2 * Sixth 3D engine. Author: Svjatoslav Agejenko.
3 * This project is released under Creative Commons Zero (CC0) license.
5 package eu.svjatoslav.sixth.e3d.gui;
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;
12 import java.awt.image.BufferedImage;
13 import java.awt.image.DataBufferByte;
14 import java.awt.image.WritableRaster;
16 public class RenderingContext {
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;
24 * Center of the screen in screen space (pixels).
25 * This is the point where (0,0) coordinate of the world space is rendered.
27 public final Point2D centerCoordinate;
29 public final double zoom;
30 final BufferedImage bufferedImage;
31 public int frameNumber = 0;
34 * UI component that mouse is currently hovering over.
36 private MouseInteractionController objectPreviouslyUnderMouseCursor;
38 public void prepareForNewFrameRendering(){
40 currentObjectUnderMouseCursor = null;
44 * Mouse click event that needs to be processed.
46 private MouseEvent mouseEvent;
48 public void setMouseEvent(MouseEvent mouseEvent) {
49 this.mouseEvent = mouseEvent;
52 public MouseEvent getMouseEvent() {
57 * Item that user clicked on.
59 private MouseInteractionController currentObjectUnderMouseCursor;
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.
66 public void setCurrentObjectUnderMouseCursor(MouseInteractionController currentObjectUnderMouseCursor) {
67 this.currentObjectUnderMouseCursor = currentObjectUnderMouseCursor;
70 public RenderingContext(final int width, final int height) {
73 this.centerCoordinate = new Point2D(width / 2d, height / 2d);
74 this.zoom = width / 3d;
76 bufferedImage = new BufferedImage(width, height, bufferedImageType);
78 final WritableRaster raster = bufferedImage.getRaster();
79 final DataBufferByte dbi = (DataBufferByte) raster.getDataBuffer();
80 pixels = dbi.getData();
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);
88 * @return <code>true</code> if view repaint is needed.
90 public boolean handlePossibleComponentMouseEvent() {
91 if (mouseEvent == null) return false;
93 boolean viewRepaintNeeded = false;
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;
102 if (mouseEvent.button != 0 && currentObjectUnderMouseCursor != null) {
103 // Mouse button was clicked on some component.
104 viewRepaintNeeded |= currentObjectUnderMouseCursor.mouseClicked(mouseEvent.button);
107 return viewRepaintNeeded;