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 objectPreviouslyUnderMouseCursor;
  32
  33     public void prepareForNewFrameRendering(){
  34         mouseEvent = null;
  35         currentObjectUnderMouseCursor = 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 currentObjectUnderMouseCursor;
  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 setCurrentObjectUnderMouseCursor(MouseInteractionController currentObjectUnderMouseCursor) {
  62         this.currentObjectUnderMouseCursor = currentObjectUnderMouseCursor;
  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 handlePossibleComponentMouseEvent() {
  89         if (mouseEvent == null) return false;
  90
  91         boolean viewRepaintNeeded = false;
  92
  93         if (objectPreviouslyUnderMouseCursor != currentObjectUnderMouseCursor) {
  94             // Mouse cursor has just entered or left component.
  95             viewRepaintNeeded = objectPreviouslyUnderMouseCursor != null && objectPreviouslyUnderMouseCursor.mouseExited();
  96             viewRepaintNeeded |= currentObjectUnderMouseCursor != null && currentObjectUnderMouseCursor.mouseEntered();
  97             objectPreviouslyUnderMouseCursor = currentObjectUnderMouseCursor;
  98         }
  99
 100         if (mouseEvent.button != 0 && currentObjectUnderMouseCursor != null) {
 101             // Mouse button was clicked on some component.
 102             viewRepaintNeeded |= currentObjectUnderMouseCursor.mouseClicked(mouseEvent.button);
 103         }
 104
 105         return viewRepaintNeeded;
 106     }
 107
 108 }