Function createWordBurst

js/script.js:1575–1591

* * @param {string} wordText 文字内容 * @param {Function} particleFactory 每生成一颗星/粒子调用一次。传递参数: * `point `:恒星/粒子的起始位置_相对于canvas。 * `color `:粒子颜色。 * @param {number} center_x 爆炸中心点x * @param {number} center_y 爆炸中心点y

(wordText, particleFactory, center_x, center_y)

 * @param {number} center_y  	爆炸中心点y
 */
function createWordBurst(wordText, particleFactory, center_x, center_y) {
	//将点阵坐标转换为canvas坐标
	var map = getWordDots(wordText);
	if (!map) return;
	var dcenterX = map.width / 2;
	var dcenterY = map.height / 2;
	var color = randomColor();
	var strobed = Math.random() < 0.5;
	var strobeColor = strobed ? randomColor() : color;

	for (let i = 0; i < map.points.length; i++) {
		const point = map.points[i];
		let x = center_x + (point.x - dcenterX);
		let y = center_y + (point.y - dcenterY);
		particleFactory({ x, y }, color, strobed, strobeColor);
	}
}

// Various star effects.
// These are designed to be attached to a star's `onDeath` event.