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.geometry.Point2D;
   8 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseEvent;
   9 import eu.svjatoslav.sixth.e3d.gui.humaninput.MouseInteractionController;
  10
  11 import java.awt.*;
  12 import java.awt.image.BufferedImage;
  13 import java.awt.image.DataBufferByte;
  14 import java.awt.image.WritableRaster;
  15
  16 public class RenderingContext {
  17
  18     public static final int bufferedImageType = BufferedImage.TYPE_4BYTE_ABGR;
  19     public final Graphics2D graphics;
  20     public final byte[] pixels;
  21     public final int width;
  22     public final int height;
  23     /**
  24      * Center of the screen in screen space (pixels).
  25      * This is the point where (0,0) coordinate of the world space is rendered.
  26      */
  27     public final Point2D centerCoordinate;
  28
  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 objectPreviouslyUnderMouseCursor;
  37
  38     public void prepareForNewFrameRendering(){
  39         mouseEvent = null;
  40         currentObjectUnderMouseCursor = 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 currentObjectUnderMouseCursor;
  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 setCurrentObjectUnderMouseCursor(MouseInteractionController currentObjectUnderMouseCursor) {
  67         this.currentObjectUnderMouseCursor = currentObjectUnderMouseCursor;
  68     }
  69
  70     public RenderingContext(final int width, final int height) {
  71         this.width = width;
  72         this.height = height;
  73         this.centerCoordinate = new Point2D(width / 2d, height / 2d);
  74         this.zoom = width / 3d;
  75
  76         bufferedImage = new BufferedImage(width, height, bufferedImageType);
  77
  78         final WritableRaster raster = bufferedImage.getRaster();
  79         final DataBufferByte dbi = (DataBufferByte) raster.getDataBuffer();
  80         pixels = dbi.getData();
  81
  82         graphics = (Graphics2D) bufferedImage.getGraphics();
  83         graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  84         graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
  85     }
  86
  87     /**
  88      * @return <code>true</code> if view repaint is needed.
  89      */
  90     public boolean handlePossibleComponentMouseEvent() {
  91         if (mouseEvent == null) return false;
  92
  93         boolean viewRepaintNeeded = false;
  94
  95         if (objectPreviouslyUnderMouseCursor != currentObjectUnderMouseCursor) {
  96             // Mouse cursor has just entered or left component.
  97             viewRepaintNeeded = objectPreviouslyUnderMouseCursor != null && objectPreviouslyUnderMouseCursor.mouseExited();
  98             viewRepaintNeeded |= currentObjectUnderMouseCursor != null && currentObjectUnderMouseCursor.mouseEntered();
  99             objectPreviouslyUnderMouseCursor = currentObjectUnderMouseCursor;
 100         }
 101
 102         if (mouseEvent.button != 0 && currentObjectUnderMouseCursor != null) {
 103             // Mouse button was clicked on some component.
 104             viewRepaintNeeded |= currentObjectUnderMouseCursor.mouseClicked(mouseEvent.button);
 105         }
 106
 107         return viewRepaintNeeded;
 108     }
 109
 110 }