planck-js/example/PolyCollision.js

2D JavaScript physics engine for cross-platform HTML5 game development

/*
 * MIT License
 * Copyright (c) 2019 Erin Catto
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

planck.testbed('PolyCollision', function(testbed) {
  var pl = planck, Vec2 = pl.Vec2, Transform = pl.Transform;
  var world = new pl.World(Vec2(0, -10));

  var polygonA = pl.Box(2, 4);
  var transformA = pl.Transform(Vec2(0.0, 0.0), 0.0);

  var polygonB = pl.Box(5, 5);
  var positionB = Vec2(5, 4);
  var angleB = 1.9160721;
  var transformB = pl.Transform(positionB, angleB);

  testbed.step = function() {
    var manifold = new pl.internal.Manifold();
    pl.internal.CollidePolygons(manifold, polygonA, transformA, polygonB, transformB);

    var worldManifold = manifold.getWorldManifold(null, transformA, polygonA.getRadius(), transformB, polygonB.getRadius());

    testbed.status('point count', manifold.pointCount);

    var vA = polygonA.m_vertices.map(Transform.mulFn(transformA));
    testbed.drawPolygon(vA, testbed.color(0.9, 0.9, 0.9));

    var vB = polygonB.m_vertices.map(Transform.mulFn(transformB));
    testbed.drawPolygon(vB, testbed.color(0.9, 0.9, 0.9));

    for (var i = 0; i < manifold.pointCount; ++i) {
      testbed.drawPoint(worldManifold.points[i], 4.0, testbed.color(0.9, 0.3, 0.3));
    }
  };

  testbed.keydown = function() {
    if (testbed.activeKeys['left']) {
      positionB.x -= 0.2;
    }

    if (testbed.activeKeys['right']) {
      positionB.x += 0.2;
    }

    if (testbed.activeKeys['down']) {
      positionB.y -= 0.2;
    }

    if (testbed.activeKeys['up']) {
      positionB.y += 0.2;
    }

    if (testbed.activeKeys['Z']) {
      angleB += 0.2;
    }

    if (testbed.activeKeys['X']) {
      angleB -= 0.2;
    }

    transformB.set(positionB, angleB);
  };

  testbed.info('Use arrow keys to move and Z or X to rotate.')
  return world;
});