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added Body.setPosition, Body.setAngle, Body.setVelocity, Body.setAngularVelocity
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liabru
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1 changed files with 107 additions and 57 deletions
164
src/body/Body.js
164
src/body/Body.js
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@ -177,6 +177,113 @@ var Body = {};
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Vertices.translate(body.vertices, body.position);
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Vertices.translate(body.vertices, body.position);
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Bounds.update(body.bounds, body.vertices, body.velocity);
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Bounds.update(body.bounds, body.vertices, body.velocity);
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};
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};
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/**
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* Sets the position of the body instantly. Velocity, angle, force etc. are unchanged.
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* @method setPosition
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* @param {body} body
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* @param {vector} position
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*/
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Body.setPosition = function(body, position) {
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var delta = Vector.sub(position, body.position);
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body.position.x = position.x;
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body.position.y = position.y;
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body.positionPrev.x += delta.x;
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body.positionPrev.y += delta.y;
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Vertices.translate(body.vertices, delta);
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Bounds.update(body.bounds, body.vertices, body.velocity);
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};
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/**
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* Sets the angle of the body instantly. Angular velocity, position, force etc. are unchanged.
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* @method setAngle
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* @param {body} body
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* @param {number} angle
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*/
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Body.setAngle = function(body, angle) {
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var delta = angle - body.angle;
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body.angle = angle;
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body.anglePrev += delta;
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Vertices.rotate(body.vertices, delta, body.position);
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Axes.rotate(body.axes, delta);
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Bounds.update(body.bounds, body.vertices, body.velocity);
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};
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/**
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* Sets the linear velocity of the body instantly. Position, angle, force etc. are unchanged. See also `Body.applyForce`.
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* @method setVelocity
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* @param {body} body
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* @param {vector} velocity
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*/
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Body.setVelocity = function(body, velocity) {
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body.positionPrev.x = body.position.x - velocity.x;
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body.positionPrev.y = body.position.y - velocity.y;
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body.velocity.x = velocity.x;
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body.velocity.y = velocity.y;
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body.speed = Vector.magnitude(body.velocity);
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};
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/**
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* Sets the angular velocity of the body instantly. Position, angle, force etc. are unchanged. See also `Body.applyForce`.
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* @method setAngularVelocity
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* @param {body} body
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* @param {number} velocity
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*/
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Body.setAngularVelocity = function(body, velocity) {
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body.anglePrev = body.angle - velocity;
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body.angularVelocity = velocity;
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body.angularSpeed = Math.abs(body.angularVelocity);
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};
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/**
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* Moves a body by a given vector relative to its current position, without imparting any velocity.
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* @method translate
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* @param {body} body
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* @param {vector} translation
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*/
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Body.translate = function(body, translation) {
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Body.setPosition(body, Vector.add(body.position, translation));
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};
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/**
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* Rotates a body by a given angle relative to its current angle, without imparting any angular velocity.
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* @method rotate
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* @param {body} body
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* @param {number} rotation
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*/
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Body.rotate = function(body, rotation) {
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Body.setAngle(body, body.angle + angle);
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};
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/**
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* Scales the body, including updating physical properties (mass, area, axes, inertia), from a world-space point (default is body centre).
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* @method scale
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* @param {body} body
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* @param {number} scaleX
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* @param {number} scaleY
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* @param {vector} [point]
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*/
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Body.scale = function(body, scaleX, scaleY, point) {
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// scale vertices
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Vertices.scale(body.vertices, scaleX, scaleY, point);
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// update properties
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body.axes = Axes.fromVertices(body.vertices);
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body.area = Vertices.area(body.vertices);
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body.mass = body.density * body.area;
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body.inverseMass = 1 / body.mass;
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// update inertia (requires vertices to be at origin)
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Vertices.translate(body.vertices, { x: -body.position.x, y: -body.position.y });
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body.inertia = Vertices.inertia(body.vertices, body.mass);
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body.inverseInertia = 1 / body.inertia;
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Vertices.translate(body.vertices, { x: body.position.x, y: body.position.y });
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// update bounds
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Bounds.update(body.bounds, body.vertices, body.velocity);
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Bounds.update(body.bounds, body.vertices, body.velocity);
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};
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};
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@ -300,63 +407,6 @@ var Body = {};
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body.torque += (offset.x * force.y - offset.y * force.x) * body.inverseInertia;
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body.torque += (offset.x * force.y - offset.y * force.x) * body.inverseInertia;
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};
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};
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/**
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* Moves a body by a given vector relative to its current position, without imparting any velocity.
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* @method translate
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* @param {body} body
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* @param {vector} translation
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*/
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Body.translate = function(body, translation) {
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body.positionPrev.x += translation.x;
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body.positionPrev.y += translation.y;
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body.position.x += translation.x;
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body.position.y += translation.y;
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Vertices.translate(body.vertices, translation);
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Bounds.update(body.bounds, body.vertices, body.velocity);
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};
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/**
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* Rotates a body by a given angle relative to its current angle, without imparting any angular velocity.
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* @method rotate
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* @param {body} body
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* @param {number} angle
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*/
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Body.rotate = function(body, angle) {
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body.anglePrev += angle;
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body.angle += angle;
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Vertices.rotate(body.vertices, angle, body.position);
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Axes.rotate(body.axes, angle);
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Bounds.update(body.bounds, body.vertices, body.velocity);
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};
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/**
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* Scales the body, including updating physical properties (mass, area, axes, inertia), from a world-space point (default is body centre).
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* @method scale
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* @param {body} body
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* @param {number} scaleX
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* @param {number} scaleY
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* @param {vector} [point]
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*/
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Body.scale = function(body, scaleX, scaleY, point) {
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// scale vertices
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Vertices.scale(body.vertices, scaleX, scaleY, point);
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// update properties
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body.axes = Axes.fromVertices(body.vertices);
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body.area = Vertices.area(body.vertices);
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body.mass = body.density * body.area;
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body.inverseMass = 1 / body.mass;
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// update inertia (requires vertices to be at origin)
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Vertices.translate(body.vertices, { x: -body.position.x, y: -body.position.y });
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body.inertia = Vertices.inertia(body.vertices, body.mass);
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body.inverseInertia = 1 / body.inertia;
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Vertices.translate(body.vertices, { x: body.position.x, y: body.position.y });
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// update bounds
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Bounds.update(body.bounds, body.vertices, body.velocity);
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};
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/*
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/*
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*
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*
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* Properties Documentation
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* Properties Documentation
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