我正在尝试使用其 HeatMap API 向 Google map 添加一层等高线图，因为等高线图的想法与带有权重的 HeatMap 非常相似。问题是，正如您从图像中看到的那样下面，热图的渲染带有一些光晕效果，即每个像素实际上都有一个蓝色圆圈，我认为这是为了增加与中心颜色的对比度(例如这里的红色)。有没有办法自定义渲染并消除这种光晕效果？据我所知，还没有找到官方文档可以实现这一点。
最佳答案
这是由于该示例中使用的渐变造成的:
来自 the documentation :
gradient | Type: Array The color gradient of the heatmap, specified as an array of CSS color strings. All CSS3 colors are supported except for extended named colors.
设置为:
var gradient = [
'rgba(0, 255, 255, 0)',
'rgba(0, 255, 255, 1)',
'rgba(0, 191, 255, 1)',
'rgba(0, 127, 255, 1)',
'rgba(0, 63, 255, 1)',
'rgba(0, 0, 255, 1)',
'rgba(0, 0, 223, 1)',
'rgba(0, 0, 191, 1)',
'rgba(0, 0, 159, 1)',
'rgba(0, 0, 127, 1)',
'rgba(63, 0, 91, 1)',
'rgba(127, 0, 63, 1)',
'rgba(191, 0, 31, 1)',
'rgba(255, 0, 0, 1)'
]
较小的条目为蓝色。如果您不需要蓝色，请删除蓝色，这只是具有不同不透明度的红色阴影:
var gradient = [
'rgba(255, 0, 0, 0)',
'rgba(255, 0, 0, 0.1)',
'rgba(255, 0, 0, 0.2)',
'rgba(255, 0, 0, 0.3)',
'rgba(255, 0, 0, 0.4)',
'rgba(255, 0, 0, 0.5)',
'rgba(255, 0, 0, 0.6)',
'rgba(255, 0, 0, 0.7)',
'rgba(255, 0, 0, 0.8)',
'rgba(255, 0, 0, 0.9)',
'rgba(255, 0, 0, 1)'
]
代码片段:
// This example requires the Visualization library. Include the libraries=visualization
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=visualization">
var map, heatmap;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 13,
center: {
lat: 37.775,
lng: -122.434
},
mapTypeId: google.maps.MapTypeId.SATELLITE
});
heatmap = new google.maps.visualization.HeatmapLayer({
data: getPoints(),
map: map
});
var gradient = [
'rgba(255, 0, 0, 0)',
'rgba(255, 0, 0, 0.1)',
'rgba(255, 0, 0, 0.2)',
'rgba(255, 0, 0, 0.3)',
'rgba(255, 0, 0, 0.4)',
'rgba(255, 0, 0, 0.5)',
'rgba(255, 0, 0, 0.6)',
'rgba(255, 0, 0, 0.7)',
'rgba(255, 0, 0, 0.8)',
'rgba(255, 0, 0, 0.9)',
'rgba(255, 0, 0, 1)'
]
heatmap.set('gradient', gradient);
}
// Heatmap data: 500 Points
function getPoints() {
return [
new google.maps.LatLng(37.782551, -122.445368),
new google.maps.LatLng(37.782745, -122.444586),
new google.maps.LatLng(37.782842, -122.443688),
new google.maps.LatLng(37.782919, -122.442815),
new google.maps.LatLng(37.782992, -122.442112),
new google.maps.LatLng(37.783100, -122.441461),
new google.maps.LatLng(37.783206, -122.440829),
new google.maps.LatLng(37.783273, -122.440324),
new google.maps.LatLng(37.783316, -122.440023),
new google.maps.LatLng(37.783357, -122.439794),
new google.maps.LatLng(37.783371, -122.439687),
new google.maps.LatLng(37.783368, -122.439666),
new google.maps.LatLng(37.783383, -122.439594),
new google.maps.LatLng(37.783508, -122.439525),
new google.maps.LatLng(37.783842, -122.439591),
new google.maps.LatLng(37.784147, -122.439668),
new google.maps.LatLng(37.784206, -122.439686),
new google.maps.LatLng(37.784386, -122.439790),
new google.maps.LatLng(37.784701, -122.439902),
new google.maps.LatLng(37.784965, -122.439938),
new google.maps.LatLng(37.785010, -122.439947),
new google.maps.LatLng(37.785360, -122.439952),
new google.maps.LatLng(37.785715, -122.440030),
new google.maps.LatLng(37.786117, -122.440119),
new google.maps.LatLng(37.786564, -122.440209),
new google.maps.LatLng(37.786905, -122.440270),
new google.maps.LatLng(37.786956, -122.440279),
new google.maps.LatLng(37.800224, -122.433520),
new google.maps.LatLng(37.800155, -122.434101),
new google.maps.LatLng(37.800160, -122.434430),
new google.maps.LatLng(37.800378, -122.434527),
