我正在尝试让谷歌地图显示一个可以用来缩放的图像。我在大部分工作中都使用了本教程,但我遇到了两个问题。
- 我尝试自然显示的图像是256x193。图像被拉伸以适合256x256。我如何让谷歌地图知道只显示256x193的图像
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我正在尝试绑定框,以便图像始终在视图中,而不是背景。我很接近,但我一直在寻找更好的解决方案。我正在使用的那个只限制中心。如果平移,我仍然可以部分看到地图背景。
var allowedBounds = null; var lastValidCenter = null; google.maps.event.addListenerOnce(map, 'idle', function(){ allowedBounds = map.getBounds(); lastValidCenter = map.getCenter(); }); google.maps.event.addListener(map, 'center_changed', function() { if (allowedBounds.contains(map.getCenter())) { lastValidCenter = map.getCenter(); return; } map.panTo(lastValidCenter); });
PS。我使用谷歌是因为我有点迷恋他们。如果有更好、更标准的解决方案可以让我用多个图像级别进行缩放,请告诉我。
更新:我的随机图像大小工作!下面的代码修改了上面教程启动的
Demo.ImgMapType.prototype.imageSize= new google.maps.Size(256, 193);
Demo.ImgMapType.prototype.getTile = function (coord, zoom, ownerDocument) {
var tilesCount = Math.pow(2, zoom);
var maxWidth = this.imageSize.width * tilesCount;
var maxHeight = this.imageSize.height * tilesCount;
var width = this.tileSize.width;
var height = this.tileSize.height;
var maxX = width * (1 + coord.x);
var maxY = height * (1 + coord.y);
if (maxX > maxWidth){
width = width - (maxX - maxWidth);
}
if (maxY > maxHeight){
height = height - (maxY - maxHeight);
}
var div = ownerDocument.createElement('div');
div.style.width = this.tileSize.width + 'px';
div.style.height = this.tileSize.height + 'px';
div.style.backgroundColor = this._backgroundColor;
if (width <= 0 || coord.x < 0 || height <= 0 || coord.y < 0) {
return div;
}
var img = ownerDocument.createElement('IMG');
img.width = width;
img.height = height;
img.src = Demo.Utils.GetImageUrl(this._theme + '_' + zoom + '_' + coord.x + '_' + coord.y + '.jpg');
// Add the image to the div so that we hide the map background
div.appendChild(img);
return div;
};
根据平台和语言的不同,您可以让处理上传的脚本分析图像并相应地填充。这并不难。
不知道如何处理。
至于边界:我如何限制谷歌地图API V3中的平移?
我得到了随机图像大小工作!下面的代码修改了我提到的启动的教程
Demo.ImgMapType.prototype.imageSize= new google.maps.Size(256, 193);
Demo.ImgMapType.prototype.getTile = function (coord, zoom, ownerDocument) {
var tilesCount = Math.pow(2, zoom);
var maxWidth = this.imageSize.width * tilesCount;
var maxHeight = this.imageSize.height * tilesCount;
var width = this.tileSize.width;
var height = this.tileSize.height;
var maxX = width * (1 + coord.x);
var maxY = height * (1 + coord.y);
if (maxX > maxWidth){
width = width - (maxX - maxWidth);
}
if (maxY > maxHeight){
height = height - (maxY - maxHeight);
}
var div = ownerDocument.createElement('div');
div.style.width = this.tileSize.width + 'px';
div.style.height = this.tileSize.height + 'px';
div.style.backgroundColor = this._backgroundColor;
if (width <= 0 || coord.x < 0 || height <= 0 || coord.y < 0) {
return div;
}
var img = ownerDocument.createElement('IMG');
img.width = width;
img.height = height;
img.src = Demo.Utils.GetImageUrl(this._theme + '_' + zoom + '_' + coord.x + '_' + coord.y + '.jpg');
// Add the image to the div so that we hide the map background
div.appendChild(img);
return div;
};