1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package fx83dfeatures;
  26 
  27 import javafx.application.Application;
  28 import javafx.event.EventHandler;
  29 import javafx.scene.Group;
  30 import javafx.scene.PerspectiveCamera;
  31 import javafx.scene.Scene;
  32 import javafx.scene.input.MouseEvent;
  33 import javafx.scene.paint.Color;
  34 import javafx.scene.shape.Rectangle;
  35 import javafx.stage.Stage;
  36 
  37 public class NearAndFarClipTest extends Application {
  38 
  39     private static final double OFFSET_PERCENT = 0.01; // 1 percent tolerance
  40     private static final int WIDTH = 500;
  41     private static final int HEIGHT = 500;
  42     private static final double FOV = 30.0;
  43     private static final double NEAR = 0.1;
  44     private static final double FAR = 10.0;
  45 
  46     private Scene createClipPlanes(Stage stage) {
  47         stage.setTitle("Near and Far Clip Test");
  48 
  49         final double tanOfHalfFOV = Math.tan(Math.toRadians(FOV) / 2.0);
  50         final double halfHeight = HEIGHT / 2;
  51         final double focalLength = halfHeight / tanOfHalfFOV;
  52         final double eyePositionZ = -1.0 * focalLength;
  53         final double nearClipDistance = focalLength * NEAR + eyePositionZ;
  54         final double farClipDistance = focalLength * FAR + eyePositionZ;
  55         final double nearClipDistanceOffset = Math.abs(nearClipDistance * OFFSET_PERCENT);
  56         final double farClipDistanceOffset = Math.abs(farClipDistance * OFFSET_PERCENT);
  57 
  58         System.out.println("In scene coordinate: focalLength = " + focalLength
  59                 + ", nearClipDistance = " + nearClipDistance
  60                 + ", nearClipDistanceOffset = " + nearClipDistanceOffset
  61                 + ", farClipDistance = " + farClipDistance
  62                 + ", farClipDistanceOffset = " + farClipDistanceOffset);
  63 
  64         Rectangle insideRect = new Rectangle(220, 220, Color.GREEN);
  65         insideRect.setLayoutX(140);
  66         insideRect.setLayoutY(140);
  67         insideRect.setId("Green");
  68 
  69         Rectangle insideNearClip = new Rectangle(16, 16, Color.BLUE);
  70         insideNearClip.setLayoutX(242);
  71         insideNearClip.setLayoutY(242);
  72         insideNearClip.setTranslateZ(nearClipDistance + nearClipDistanceOffset);
  73         insideNearClip.setId("Blue");
  74 
  75         Rectangle outsideNearClip = new Rectangle(16, 16, Color.YELLOW);
  76         outsideNearClip.setLayoutX(242);
  77         outsideNearClip.setLayoutY(242);
  78         outsideNearClip.setTranslateZ(nearClipDistance - nearClipDistanceOffset);
  79         outsideNearClip.setId("Yellow");
  80 
  81         Rectangle insideFarClip = new Rectangle(3000, 3000, Color.RED);
  82         insideFarClip.setTranslateX(-1250);
  83         insideFarClip.setTranslateY(-1250);
  84         insideFarClip.setTranslateZ(farClipDistance - farClipDistanceOffset);
  85         insideFarClip.setId("Red");
  86 
  87         Rectangle outsideFarClip = new Rectangle(4000, 4000, Color.CYAN);
  88         outsideFarClip.setTranslateX(-1750);
  89         outsideFarClip.setTranslateY(-1750);
  90         outsideFarClip.setTranslateZ(farClipDistance + farClipDistanceOffset);
  91         outsideFarClip.setId("Cyan");
  92 
  93         Group root = new Group();
  94 
  95         // Render in painter order (far to near)
  96         root.getChildren().addAll(outsideFarClip, insideFarClip, insideRect, insideNearClip, outsideNearClip);
  97 
  98         // Intentionally set depth buffer to false to reduce test complexity
  99         Scene scene = new Scene(root, WIDTH, HEIGHT, false);
 100         scene.setOnMousePressed(new EventHandler<MouseEvent>() {
 101             @Override public void handle(MouseEvent event) {
 102                 System.out.println("Clicked: " + event.getTarget());
 103             }
 104         });
 105 
 106 
 107         PerspectiveCamera camera = new PerspectiveCamera();
 108         camera.setFieldOfView(FOV);
 109         camera.setNearClip(NEAR);
 110         camera.setFarClip(FAR);
 111         scene.setCamera(camera);
 112         return scene;
 113     }
 114 
 115     @Override public void start(Stage stage) {
 116         Scene scene = createClipPlanes(stage);
 117         scene.setFill(Color.GRAY);
 118         stage.setScene(scene);
 119         stage.sizeToScene();
 120         stage.setResizable(false);
 121         stage.show();
 122         System.out.println("You should expect to see 3 overlapping squares in"
 123                 + " the order of Blue is on top of Green and Green is on top Red.");;
 124     }
 125 
 126     public static void main(String[] args) {
 127         Application.launch(args);
 128     }
 129 
 130 }