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package javafx.scene;

import com.sun.javafx.geom.PickRay;
import com.sun.javafx.geom.Vec3d;
import com.sun.javafx.geom.transform.Affine3D;
import com.sun.javafx.geom.transform.GeneralTransform3D;
import com.sun.javafx.scene.DirtyBits;
import com.sun.javafx.sg.PGNode;
import com.sun.javafx.sg.PGPerspectiveCamera;
import com.sun.javafx.tk.Toolkit;
import javafx.application.ConditionalFeature;
import javafx.application.Platform;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleDoubleProperty;
import sun.util.logging.PlatformLogger;



/**
 * Specifies a perspective camera for rendering a scene.
 *
 * 

This camera defines a viewing volume for a perspective projection; * a truncated right pyramid. * The {@code fieldOfView} value can be used to change viewing volume. * This camera is always located at center of the scene and looks along the * positive z-axis. The coordinate system defined by this camera has its * origin in the upper left corner of the panel with the Y-axis pointing * down and the Z axis pointing away from the viewer (into the screen). * *

In the default camera, where fixedEyeAtCameraZero is false, the Z value * of the eye position is adjusted in Z such that the projection matrix generated * using the specified {@code fieldOfView} will produce units at * Z = 0 (the projection plane), in device-independent pixels, matches that of * the ParallelCamera. * When the Scene is resized, * the objects in the scene at the projection plane (Z = 0) will stay the same size, * but more or less content of the scene is viewable. * *

If fixedEyeAtCameraZero is true, the eye position is fixed at (0, 0, 0) * in the local coordinates of the camera. The projection matrix is generated * using the specified {@code fieldOfView} and the projection volume is mapped * onto the viewport (window) such that it is stretched over more or fewer * device-independent pixels at the projection plane. * When the Scene is resized, * the objects in the scene will shrink or grow proportionally, * but the visible portion of the content is unchanged. * *

We recommend setting fixedEyeAtCameraZero to true if you are going to * transform (move) the camera. Transforming the camera when fixedEyeAtCameraZero * is set to false may lead to results that are not intuitive. * *

Note that this is a conditional feature. See * {@link javafx.application.ConditionalFeature#SCENE3D ConditionalFeature.SCENE3D} * for more information. * * @since JavaFX 2.0 */ public class PerspectiveCamera extends Camera { private boolean fixedEyeAtCameraZero = false; // Lookat transform for legacy case private static final Affine3D LOOK_AT_TX = new Affine3D(); // Lookat transform for fixedEyeAtCameraZero case private static final Affine3D LOOK_AT_TX_FIXED_EYE = new Affine3D(); static { // Compute the legacy look at matrix such that the zero point ends up at // the z=-1 plane. LOOK_AT_TX.setToTranslation(0, 0, -1); // Y-axis pointing down LOOK_AT_TX.rotate(Math.PI, 1, 0, 0); // Compute the fixed eye at (0, 0, 0) look at matrix such that the zero point // ends up at the z=0 plane and Y-axis pointing down LOOK_AT_TX_FIXED_EYE.rotate(Math.PI, 1, 0, 0); } /** * Specifies the field of view angle of the camera's projection plane, * measured in degrees. * * @defaultValue 30.0 */ private DoubleProperty fieldOfView; public final void setFieldOfView(double value){ fieldOfViewProperty().set(value); } public final double getFieldOfView() { return fieldOfView == null ? 30 : fieldOfView.get(); } public final DoubleProperty fieldOfViewProperty() { if (fieldOfView == null) { fieldOfView = new SimpleDoubleProperty(PerspectiveCamera.this, "fieldOfView", 30) { @Override protected void invalidated() { impl_markDirty(DirtyBits.NODE_CAMERA); } }; } return fieldOfView; } /** * Defines whether the {@code fieldOfView} property is to apply to the vertical * dimension of the projection plane. If it is false, {@code fieldOfView} is to * apply to the horizontal dimension of the projection plane. * * @defaultValue true * @since JavaFX 8.0 */ private BooleanProperty verticalFieldOfView; public final void setVerticalFieldOfView(boolean value) { verticalFieldOfViewProperty().set(value); } public final boolean isVerticalFieldOfView() { return verticalFieldOfView == null ? true : verticalFieldOfView.get(); } public final BooleanProperty verticalFieldOfViewProperty() { if (verticalFieldOfView == null) { verticalFieldOfView = new SimpleBooleanProperty(PerspectiveCamera.this, "verticalFieldOfView", true) { @Override protected void invalidated() { impl_markDirty(DirtyBits.NODE_CAMERA); } }; } return verticalFieldOfView; } public PerspectiveCamera() { this(false); } /** * Constructs a PerspectiveCamera with the specified fixedEyeAtCameraZero flag. * *

In the default camera, where fixedEyeAtCameraZero is false, the Z value of * the eye position is adjusted in Z such that the projection matrix generated * using the specified {@code fieldOfView} will produce units at * Z = 0 (the projection plane), in device-independent pixels, matches that of * the ParallelCamera. * When the Scene is resized, * the objects in the scene at the projection plane (Z = 0) will stay the same size, * but more or less content of the scene is viewable. * *

