android:模擬水波效果的自定義View

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1.先看效果

2.再看關鍵代碼

描繪函數y = Asin(wx+d)+offset

/**
	 * 使用路徑描繪繪制的區域
	 * 
	 * @return
	 */
	private Path getFristWavePath() {
		// 繪制區域1的路徑
		if (firstWavePath == null) {
			firstWavePath = new Path();
		}
		firstWavePath.reset();
		firstWavePath.moveTo(0, height);// 移動到左下角的點
		for (float x = 0; x <= width; x += X_STEP) {
			float y = (float) (waveHeight * Math.sin(omega * x + moveWave) + waveHeight)
					+ heightOffset;
			firstWavePath.lineTo(x, y);
		}
		firstWavePath.lineTo(width, 0);
		firstWavePath.lineTo(width, height);
		return firstWavePath;
	}