public void prepareForNewFrameRendering(){
  39         mouseEvent = null;
  40         objectUnderMouse = null;
  41     }
  42
  43     /**
  44      * Mouse click event that needs to be processed.
  45      */
  46     private  MouseEvent mouseEvent;
  47
  48     public void setMouseEvent(MouseEvent mouseEvent) {
  49         this.mouseEvent = mouseEvent;
  50     }
  51
  52     public MouseEvent getMouseEvent() {
  53         return mouseEvent;
  54     }
  55
  56     /**
  57      * Item that user clicked on.
  58      */
  59     private MouseInteractionController objectUnderMouse;
  60
  61     /**
  62      * Called when given object was detected under mouse cursor, while processing {@link #mouseEvent}.
  63      * Because objects are rendered back to front. The last method caller will set the top-most object, if
  64      * there are multiple objects under mouse cursor.
  65      */
  66     public void setObjectUnderMouse(MouseInteractionController objectUnderMouse) {
  67         this.objectUnderMouse = objectUnderMouse;
  68     }
  69
  70     public RenderingContext(final int width, final int height) {
  71         this.width = width;
  72         this.height = height;
  73
  74         this.xCenter = width / 2;
  75         this.yCenter = height / 2;
  76
  77         this.zoom = width / 3d;
  78
  79         bufferedImage = new BufferedImage(width, height, bufferedImageType);
  80
  81         final WritableRaster raster = bufferedImage.getRaster();
  82         final DataBufferByte dbi = (DataBufferByte) raster.getDataBuffer();
  83         pixels = dbi.getData();
  84
  85         graphics = (Graphics2D) bufferedImage.getGraphics();
  86         graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  87         graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
  88     }
  89
  90     /**
  91      * @return <code>true</code> if view repaint is needed.
  92      */
  93     public boolean handleDetectedComponentMouseEvents() {
  94         if (objectUnderMouse != null) {
  95             if (mouseEvent.button == 0) {
  96                 // mouse over
  97                 if (currentMouseOverComponent == null) {
  98                     currentMouseOverComponent = objectUnderMouse;
  99                     return currentMouseOverComponent.mouseEntered();
 100                 } else if (currentMouseOverComponent != objectUnderMouse) {
 101                     boolean viewRepaintNeeded = currentMouseOverComponent.mouseExited();
 102                     currentMouseOverComponent = objectUnderMouse;
 103                     return viewRepaintNeeded | currentMouseOverComponent.mouseEntered();
 104                 }
 105             } else {
 106                 // mouse click
 107                 return objectUnderMouse.mouseClicked();
 108             }
 109         } else if (currentMouseOverComponent != null) {
 110             boolean viewRepaintNeeded = currentMouseOverComponent.mouseExited();
 111             currentMouseOverComponent = null;
 112             return viewRepaintNeeded;
 113         }
 114         return false;
 115     }
 116
 117 }