Provide a way to zoom the camera in and out programmatically, added keys
to roll the camera forward and back. git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3540 542714f4-19e9-0310-aa3c-eee0fc999fb1
This commit is contained in:
Michael Bayne
@@ -17,6 +17,7 @@ import com.jme.input.action.*;
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import com.jme.input.action.InputActionEvent;
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import com.threerings.jme.JmeApp;
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import com.threerings.jme.Log;
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/**
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* Sets up camera controls for moving around from a top-down perspective,
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@@ -34,11 +35,43 @@ public class GodViewHandler extends InputHandler
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*/
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public GodViewHandler (JmeApp app, Camera cam, String api)
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{
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_camera = cam;
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setKeyBindings(api);
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setMouse(cam);
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setActions(cam, app);
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}
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/**
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* Configures the minimum and maximum z-axis elevation allowed for the
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* camera.
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*/
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public void setZoomLimits (float minZ, float maxZ)
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{
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_minZ = minZ;
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_maxZ = maxZ;
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}
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/**
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* Sets the camera zoom level to a value between zero (zoomed in
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* maximally) and 1 (zoomed out maximally). Zoom limits must have
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* already been set up via a call to {@link #setZoomLimits}.
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*/
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public void setZoomLevel (float level)
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{
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Log.info("Zoom " + level + " " + _camera.getLocation());
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level = Math.max(0f, Math.min(level, 1f));
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_camera.getLocation().z = _minZ + (_maxZ - _minZ) * level;
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_camera.update();
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}
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/**
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* Returns the current camera zoom level.
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*/
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public float getZoomLevel ()
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{
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return (_camera.getLocation().z - _minZ) / (_maxZ - _minZ);
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}
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protected void setKeyBindings (String api)
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{
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KeyBindingManager keyboard = KeyBindingManager.getKeyBindingManager();
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@@ -53,6 +86,8 @@ public class GodViewHandler extends InputHandler
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keyboard.set("zoomOut", KeyInput.KEY_DOWN);
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keyboard.set("turnRight", KeyInput.KEY_RIGHT);
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keyboard.set("turnLeft", KeyInput.KEY_LEFT);
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keyboard.set("rollForward", KeyInput.KEY_HOME);
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keyboard.set("rollBack", KeyInput.KEY_END);
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keyboard.set("screenshot", KeyInput.KEY_F12);
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keyboard.set("exit", KeyInput.KEY_ESCAPE);
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@@ -111,7 +146,7 @@ public class GodViewHandler extends InputHandler
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CameraAction left = new CameraAction(cam, 0.5f) {
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public void performAction (InputActionEvent evt) {
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Vector3f loc = _camera.getLocation();
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loc.addLocal(_rxdir.mult(speed * evt.getTime(), _temp));
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loc.subtractLocal(_rxdir.mult(speed * evt.getTime(), _temp));
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_camera.setLocation(loc);
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_camera.update();
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}
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@@ -122,7 +157,7 @@ public class GodViewHandler extends InputHandler
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CameraAction right = new CameraAction(cam, 0.5f) {
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public void performAction (InputActionEvent evt) {
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Vector3f loc = _camera.getLocation();
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loc.subtractLocal(_rxdir.mult(speed * evt.getTime(), _temp));
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loc.addLocal(_rxdir.mult(speed * evt.getTime(), _temp));
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_camera.setLocation(loc);
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_camera.update();
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}
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@@ -130,48 +165,82 @@ public class GodViewHandler extends InputHandler
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right.setKey("right");
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addAction(right);
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KeyForwardAction zoomIn = new KeyForwardAction(cam, 0.5f);
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CameraAction zoomIn = new CameraAction(cam, 0.5f) {
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public void performAction (InputActionEvent evt) {
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Vector3f loc = _camera.getLocation();
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if (loc.z > _minZ) {
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_camera.getDirection().mult(speed * evt.getTime(), _temp);
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loc.addLocal(_temp);
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_camera.setLocation(loc);
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_camera.update();
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}
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}
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};
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zoomIn.setKey("zoomIn");
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addAction(zoomIn);
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KeyBackwardAction zoomOut = new KeyBackwardAction(cam, 0.5f);
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CameraAction zoomOut = new CameraAction(cam, 0.5f) {
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public void performAction (InputActionEvent evt) {
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Vector3f loc = _camera.getLocation();
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if (loc.z < _maxZ) {
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_camera.getDirection().mult(speed * evt.getTime(), _temp);
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loc.subtractLocal(_temp);
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_camera.setLocation(loc);
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_camera.update();
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}
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}
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};
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zoomOut.setKey("zoomOut");
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addAction(zoomOut);
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// CameraAction lookUp = new CameraAction(cam, 0.5f) {
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// public void performAction (InputActionEvent evt) {
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// _incr.fromAxisAngle(_camera.getLeft(),
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// -FastMath.PI * evt.getTime() / 2);
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// _incr.mult(_camera.getLeft(), _camera.getLeft());
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// _incr.mult(_camera.getDirection(), _camera.getDirection());
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// _incr.mult(_camera.getUp(), _camera.getUp());
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// _camera.update();
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// }
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// private Matrix3f _incr = new Matrix3f();
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// };
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// lookUp.setKey("lookUp");
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// addAction(lookUp);
