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kothic.js
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kothic.js
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/*
(c) 2013, Darafei Praliaskouski, Vladimir Agafonkin, Maksim Gurtovenko
Kothic JS is a full-featured JavaScript map rendering engine using HTML5 Canvas.
http://github.com/kothic/kothic-js
*/
var Kothic = {
render: function (canvas, data, zoom, options) {
if (typeof canvas === 'string') {
canvas = document.getElementById(canvas);
}
var styles = (options && options.styles) || [];
MapCSS.locales = (options && options.locales) || [];
var devicePixelRatio = Math.max(window.devicePixelRatio || 1, 2);
var width = canvas.width,
height = canvas.height;
if (devicePixelRatio !== 1) {
canvas.style.width = width + 'px';
canvas.style.height = height + 'px';
canvas.width = canvas.width * devicePixelRatio;
canvas.height = canvas.height * devicePixelRatio;
}
var ctx = canvas.getContext('2d');
ctx.scale(devicePixelRatio, devicePixelRatio);
var granularity = data.granularity,
ws = width / granularity, hs = height / granularity,
collisionBuffer = new Kothic.CollisionBuffer(height, width);
console.time('styles');
// setup layer styles
var layers = Kothic.style.populateLayers(data.features, zoom, styles),
layerIds = Kothic.getLayerIds(layers);
// render the map
Kothic.style.setStyles(ctx, Kothic.style.defaultCanvasStyles);
console.timeEnd('styles');
Kothic.getFrame(function () {
console.time('geometry');
Kothic._renderBackground(ctx, width, height, zoom, styles);
Kothic._renderGeometryFeatures(layerIds, layers, ctx, ws, hs, granularity);
if (options && options.onRenderComplete) {
options.onRenderComplete();
}
console.timeEnd('geometry');
Kothic.getFrame(function () {
console.time('text/icons');
Kothic._renderTextAndIcons(layerIds, layers, ctx, ws, hs, collisionBuffer);
console.timeEnd('text/icons');
//Kothic._renderCollisions(ctx, collisionBuffer.buffer.data);
});
});
},
_renderCollisions: function (ctx, node) {
var i, len, a;
if (node.leaf) {
for (i = 0, len = node.children.length; i < len; i++) {
ctx.strokeStyle = 'red';
ctx.lineWidth = 1;
a = node.children[i];
ctx.strokeRect(Math.round(a[0]), Math.round(a[1]), Math.round(a[2] - a[0]), Math.round(a[3] - a[1]));
}
} else {
for (i = 0, len = node.children.length; i < len; i++) {
this._renderCollisions(ctx, node.children[i]);
}
}
},
getLayerIds: function (layers) {
return Object.keys(layers).sort(function (a, b) {
return parseInt(a, 10) - parseInt(b, 10);
});
},
getFrame: function (fn) {
var reqFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
reqFrame.call(window, fn);
},
_renderBackground: function (ctx, width, height, zoom, styles) {
var style = MapCSS.restyle(styles, {}, {}, zoom, 'canvas', 'canvas');
var fillRect = function () {
ctx.fillRect(-1, -1, width + 1, height + 1);
};
for (var i in style) {
Kothic.polygon.fill(ctx, style[i], fillRect);
}
},
_renderGeometryFeatures: function (layerIds, layers, ctx, ws, hs, granularity) {
var layersToRender = {},
i, j, len, features, style, queue, bgQueue;
// polygons
for (i = 0; i < layerIds.length; i++) {
features = layers[layerIds[i]];
bgQueue = layersToRender._bg = layersToRender._bg || {};
queue = layersToRender[layerIds[i]] = layersToRender[layerIds[i]] || {};
for (j = 0, len = features.length; j < len; j++) {
style = features[j].style;
if ('fill-color' in style || 'fill-image' in style) {
if (style['fill-position'] === 'background') {
bgQueue.polygons = bgQueue.polygons || [];
bgQueue.polygons.push(features[j]);
} else {
queue.polygons = queue.polygons || [];
queue.polygons.push(features[j]);
}
}
}
}
// casings
for (i = 0; i < layerIds.length; i++) {
features = layers[layerIds[i]];
queue = layersToRender[layerIds[i]] = layersToRender[layerIds[i]] || {};
for (j = 0, len = features.length; j < len; j++) {
if ('casing-width' in features[j].style) {
queue.casings = queue.casings || [];
queue.casings.push(features[j]);
}
}
}
// lines
for (i = 0; i < layerIds.length; i++) {
features = layers[layerIds[i]];
queue = layersToRender[layerIds[i]] = layersToRender[layerIds[i]] || {};
for (j = 0, len = features.length; j < len; j++) {
if ('width' in features[j].style) {
queue.lines = queue.lines || [];
queue.lines.push(features[j]);
}
}
}
layerIds = ['_bg'].concat(layerIds);
