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

   1 /*
   2  * Sixth 3D engine. Author: Svjatoslav Agejenko.
   3  * This project is released under Creative Commons Zero (CC0) license.
   4  *
   5 *
   6  */
   7
   8 package eu.svjatoslav.sixth.e3d.gui;
   9
  10 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseEvent;
  11 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseInteractionController;
  12
  13 import java.awt.*;
  14 import java.awt.image.BufferedImage;
  15 import java.awt.image.DataBufferByte;
  16 import java.awt.image.WritableRaster;
  17
  18 public class RenderingContext {
  19
  20     public static final int bufferedImageType = BufferedImage.TYPE_4BYTE_ABGR;
  21     public final Graphics2D graphics;
  22     public final byte[] pixels;
  23     public final int width;
  24     public final int height;
  25     public final int xCenter;
  26     public final int yCenter;
  27     public final double zoom;
  28     final BufferedImage bufferedImage;
  29     public int frameNumber = 0;
  30
  31     /**
  32      * UI component that mouse is currently hovering over.
  33      */
  34     private MouseInteractionController currentMouseOverComponent;
  35
  36     public void prepareForNewFrameRendering(){
  37         mouseEvent = null;
  38         objectUnderMouse = null;
  39     }
  40
  41     /**
  42      * Mouse click event that needs to be processed.
  43      */
  44     private  MouseEvent mouseEvent;
  45
  46     public void setMouseEvent(MouseEvent mouseEvent) {
  47         this.mouseEvent = mouseEvent;
  48     }
  49
  50     public MouseEvent getMouseEvent() {
  51         return mouseEvent;
  52     }
  53
  54     /**
  55      * Item that user clicked on.
  56      */
  57     private MouseInteractionController objectUnderMouse;
  58
  59     /**
  60      * Called when given object was detected under mouse cursor, while processing {@link #mouseEvent}.
  61      * Because objects are rendered back to front. The last method caller will set the top-most object, if
  62      * there are multiple objects under mouse cursor.
  63      */
  64     public void setObjectUnderMouse(MouseInteractionController objectUnderMouse) {
  65         this.objectUnderMouse = objectUnderMouse;
  66     }
  67
  68     public RenderingContext(final int width, final int height) {
  69         this.width = width;
  70         this.height = height;
  71
  72         this.xCenter = width / 2;
  73         this.yCenter = height / 2;
  74
  75         this.zoom = width / 3d;
  76
  77         bufferedImage = new BufferedImage(width, height, bufferedImageType);
  78
  79         final WritableRaster raster = bufferedImage.getRaster();
  80         final DataBufferByte dbi = (DataBufferByte) raster.getDataBuffer();
  81         pixels = dbi.getData();
  82
  83         graphics = (Graphics2D) bufferedImage.getGraphics();
  84         graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  85         graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
  86     }
  87
  88     /**
  89      * @return <code>true</code> if view repaint is needed.
  90      */
  91     public boolean handleDetectedComponentMouseEvents() {
  92         if (objectUnderMouse != null) {
  93             if (mouseEvent.button == 0) {
  94                 // mouse over
  95                 if (currentMouseOverComponent == null) {
  96                     currentMouseOverComponent = objectUnderMouse;
  97                     return currentMouseOverComponent.mouseEntered();
  98                 } else if (currentMouseOverComponent != objectUnderMouse) {
  99                     boolean viewRepaintNeeded = currentMouseOverComponent.mouseExited();
 100                     currentMouseOverComponent = objectUnderMouse;
 101                     return viewRepaintNeeded | currentMouseOverComponent.mouseEntered();
 102                 }
 103             } else {
 104                 // mouse click
 105                 return objectUnderMouse.mouseClicked();
 106             }
 107         } else if (currentMouseOverComponent != null) {
 108             boolean viewRepaintNeeded = currentMouseOverComponent.mouseExited();
 109             currentMouseOverComponent = null;
 110             return viewRepaintNeeded;
 111         }
 112         return false;
 113     }
 114
 115 }