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// CameraAction lookDown = new CameraAction(cam, 0.5f) {
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// public void performAction (InputActionEvent evt) {
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// _incr.fromAxisAngle(_camera.getLeft(),
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// FastMath.PI * evt.getTime() / 2);
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// _incr.mult(_camera.getLeft(), _camera.getLeft());
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// _incr.mult(_camera.getDirection(), _camera.getDirection());
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// _incr.mult(_camera.getUp(), _camera.getUp());
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// _camera.update();
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// }
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// private Matrix3f _incr = new Matrix3f();
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// };
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// lookDown.setKey("lookDown");
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// addAction(lookDown);
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CameraAction orbitRight = new OrbitAction(cam, -FastMath.PI / 2);
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OrbitAction orbitRight = new OrbitAction(-FastMath.PI / 2);
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orbitRight.setKey("turnRight");
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addAction(orbitRight);
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CameraAction orbitLeft = new OrbitAction(cam, FastMath.PI / 2);
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OrbitAction orbitLeft = new OrbitAction(FastMath.PI / 2);
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orbitLeft.setKey("turnLeft");
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addAction(orbitLeft);
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RollAction rollForward = new RollAction(-FastMath.PI / 2);
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rollForward.setKey("rollForward");
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addAction(rollForward);
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RollAction rollBack = new RollAction(FastMath.PI / 2);
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rollBack.setKey("rollBack");
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addAction(rollBack);
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}
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/**
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* Locates the point on the ground at which the camera is "looking"
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* and rotates the camera from that point around the specified vector
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* by the specified angle.
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*/
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protected void rotateCamera (Vector3f around, float deltaAngle)
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{
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// locate the point at which the camera is "pointing" on
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// the ground plane
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Vector3f camloc = _camera.getLocation();
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Vector3f center = groundPoint(_camera);
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// get a vector from the camera's position to the point
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// around which we're going to orbit
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Vector3f direction = camloc.subtract(center);
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// create a rotation matrix
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_rotm.fromAxisAngle(around, deltaAngle);
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// rotate the center to camera vector and the camera itself
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_rotm.mult(direction, direction);
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_rotm.mult(_camera.getUp(), _camera.getUp());
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_rotm.mult(_camera.getLeft(), _camera.getLeft());
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_rotm.mult(_camera.getDirection(), _camera.getDirection());
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_rotm.mult(_rxdir, _rxdir);
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_rotm.mult(_rydir, _rydir);
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// and move the camera to its new location
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_camera.setLocation(center.add(direction));
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_camera.update();
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}
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protected static Vector3f groundPoint (Camera camera)
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@@ -196,48 +265,40 @@ public class GodViewHandler extends InputHandler
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protected Vector3f _temp = new Vector3f();
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}
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protected class OrbitAction extends CameraAction
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protected class OrbitAction extends KeyInputAction
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{
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public OrbitAction (Camera camera, float radPerSec)
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public OrbitAction (float radPerSec)
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{
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super(camera, 0f);
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_radPerSec = radPerSec;
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}
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public void performAction (InputActionEvent evt)
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{
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// locate the point at which the camera is "pointing" on
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// the ground plane
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Vector3f camloc = _camera.getLocation();
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Vector3f center = groundPoint(_camera);
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// get a vector from the camera's position to the point
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// around which we're going to orbit
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Vector3f direction = camloc.subtract(center);
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// compute the amount we wish to orbit
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float deltaA = _radPerSec * evt.getTime();
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// create a rotation matrix
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_rotm.fromAxisAngle(_groundNormal, deltaA);
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// rotate the center to camera vector and the camera itself
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_rotm.mult(direction, direction);
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_rotm.mult(_camera.getUp(), _camera.getUp());
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_rotm.mult(_camera.getLeft(), _camera.getLeft());
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_rotm.mult(_camera.getDirection(), _camera.getDirection());
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_rotm.mult(_rxdir, _rxdir);
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_rotm.mult(_rydir, _rydir);
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// and move the camera to its new location
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_camera.setLocation(center.add(direction));
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_camera.update();
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rotateCamera(_groundNormal, _radPerSec * evt.getTime());
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}
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protected float _radPerSec;
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protected Matrix3f _rotm = new Matrix3f();
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}
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protected class RollAction extends KeyInputAction
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{
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public RollAction (float radPerSec)
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{
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_radPerSec = radPerSec;
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}
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public void performAction (InputActionEvent evt)
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{
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rotateCamera(_camera.getLeft(), _radPerSec * evt.getTime());
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}
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protected float _radPerSec;
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}
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protected Camera _camera;
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protected Matrix3f _rotm = new Matrix3f();
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protected float _minZ = Float.MIN_VALUE, _maxZ = Float.MAX_VALUE;
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protected static final Vector3f _xdir = new Vector3f(1, 0, 0);
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protected static final Vector3f _ydir = new Vector3f(0, 1, 0);
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