new google.maps.LatLng(37.800738, -122.434598),
new google.maps.LatLng(37.800938, -122.434650),
new google.maps.LatLng(37.801024, -122.434889),
new google.maps.LatLng(37.800955, -122.435392),
new google.maps.LatLng(37.800886, -122.435959),
new google.maps.LatLng(37.800811, -122.436275),
new google.maps.LatLng(37.800788, -122.436299),
new google.maps.LatLng(37.800719, -122.436302),
new google.maps.LatLng(37.800702, -122.436298),
new google.maps.LatLng(37.800661, -122.436273),
new google.maps.LatLng(37.800395, -122.436172),
new google.maps.LatLng(37.800228, -122.436116),
new google.maps.LatLng(37.800169, -122.436130),
new google.maps.LatLng(37.800066, -122.436167),
new google.maps.LatLng(37.784345, -122.422922),
new google.maps.LatLng(37.784389, -122.422926),
new google.maps.LatLng(37.784437, -122.422924),
new google.maps.LatLng(37.784746, -122.422818),
new google.maps.LatLng(37.785436, -122.422959),
new google.maps.LatLng(37.786120, -122.423112),
new google.maps.LatLng(37.786433, -122.423029),
new google.maps.LatLng(37.786631, -122.421213),
new google.maps.LatLng(37.786660, -122.421033),
new google.maps.LatLng(37.786801, -122.420141),
new google.maps.LatLng(37.786823, -122.420034),
new google.maps.LatLng(37.786831, -122.419916),
new google.maps.LatLng(37.787034, -122.418208),
new google.maps.LatLng(37.787056, -122.418034),
new google.maps.LatLng(37.787169, -122.417145),
new google.maps.LatLng(37.787217, -122.416715),
new google.maps.LatLng(37.786144, -122.416403),
new google.maps.LatLng(37.785292, -122.416257),
new google.maps.LatLng(37.780666, -122.390374),
new google.maps.LatLng(37.780501, -122.391281),
new google.maps.LatLng(37.780148, -122.392052),
new google.maps.LatLng(37.780173, -122.391148),
new google.maps.LatLng(37.780693, -122.390592),
new google.maps.LatLng(37.781261, -122.391142),
new google.maps.LatLng(37.781808, -122.391730),
new google.maps.LatLng(37.782340, -122.392341),
new google.maps.LatLng(37.782812, -122.393022),
new google.maps.LatLng(37.783300, -122.393672),
new google.maps.LatLng(37.783809, -122.394275),
new google.maps.LatLng(37.784246, -122.394979),
new google.maps.LatLng(37.784791, -122.395958),
new google.maps.LatLng(37.785675, -122.396746),
new google.maps.LatLng(37.786262, -122.395780),
new google.maps.LatLng(37.786776, -122.395093),
new google.maps.LatLng(37.787282, -122.394426),
new google.maps.LatLng(37.787783, -122.393767),
new google.maps.LatLng(37.788343, -122.393184),
new google.maps.LatLng(37.788895, -122.392506),
new google.maps.LatLng(37.789371, -122.391701),
new google.maps.LatLng(37.789722, -122.390952),
new google.maps.LatLng(37.790315, -122.390305),
new google.maps.LatLng(37.790738, -122.389616),
new google.maps.LatLng(37.779448, -122.438702),
new google.maps.LatLng(37.779023, -122.438585),
new google.maps.LatLng(37.778542, -122.438492),
new google.maps.LatLng(37.778100, -122.438411),
new google.maps.LatLng(37.777986, -122.438376),
new google.maps.LatLng(37.777680, -122.438313),
new google.maps.LatLng(37.777316, -122.438273),
new google.maps.LatLng(37.777135, -122.438254),
new google.maps.LatLng(37.776987, -122.438303),
new google.maps.LatLng(37.776946, -122.438404),
new google.maps.LatLng(37.776944, -122.438467),
new google.maps.LatLng(37.776892, -122.438459),
new google.maps.LatLng(37.776842, -122.438442),
new google.maps.LatLng(37.776822, -122.438391),
