射箭游戏

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html

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.19.1/TweenMax.min.js"></script>
<script src="http://jq22.qiniudn.com/MorphSVGPlugin.min.js"></script>
<svg id="game" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 400" overflow="visible">
	
    <path id="arc" fill="none" stroke="url(#ArcGradient)" stroke-width="4" d="M100,250c250-400,550-400,800,0" opacity="0" pointer-events="none"/>
    <defs>
        <g id="arrow">
            <line x2="60" fill="none" stroke="#888" stroke-width="2" />
            <polygon fill="#888" points="64 0 58 2 56 0 58 -2" />
            <polygon fill="#88ce02" points="2 -3 -4 -3 -1 0 -4 3 2 3 5 0" />
        </g>
    </defs>
    <g id="target">
        <path fill="#FFF" d="M924.2,274.2c-21.5,21.5-45.9,19.9-52,3.2c-4.4-12.1,2.4-29.2,14.2-41c11.8-11.8,29-18.6,41-14.2 C944.1,228.3,945.7,252.8,924.2,274.2z" />
        <path fill="#F4531C" d="M915.8,265.8c-14.1,14.1-30.8,14.6-36,4.1c-4.1-8.3,0.5-21.3,9.7-30.5s22.2-13.8,30.5-9.7 C930.4,235,929.9,251.7,915.8,265.8z" />
        <path fill="#FFF" d="M908.9,258.9c-8,8-17.9,9.2-21.6,3.5c-3.2-4.9-0.5-13.4,5.6-19.5c6.1-6.1,14.6-8.8,19.5-5.6 C918.1,241,916.9,250.9,908.9,258.9z" />
        <path fill="#F4531C" d="M903.2,253.2c-2.9,2.9-6.7,3.6-8.3,1.7c-1.5-1.8-0.6-5.4,2-8c2.6-2.6,6.2-3.6,8-2 C906.8,246.5,906.1,250.2,903.2,253.2z" />
    </g>
		<g id="bow" fill="none" stroke-linecap="round" vector-effect="non-scaling-stroke" pointer-events="none">
			<polyline fill="none" stroke="#ddd" stroke-linecap="round" points="88,200 88,250 88,300"/>
			<path fill="none" stroke="#88ce02" stroke-width="3" stroke-linecap="round" d="M88,300 c0-10.1,12-25.1,12-50s-12-39.9-12-50"/>
    </g>
	<g class="arrow-angle"><use x="100" y="250" xlink:href="#arrow"/></g>
	<linearGradient id="ArcGradient" >
			<stop offset="0"  stop-color="#fff" stop-opacity=".2"/>
			<stop offset="80%" stop-color="#fff" stop-opacity="0"/>
	</linearGradient>
	<clipPath id="mask">
		<polygon opacity=".5" points="0,0 1500,0 1500,200 970,290 950,240 925,220 875,280 890,295 920,310 0,350" pointer-events="none"/>
	</clipPath>
	<g class="arrows" clip-path="url(#mask)"  pointer-events="none">
	</g>
	<g class="bullseye" fill="#F4531C" opacity="0">
		<path d="M322,159l15-21l-27-13l-32,13l15,71l41-14l7-32L322,159z M292,142h20l3,8l-16,8 L292,142z M321,182l-18,9l-4-18l23-2V182z"/>
		<path d="M340 131L359 125 362 169 381 167 386 123 405 129 392 183 351 186z"/>
		<path d="M413 119L402 188 450 196 454 175 422 175 438 120z"/>
		<path d="M432 167L454 169 466 154 451 151 478 115 453 113z"/>
		<path d="M524 109L492 112 466 148 487 155 491 172 464 167 463 184 502 191 513 143 487 141 496 125 517 126z"/>
		<path d="M537 114L512 189 558 199 566 174 533 175 539 162 553 164 558 150 543 145 547 134 566 148 575 124z"/>
		<path d="M577 118L587 158 570 198 587 204 626 118 606 118 598 141 590 112z"/>
		<path d="M635 122L599 198 643 207 649 188 624 188 630 170 639 178 645 162 637 158 649 143 662 151 670 134z"/>
		<path d="M649,220l4-21l28,4l-6,25L649,220z M681,191l40-79l-35-8L659,184L681,191z"/>
	</g>
	<g class="hit" fill="#ffcc00" opacity="0">
	 <path d="M383 114L385 195 407 191 406 160 422 155 418 191 436 189 444 112 423 119 422 141 407 146 400 113"/>
  <path d="M449 185L453 113 477 112 464 186"/>
  <path d="M486 113L484 130 506 130 481 188 506 187 520 131 540 135 545 119"/>
  <path d="M526,195l5-20l22,5l-9,16L526,195z M558,164l32-44l-35-9l-19,51L558,164z"/>
</g>
</svg>

<span>Draw back an arrow and launch it!</span>

css

JavaScript

var svg = document.querySelector("svg");
var cursor = svg.createSVGPoint();
var arrows = document.querySelector(".arrows");
var target={x:902,y:247};
var line={x1:875,y1:280,x2:925,y2:220};
window.addEventListener("mousedown", knock);

function knock(e) {
	TweenMax.to(".arrow-angle use", 0.3, {
		opacity: 1
	});
	window.addEventListener("mousemove", aim);
	window.addEventListener("mouseup", loose);
	aim(e);

TweenMax.to("#arc", 0.3, {
		opacity: 1
	});
}

function loose() {
	window.removeEventListener("mousemove", aim);
	window.removeEventListener("mouseup", loose);

