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