new google.maps.LatLng(37.776814, -122.438412),
new google.maps.LatLng(37.776787, -122.438628),
new google.maps.LatLng(37.776729, -122.438650),
new google.maps.LatLng(37.776759, -122.438677),
new google.maps.LatLng(37.776772, -122.438498),
new google.maps.LatLng(37.776787, -122.438389),
new google.maps.LatLng(37.776848, -122.438283),
new google.maps.LatLng(37.776870, -122.438239),
new google.maps.LatLng(37.777015, -122.438198),
new google.maps.LatLng(37.777333, -122.438256),
new google.maps.LatLng(37.777595, -122.438308),
new google.maps.LatLng(37.777797, -122.438344),
new google.maps.LatLng(37.778160, -122.438442),
new google.maps.LatLng(37.778414, -122.438508),
new google.maps.LatLng(37.778445, -122.438516),
new google.maps.LatLng(37.778503, -122.438529),
new google.maps.LatLng(37.778607, -122.438549),
new google.maps.LatLng(37.778670, -122.438644),
new google.maps.LatLng(37.778847, -122.438706),
new google.maps.LatLng(37.779240, -122.438744),
new google.maps.LatLng(37.779738, -122.438822),
new google.maps.LatLng(37.780201, -122.438882),
new google.maps.LatLng(37.780400, -122.438905),
new google.maps.LatLng(37.780501, -122.438921),
new google.maps.LatLng(37.780892, -122.438986),
new google.maps.LatLng(37.781446, -122.439087),
new google.maps.LatLng(37.781985, -122.439199),
new google.maps.LatLng(37.782239, -122.439249),
new google.maps.LatLng(37.782286, -122.439266),
new google.maps.LatLng(37.797847, -122.429388),
new google.maps.LatLng(37.797874, -122.429180),
new google.maps.LatLng(37.797885, -122.429069),
new google.maps.LatLng(37.797887, -122.429050),
new google.maps.LatLng(37.797933, -122.428954),
new google.maps.LatLng(37.798242, -122.428990),
new google.maps.LatLng(37.798617, -122.429075),
new google.maps.LatLng(37.798719, -122.429092),
new google.maps.LatLng(37.798944, -122.429145),
new google.maps.LatLng(37.799320, -122.429251),
new google.maps.LatLng(37.799590, -122.429309),
new google.maps.LatLng(37.799677, -122.429324),
new google.maps.LatLng(37.799966, -122.429360),
new google.maps.LatLng(37.800288, -122.429430),
new google.maps.LatLng(37.800443, -122.429461),
new google.maps.LatLng(37.800465, -122.429474),
new google.maps.LatLng(37.800644, -122.429540),
new google.maps.LatLng(37.800948, -122.429620),
new google.maps.LatLng(37.801242, -122.429685),
new google.maps.LatLng(37.801375, -122.429702),
new google.maps.LatLng(37.801400, -122.429703),
new google.maps.LatLng(37.801453, -122.429707),
new google.maps.LatLng(37.801473, -122.429709),
new google.maps.LatLng(37.801532, -122.429707),
new google.maps.LatLng(37.801852, -122.429729),
new google.maps.LatLng(37.802173, -122.429789),
new google.maps.LatLng(37.802459, -122.429847),
new google.maps.LatLng(37.802554, -122.429825),
new google.maps.LatLng(37.802647, -122.429549),
new google.maps.LatLng(37.802693, -122.429179),
new google.maps.LatLng(37.802729, -122.428751),
new google.maps.LatLng(37.766104, -122.409291),
new google.maps.LatLng(37.766103, -122.409268),
new google.maps.LatLng(37.766138, -122.409229),
new google.maps.LatLng(37.766183, -122.409231),
new google.maps.LatLng(37.766153, -122.409276),
new google.maps.LatLng(37.766005, -122.409365),
new google.maps.LatLng(37.765897, -122.409570),
new google.maps.LatLng(37.765767, -122.409739),
new google.maps.LatLng(37.765693, -122.410389),
new google.maps.LatLng(37.765615, -122.411201),