TweenMax.to("#bow", 0.4, {
		scaleX: 1,
		transformOrigin: "right center",
		ease: Elastic.easeOut
	});
	TweenMax.to("#bow polyline", 0.4, {
		attr: {
			points: "88,200 88,250 88,300"
		},
		ease: Elastic.easeOut
	});

var newArrow = document.createElementNS("http://www.w3.org/2000/svg", "use");
	newArrow.setAttributeNS('http://www.w3.org/1999/xlink', 'href', "#arrow");
	arrows.appendChild(newArrow);
	var path = MorphSVGPlugin.pathDataToBezier("#arc");
	TweenMax.to([newArrow], 0.5, {
		force3D: true,
		bezier: {
			type: "cubic",
			values: path,
			autoRotate: ["x", "y", "rotation"]
		},
		onUpdate: hitTest,
		onUpdateParams: ["{self}"],
		ease: Linear.easeNone
	});
	TweenMax.to("#arc", 0.3, {
		opacity: 0
	});
	TweenMax.set(".arrow-angle use", {
		opacity: 0
	});
}

function hitTest(tween) {
	var arrow = tween.target[0];
 	var transform = arrow._gsTransform;
 	var radians = transform.rotation * Math.PI / 180;
	var x1 = transform.x;
	var y1 = transform.y;
	var x2 = (Math.cos(radians) * 60) + x1;
	var y2 = (Math.sin(radians) * 60) + y1;
	
	var intersection = getIntersection(x1,y1,x2,y2,line.x1,line.y1,line.x2,line.y2);
	if(intersection=="intersect"){
		 tween.pause();
		var dx = x - target.x;
		var dy = y - target.y;
		var distance = Math.sqrt((dx * dx) + (dy * dy));
		var selector = ".hit";
		if(distance<5){
			selector=".bullseye"
		}
		TweenMax.killTweensOf(selector);
		TweenMax.killChildTweensOf(selector);
		TweenMax.set(selector,{autoAlpha:1});
		TweenMax.staggerFromTo(selector+" path",.5,{rotation:-5,scale:0,transformOrigin:"center"},{scale:1,ease:Back.easeOut},.05);
		TweenMax.staggerTo(selector+" path",.3,{delay:2,rotation:20,scale:0,ease:Back.easeIn},.03);
	}
	
	
	
}

var pivot = {
	x: 100,
	y: 250
};
aim({
	clientX: 100,
	clientY: 400
});

TweenMax.set(".arc", {
	opacity: 0
});

function aim(e) {
	var point = getMouseSVG(e);
	point.x = Math.min(point.x, pivot.x - 7);
	point.y = Math.max(point.y, pivot.y + 7);
	var dx = point.x - pivot.x;
	var dy = point.y - pivot.y;
	var angle = Math.atan2(dy, dx);
	var bowAngle = angle - Math.PI;
	var distance = Math.min(Math.sqrt((dx * dx) + (dy * dy)), 50);
	var scale = Math.min(Math.max(distance / 30, 1), 2);
	TweenMax.to("#bow", 0.3, {
		scaleX: scale,
		rotation: bowAngle + "rad",
		transformOrigin: "right center"
	});
	var arrowX = Math.min(pivot.x - ((1 / scale) * distance), 88);
	TweenMax.to(".arrow-angle", 0.3, {
		rotation: bowAngle + "rad",
		svgOrigin: "100 250"
	});
	TweenMax.to(".arrow-angle use", 0.3, {
		x: -distance
	});
	TweenMax.to("#bow polyline", 0.3, {
		attr: {
			points: "88,200 " + Math.min(pivot.x - ((1 / scale) * distance), 88) + ",250 88,300"
		}
	});

var radius = distance * 9;
	var offset = {
		x: (Math.cos(bowAngle) * radius),
		y: (Math.sin(bowAngle) * radius)
	};
	var arcWidth = offset.x * 3;

TweenMax.to("#arc", 0.3, {
		attr: {
			opacity: 1.4 - (arcWidth / 800),
			d: "M100,250c" + offset.x + "," + offset.y + "," + (arcWidth - offset.x) + "," + (offset.y+50) + "," + arcWidth + ",50"
		}
	});
	
	
	
	
}

function getMouseSVG(e) {
	cursor.x = e.clientX;
	cursor.y = e.clientY;
	return cursor.matrixTransform(svg.getScreenCTM().inverse());
}

function getIntersection(x1, y1, x2, y2, x3, y3, x4, y4) {
    var a1, a2, b1, b2, c1, c2;
    var r1, r2, r3, r4;
    var denom, offset, num;
    a1 = y2 - y1;
    b1 = x1 - x2;
    c1 = (x2 * y1) - (x1 * y2);
    r3 = ((a1 * x3) + (b1 * y3) + c1);
    r4 = ((a1 * x4) + (b1 * y4) + c1);
    if ((r3 != 0) && (r4 != 0) && sameSign(r3, r4)) {
        return "dont intersect";
    }
    a2 = y4 - y3;
    b2 = x3 - x4;
    c2 = (x4 * y3) - (x3 * y4);
    r1 = (a2 * x1) + (b2 * y1) + c2;
    r2 = (a2 * x2) + (b2 * y2) + c2;
    if ((r1 != 0) && (r2 != 0) && (sameSign(r1, r2))) {
        return "dont intersect";
    }
    denom = (a1 * b2) - (a2 * b1);
    if (denom == 0) {
        return "collinear";
    }
    if (denom < 0) {
        offset = -denom / 2;
    } else {
        offset = denom / 2;
    }
    num = (b1 * c2) - (b2 * c1);
    if (num < 0) {
        x = (num - offset) / denom;
    } else {
        x = (num + offset) / denom;
    }
    num = (a2 * c1) - (a1 * c2);
    if (num < 0) {
        y = (num - offset) / denom;
    } else {
        y = (num + offset) / denom;
    }
    return "intersect";
}

function sameSign(a, b) {
    return (a * b) >= 0;
}

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