If fixedEyeAtCameraZero is true, the eye position is fixed at (0, 0, 0) * in the local coordinates of the camera. The projection matrix is generated * using the specified {@code fieldOfView} and the projection volume is mapped * onto the viewport (window) such that it is stretched over more or fewer * device-independent pixels at the projection plane. * When the Scene is resized, * the objects in the scene will shrink or grow proportionally, * but the visible portion of the content is unchanged. * *

We recommend setting fixedEyeAtCameraZero to true if you are going to * transform (move) the camera. Transforming the camera when fixedEyeAtCameraZero * is set to false may lead to results that are not intuitive. * * @since JavaFX 8.0 */ public PerspectiveCamera(boolean fixedEyeAtCameraZero) { if (!Platform.isSupported(ConditionalFeature.SCENE3D)) { String logname = PerspectiveCamera.class.getName(); PlatformLogger.getLogger(logname).warning("System can't support " + "ConditionalFeature.SCENE3D"); } this.fixedEyeAtCameraZero = fixedEyeAtCameraZero; } public final boolean isFixedEyeAtCameraZero() { return fixedEyeAtCameraZero; } @Override final PickRay computePickRay(double x, double y, PickRay pickRay) { return PickRay.computePerspectivePickRay(x, y, fixedEyeAtCameraZero, getViewWidth(), getViewHeight(), getFieldOfView(), isVerticalFieldOfView(), getCameraTransform(), //TODO: use actual clips always after rendering uses them fixedEyeAtCameraZero ? getNearClip() : 0.0, fixedEyeAtCameraZero ? getFarClip() : Double.POSITIVE_INFINITY, pickRay); } @Override Camera copy() { PerspectiveCamera c = new PerspectiveCamera(fixedEyeAtCameraZero); c.setNearClip(getNearClip()); c.setFarClip(getFarClip()); c.setFieldOfView(getFieldOfView()); return c; } /** * @treatAsPrivate implementation detail * @deprecated This is an internal API that is not intended for use and will be removed in the next version */ @Deprecated @Override protected PGNode impl_createPGNode() { PGPerspectiveCamera pgCamera = Toolkit.getToolkit().createPGPerspectiveCamera(fixedEyeAtCameraZero); pgCamera.setNearClip((float) getNearClip()); pgCamera.setFarClip((float) getFarClip()); pgCamera.setFieldOfView((float) getFieldOfView()); return pgCamera; } /** * @treatAsPrivate implementation detail * @deprecated This is an internal API that is not intended for use and will be removed in the next version */ @Deprecated @Override public void impl_updatePG() { super.impl_updatePG(); PGPerspectiveCamera pgPerspectiveCamera = (PGPerspectiveCamera)impl_getPGNode(); if (impl_isDirty(DirtyBits.NODE_CAMERA)) { pgPerspectiveCamera.setVerticalFieldOfView(isVerticalFieldOfView()); pgPerspectiveCamera.setFieldOfView((float) getFieldOfView()); } } @Override void computeProjectionTransform(GeneralTransform3D proj) { proj.perspective(isVerticalFieldOfView(), Math.toRadians(getFieldOfView()), getViewWidth() / getViewHeight(), getNearClip(), getFarClip()); } @Override void computeViewTransform(Affine3D view) { // In the case of fixedEyeAtCameraZero the camera position is (0,0,0) in // local coord. of the camera node. In non-fixed eye case, the camera // position is (w/2, h/2, h/2/tan) in local coord. of the camera. if (isFixedEyeAtCameraZero()) { view.setTransform(LOOK_AT_TX_FIXED_EYE); } else { final double viewWidth = getViewWidth(); final double viewHeight = getViewHeight(); final boolean verticalFOV = isVerticalFieldOfView(); final double aspect = viewWidth / viewHeight; final double tanOfHalfFOV = Math.tan(Math.toRadians(getFieldOfView()) / 2.0); // Translate the zero point to the upper-left corner final double xOffset = -tanOfHalfFOV * (verticalFOV ? aspect : 1.0); final double yOffset = tanOfHalfFOV * (verticalFOV ? 1.0 : 1.0 / aspect); // Compute scale factor as 2/viewport.width or height, after adjusting for fov final double scale = 2.0 * tanOfHalfFOV / (verticalFOV ? viewHeight : viewWidth); view.setToTranslation(xOffset, yOffset, 0.0); view.concatenate(LOOK_AT_TX); view.scale(scale, scale, scale); } } @Override Vec3d computePosition(Vec3d position) { if (position == null) { position = new Vec3d(); } if (fixedEyeAtCameraZero) { position.set(0.0, 0.0, 0.0); } else { final double halfViewWidth = getViewWidth() / 2.0; final double halfViewHeight = getViewHeight() / 2.0; final double halfViewDim = isVerticalFieldOfView() ? halfViewHeight : halfViewWidth; final double distanceZ = halfViewDim / Math.tan(Math.toRadians(getFieldOfView() / 2.0)); position.set(halfViewWidth, halfViewHeight, -distanceZ); } return position; } }





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