显示轨迹

原文地址：http://www.phaser.io/examples/v2/arcade-physics/ship-trail。

效果

源代码

window.onload = function () {
    var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser_container', 
                            preload: preload, create: create, update: update ,render:render });

    function preload() {

        game.load.image('chunk', 'images/phaser/chunk.png');
        game.load.image('arrow', 'images/phaser/asteroids_ship.png');

    }

    var sprite;
    var bmd;

    function create() {

        game.physics.startSystem(Phaser.Physics.ARCADE);

        //  点击游戏屏幕的左边或右边，可以控制飞船的发射方向

        game.stage.backgroundColor = '#124184';

        bmd = game.add.bitmapData(800, 600);
        bmd.context.fillStyle = '#ffffff';

        var bg = game.add.sprite(0, 0, bmd);

        game.physics.arcade.gravity.y = 100;

        sprite = game.add.sprite(32, 450, 'arrow');
        sprite.anchor.set(0.5);

        game.physics.enable(sprite, Phaser.Physics.ARCADE);

        sprite.body.collideWorldBounds = true;
        sprite.body.bounce.set(0.8);

        game.input.onDown.add(launch, this);

    }

    function launch() {

        if (game.input.x < sprite.x) {
            sprite.body.velocity.setTo(-200, -200);
        }
        else {
            sprite.body.velocity.setTo(200, -200);
        }

    }

    function update() {

        sprite.rotation = sprite.body.angle;

        bmd.context.fillRect(sprite.x, sprite.y, 2, 2);

        bmd.dirty = true;

    }

    function render() {

        game.debug.bodyInfo(sprite, 32, 32);

    }
}

发布时间：2016/10/11 下午9:40:59  阅读次数：4845