var config = { width: 800, height: 600, type: Phaser.AUTO, parent: 'phaser-example', scene: { create: create, update: update } }; var game = new Phaser.Game(config); var graphics; var point; var point2; var text; var angle = 0; function create () { graphics = this.add.graphics({ lineStyle: { width: 2, color: 0x2266aa } }); point = new Phaser.Math.Vector2(250, 0); point2 = new Phaser.Math.Vector2(250, 0); text = this.add.text(30, 30, ''); this.input.on('pointermove', function (pointer) { point2.copy(pointer); point2.x -= 400; point2.y -= 300; }); } function update () { graphics.clear(); angle += 0.005; // vector starting at 0/0 point.setTo(Math.cos(angle) * 250, Math.sin(angle) * 250); // drawn from the center (as if center was 0/0) graphics.lineBetween(400, 300, 400 + point.x, 300 + point.y); graphics.lineStyle(2, 0x00aa00); graphics.lineBetween(400, 300, 400 + point2.x, 300 + point2.y); var cross = point.cross(point2); var area = point.length() * point2.length(); var angleBetween = Math.asin(cross / area); text.setText([ 'Cross product: ' + cross, 'Normalized cross product: ' + cross / area, 'Sinus of the angle between vectors: '+ Phaser.Math.RadToDeg(angleBetween), 'Green vector is on the ' + (cross > 0 ? 'right' : 'left') ].join('\n')); }
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var config = { width: 800, height: 600, type: Phaser.AUTO, parent: 'phaser-example', scene: { create: create, update: update } }; var game = new Phaser.Game(config); var graphics; var point; var point2; var text; var angle = 0; function create () { graphics = this.add.graphics({ lineStyle: { width: 2, color: 0x2266aa } }); point = new Phaser.Math.Vector2(250, 0); point2 = new Phaser.Math.Vector2(250, 0); text = this.add.text(30, 30, ''); this.input.on('pointermove', function (pointer) { point2.copy(pointer); point2.x -= 400; point2.y -= 300; }); } function update () { graphics.clear(); angle += 0.005; // vector starting at 0/0 point.setTo(Math.cos(angle) * 250, Math.sin(angle) * 250); // drawn from the center (as if center was 0/0) graphics.lineBetween(400, 300, 400 + point.x, 300 + point.y); graphics.lineStyle(2, 0x00aa00); graphics.lineBetween(400, 300, 400 + point2.x, 300 + point2.y); var cross = point.cross(point2); var area = point.length() * point2.length(); var angleBetween = Math.asin(cross / area); text.setText([ 'Cross product: ' + cross, 'Normalized cross product: ' + cross / area, 'Sinus of the angle between vectors: '+ Phaser.Math.RadToDeg(angleBetween), 'Green vector is on the ' + (cross > 0 ? 'right' : 'left') ].join('\n')); }