new google.maps.LatLng(37.765533, -122.412121),
new google.maps.LatLng(37.765467, -122.412939),
new google.maps.LatLng(37.765444, -122.414821),
new google.maps.LatLng(37.765444, -122.414964),
new google.maps.LatLng(37.765318, -122.415424),
new google.maps.LatLng(37.763961, -122.415296),
new google.maps.LatLng(37.763115, -122.415196),
new google.maps.LatLng(37.762967, -122.415183),
new google.maps.LatLng(37.762278, -122.415127),
new google.maps.LatLng(37.761675, -122.415055),
new google.maps.LatLng(37.760932, -122.414988),
new google.maps.LatLng(37.759337, -122.414862),
new google.maps.LatLng(37.773187, -122.421922),
new google.maps.LatLng(37.773043, -122.422118),
new google.maps.LatLng(37.773007, -122.422165),
new google.maps.LatLng(37.772979, -122.422219),
new google.maps.LatLng(37.772865, -122.422394),
new google.maps.LatLng(37.772779, -122.422503),
new google.maps.LatLng(37.772676, -122.422701),
new google.maps.LatLng(37.772606, -122.422806),
new google.maps.LatLng(37.772566, -122.422840),
new google.maps.LatLng(37.772508, -122.422852),
new google.maps.LatLng(37.772387, -122.423011),
new google.maps.LatLng(37.772099, -122.423328),
new google.maps.LatLng(37.771704, -122.423783),
new google.maps.LatLng(37.771481, -122.424081),
new google.maps.LatLng(37.771400, -122.424179),
new google.maps.LatLng(37.771352, -122.424220),
new google.maps.LatLng(37.771248, -122.424327),
new google.maps.LatLng(37.770904, -122.424781),
new google.maps.LatLng(37.770520, -122.425283),
new google.maps.LatLng(37.770337, -122.425553),
new google.maps.LatLng(37.770128, -122.425832),
new google.maps.LatLng(37.769756, -122.426331),
new google.maps.LatLng(37.769300, -122.426902),
new google.maps.LatLng(37.769132, -122.427065),
new google.maps.LatLng(37.769092, -122.427103),
new google.maps.LatLng(37.768979, -122.427172),
new google.maps.LatLng(37.768595, -122.427634),
new google.maps.LatLng(37.768372, -122.427913),
new google.maps.LatLng(37.768337, -122.427961),
new google.maps.LatLng(37.768244, -122.428138),
new google.maps.LatLng(37.767942, -122.428581),
new google.maps.LatLng(37.767482, -122.429094),
new google.maps.LatLng(37.767031, -122.429606),
new google.maps.LatLng(37.766732, -122.429986),
new google.maps.LatLng(37.766680, -122.430058),
new google.maps.LatLng(37.766633, -122.430109),
new google.maps.LatLng(37.766580, -122.430211),
new google.maps.LatLng(37.766367, -122.430594),
new google.maps.LatLng(37.765910, -122.431137),
new google.maps.LatLng(37.765353, -122.431806),
new google.maps.LatLng(37.764962, -122.432298),
new google.maps.LatLng(37.764868, -122.432486),
new google.maps.LatLng(37.764518, -122.432913),
new google.maps.LatLng(37.763435, -122.434173),
new google.maps.LatLng(37.762847, -122.434953),
new google.maps.LatLng(37.762291, -122.435935),
new google.maps.LatLng(37.762224, -122.436074),
new google.maps.LatLng(37.761957, -122.436892),
new google.maps.LatLng(37.761652, -122.438886),
new google.maps.LatLng(37.761284, -122.439955),
new google.maps.LatLng(37.761210, -122.440068),
new google.maps.LatLng(37.761064, -122.440720),
new google.maps.LatLng(37.761040, -122.441411),
new google.maps.LatLng(37.761048, -122.442324),
new google.maps.LatLng(37.760851, -122.443118),
new google.maps.LatLng(37.759977, -122.444591),
new google.maps.LatLng(37.759913, -122.444698),
new google.maps.LatLng(37.759623, -122.445065),
