Home Database Mysql Tutorial cocos2dx射箭等抛射物的简单解决方案

cocos2dx射箭等抛射物的简单解决方案

Jun 07, 2016 pm 03:15 PM
Simple solution

也是从网上看来的,这里记录一下 原理是利用贝塞尔曲线弓箭的旋转来造成弓箭的抛物线效果。 贝赛尔曲线: ccBezierConfig bezier;bezier.controlPoint_1 = start;bezier.controlPoint_2 = ccp(start.x+(end.x-start.x)*0.5,start.y+(end.y-start.y)*0.5+100)

也是从网上看来的,这里记录一下

原理是利用贝塞尔曲线+弓箭的旋转来造成弓箭的抛物线效果。

贝赛尔曲线:

	ccBezierConfig bezier;
	bezier.controlPoint_1 = start;
	bezier.controlPoint_2 = ccp(start.x+(end.x-start.x)*0.5,start.y+(end.y-start.y)*0.5+100);
	bezier.endPosition = ccp(end.x, end.y);
	float duration = 1.0f;
	CCBezierTo *actionBezier = CCBezierTo::create(duration,bezier);
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其中controlPoint_1是起始点,endPosition是贝塞尔曲线动画的结束点,最重要的controlPoint_2是曲线的走向,决定了曲线的最高点。想深入学习贝塞尔曲线的同学请看这里:http://www.jasondavies.com/animated-bezier/

然后是旋转动画:

	float angle = <span style="font-family: Arial, Helvetica, sans-serif;">45.0f</span><span style="font-family: Arial, Helvetica, sans-serif;">;</span>
	CCRotateTo *actionRotate =CCRotateTo::create(duration,angle);
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最后让两个动画同时播放:
	CCSpawn* actionSpawn = CCSpawn::createWithTwoActions(actionBezier,actionRotate);

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好了,大功告成。

但是这样做了之后,感觉射箭效果仍然不理想,毕竟是投机取巧的方法。为了优化视觉效果,可以调整动画播放的速度。




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