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rotate based on initial mouse-position and initial entity rotation rather than doing small deltas as the mouse moves

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This commit is contained in:
Seth Alves 2015-06-09 14:26:44 -07:00
parent 23dab530f9
commit 6cce845984
1 changed files with 14 additions and 10 deletions
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24
examples/grab.js
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@ -53,6 +53,7 @@ var gTargetRotation;
var gLiftKey = false; // SHIFT
var gRotateKey = false; // CONTROL
var gInitialMouse = { x: 0, y: 0 };
var gPreviousMouse = { x: 0, y: 0 };
var gMouseCursorLocation = { x: 0, y: 0 };
var gMouseAtRotateStart = { x: 0, y: 0 };
@ -173,6 +174,7 @@ function mousePressEvent(event) {
if (!event.isLeftButton) {
return;
}
gInitialMouse = {x: event.x, y: event.y };
gPreviousMouse = {x: event.x, y: event.y };
var pickRay = Camera.computePickRay(event.x, event.y);
@ -189,12 +191,13 @@ function mousePressEvent(event) {
var clickedEntity = pickResults.entityID;
var entityProperties = Entities.getEntityProperties(clickedEntity)
var objectPosition = entityProperties.position;
gStartPosition = entityProperties.position;
gStartRotation = entityProperties.rotation;
var cameraPosition = Camera.getPosition();
gBeaconHeight = Vec3.length(entityProperties.dimensions);
gMaxGrabDistance = gBeaconHeight / MAX_SOLID_ANGLE;
if (Vec3.distance(objectPosition, cameraPosition) > gMaxGrabDistance) {
if (Vec3.distance(gStartPosition, cameraPosition) > gMaxGrabDistance) {
// don't allow grabs of things far away
return;
}
@ -205,20 +208,20 @@ function mousePressEvent(event) {
gGrabbedEntity = clickedEntity;
gCurrentPosition = entityProperties.position;
gOriginalGravity = entityProperties.gravity;
gTargetPosition = objectPosition;
gTargetPosition = gStartPosition;
// compute the grab point
var nearestPoint = Vec3.subtract(objectPosition, cameraPosition);
var nearestPoint = Vec3.subtract(gStartPosition, cameraPosition);
var distanceToGrab = Vec3.dot(nearestPoint, pickRay.direction);
nearestPoint = Vec3.multiply(distanceToGrab, pickRay.direction);
gPointOnPlane = Vec3.sum(cameraPosition, nearestPoint);
// compute the grab offset
gGrabOffset = Vec3.subtract(objectPosition, gPointOnPlane);
gGrabOffset = Vec3.subtract(gStartPosition, gPointOnPlane);
computeNewGrabPlane();
updateDropLine(objectPosition);
updateDropLine(gStartPosition);
// TODO: play sounds again when we aren't leaking AudioInjector threads
//Audio.playSound(grabSound, { position: entityProperties.position, volume: VOLUME });
@ -256,17 +259,18 @@ function mouseMoveEvent(event) {
if (gGrabMode === "rotate") {
var deltaMouse = { x: 0, y: 0 };
var dx = event.x - gPreviousMouse.x;
var dy = event.y - gPreviousMouse.y;
var dx = event.x - gInitialMouse.x;
var dy = event.y - gInitialMouse.y;
var orientation = Camera.getOrientation();
var dragOffset = Vec3.multiply(dx, Quat.getRight(orientation));
dragOffset = Vec3.sum(dragOffset, Vec3.multiply(-dy, Quat.getUp(orientation)));
var axis = Vec3.cross(dragOffset, Quat.getFront(orientation));
axis = Vec3.normalize(axis);
var ROTATE_STRENGTH = 16.0; // magic number tuned by hand
var ROTATE_STRENGTH = 0.4; // magic number tuned by hand
var angle = ROTATE_STRENGTH * Math.sqrt((dx * dx) + (dy * dy));
var deltaQ = Quat.angleAxis(angle, axis);
var qZero = entityProperties.rotation;
// var qZero = entityProperties.rotation;
var qZero = gStartRotation;
var qOne = Quat.multiply(deltaQ, qZero);
actionArgs = {targetRotation: qOne, angularTimeScale: 0.1};
} else {