new google.maps.LatLng(37.758902, -122.445158),
new google.maps.LatLng(37.758428, -122.444570),
new google.maps.LatLng(37.757687, -122.443340),
new google.maps.LatLng(37.757583, -122.443240),
new google.maps.LatLng(37.757019, -122.442787),
new google.maps.LatLng(37.756603, -122.442322),
new google.maps.LatLng(37.756380, -122.441602),
new google.maps.LatLng(37.755790, -122.441382),
new google.maps.LatLng(37.754493, -122.442133),
new google.maps.LatLng(37.754361, -122.442206),
new google.maps.LatLng(37.753719, -122.442650),
new google.maps.LatLng(37.753096, -122.442915),
new google.maps.LatLng(37.751617, -122.443211),
new google.maps.LatLng(37.751496, -122.443246),
new google.maps.LatLng(37.750733, -122.443428),
new google.maps.LatLng(37.750126, -122.443536),
new google.maps.LatLng(37.750103, -122.443784),
new google.maps.LatLng(37.750390, -122.444010),
new google.maps.LatLng(37.750448, -122.444013),
new google.maps.LatLng(37.750536, -122.444040),
new google.maps.LatLng(37.750493, -122.444141),
new google.maps.LatLng(37.790859, -122.402808),
new google.maps.LatLng(37.790864, -122.402768),
new google.maps.LatLng(37.790995, -122.402539),
new google.maps.LatLng(37.791148, -122.402172),
new google.maps.LatLng(37.791385, -122.401312),
new google.maps.LatLng(37.791405, -122.400776),
new google.maps.LatLng(37.791288, -122.400528),
new google.maps.LatLng(37.791113, -122.400441),
new google.maps.LatLng(37.791027, -122.400395),
new google.maps.LatLng(37.791094, -122.400311),
new google.maps.LatLng(37.791211, -122.400183),
new google.maps.LatLng(37.791060, -122.399334),
new google.maps.LatLng(37.790538, -122.398718),
new google.maps.LatLng(37.790095, -122.398086),
new google.maps.LatLng(37.789644, -122.397360),
new google.maps.LatLng(37.789254, -122.396844),
new google.maps.LatLng(37.788855, -122.396397),
new google.maps.LatLng(37.788483, -122.395963),
new google.maps.LatLng(37.788015, -122.395365),
new google.maps.LatLng(37.787558, -122.394735),
new google.maps.LatLng(37.787472, -122.394323),
new google.maps.LatLng(37.787630, -122.394025),
new google.maps.LatLng(37.787767, -122.393987),
new google.maps.LatLng(37.787486, -122.394452),
new google.maps.LatLng(37.786977, -122.395043),
new google.maps.LatLng(37.786583, -122.395552),
new google.maps.LatLng(37.786540, -122.395610),
new google.maps.LatLng(37.786516, -122.395659),
new google.maps.LatLng(37.786378, -122.395707),
new google.maps.LatLng(37.786044, -122.395362),
new google.maps.LatLng(37.785598, -122.394715),
new google.maps.LatLng(37.785321, -122.394361),
new google.maps.LatLng(37.785207, -122.394236),
new google.maps.LatLng(37.785751, -122.394062),
new google.maps.LatLng(37.785996, -122.393881),
new google.maps.LatLng(37.786092, -122.393830),
new google.maps.LatLng(37.785998, -122.393899),
new google.maps.LatLng(37.785114, -122.394365),
new google.maps.LatLng(37.785022, -122.394441),
new google.maps.LatLng(37.784823, -122.394635),
new google.maps.LatLng(37.784719, -122.394629),
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];
}
google.maps.event.addDomListener(window, "load", initMap);html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}<script src="https://maps.googleapis.com/maps/api/js?libraries=visualization"></script>
<div id="map"></div>关于javascript - 去除Google map 热图的光晕效果，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36037232/