for (i = 0; i < layerIds.length; i++) {
queue = layersToRender[layerIds[i]];
if (queue.polygons) {
for (j = 0, len = queue.polygons.length; j < len; j++) {
Kothic.polygon.render(ctx, queue.polygons[j], queue.polygons[j + 1], ws, hs, granularity);
}
}
if (queue.casings) {
ctx.lineCap = 'butt';
for (j = 0, len = queue.casings.length; j < len; j++) {
Kothic.line.renderCasing(ctx, queue.casings[j], queue.casings[j + 1], ws, hs, granularity);
}
}
if (queue.lines) {
ctx.lineCap = 'round';
for (j = 0, len = queue.lines.length; j < len; j++) {
Kothic.line.render(ctx, queue.lines[j], queue.lines[j + 1], ws, hs, granularity);
}
}
}
},
_renderTextAndIcons: function (layerIds, layers, ctx, ws, hs, collisionBuffer) {
//TODO: Move to the features detector
var j, style, i,
passes = [];
for (i = 0; i < layerIds.length; i++) {
var features = layers[layerIds[i]],
featuresLen = features.length;
// render icons without text
for (j = featuresLen - 1; j >= 0; j--) {
style = features[j].style;
if (style.hasOwnProperty('icon-image') && !style.text) {
Kothic.texticons.render(ctx, features[j], collisionBuffer, ws, hs, false, true);
}
}
// render text on features without icons
for (j = featuresLen - 1; j >= 0; j--) {
style = features[j].style;
if (!style.hasOwnProperty('icon-image') && style.text) {
Kothic.texticons.render(ctx, features[j], collisionBuffer, ws, hs, true, false);
}
}
// for features with both icon and text, render both or neither
for (j = featuresLen - 1; j >= 0; j--) {
style = features[j].style;
if (style.hasOwnProperty('icon-image') && style.text) {
Kothic.texticons.render(ctx, features[j], collisionBuffer, ws, hs, true, true);
}
}
// render shields with text
for (j = featuresLen - 1; j >= 0; j--) {
style = features[j].style;
if (style['shield-text']) {
Kothic.shields.render(ctx, features[j], collisionBuffer, ws, hs);
}
}
}
return passes;
}
};
;
Kothic.line = {
renderCasing: function (ctx, feature, nextFeature, ws, hs, granularity) {
var style = feature.style,
nextStyle = nextFeature && nextFeature.style;
if (!this.pathOpened) {
this.pathOpened = true;
ctx.beginPath();
}
Kothic.path(ctx, feature, style["casing-dashes"] || style.dashes, false, ws, hs, granularity);
if (nextFeature &&
nextStyle.width === style.width &&
nextStyle['casing-width'] === style['casing-width'] &&
nextStyle['casing-color'] === style['casing-color'] &&
nextStyle['casing-dashes'] === style['casing-dashes'] &&
nextStyle['casing-opacity'] === style['casing-opacity']) {
return;
}
Kothic.style.setStyles(ctx, {
lineWidth: 2 * style["casing-width"] + (style.hasOwnProperty("width") ? style.width : 0),
strokeStyle: style["casing-color"] || "#000000",
lineCap: style["casing-linecap"] || style.linecap || "butt",
lineJoin: style["casing-linejoin"] || style.linejoin || "round",
globalAlpha: style["casing-opacity"] || 1
});
ctx.stroke();
this.pathOpened = false;
},
render: function (ctx, feature, nextFeature, ws, hs, granularity) {
var style = feature.style,
nextStyle = nextFeature && nextFeature.style;
if (!this.pathOpened) {
this.pathOpened = true;
ctx.beginPath();
}
Kothic.path(ctx, feature, style.dashes, false, ws, hs, granularity);
if (nextFeature &&
nextStyle.width === style.width &&
nextStyle.color === style.color &&
nextStyle.image === style.image &&
nextStyle.opacity === style.opacity) {
return;
}
if ('color' in style || !('image' in style)) {
var t_width = style.width || 1,
t_linejoin = "round",
t_linecap = "round";
if (t_width <= 2) {
t_linejoin = "miter";
t_linecap = "butt";
}
Kothic.style.setStyles(ctx, {
lineWidth: t_width,
strokeStyle: style.color || '#000000',
lineCap: style.linecap || t_linecap,
lineJoin: style.linejoin || t_linejoin,
globalAlpha: style.opacity || 1,
miterLimit: 4
});
ctx.stroke();
}
if ('image' in style) {
// second pass fills with texture
var image = MapCSS.getImage(style.image);
if (image) {
Kothic.style.setStyles(ctx, {
strokeStyle: ctx.createPattern(image, 'repeat') || "#000000",
lineWidth: style.width || 1,
lineCap: style.linecap || "round",
lineJoin: style.linejoin || "round",
globalAlpha: style.opacity || 1
});
ctx.stroke();
}
}
this.pathOpened = false;
},
pathOpened: false
};
;
Kothic.path = (function () {
var dashPattern;
function setDashPattern(point, dashes) {
dashPattern = {
pattern: dashes,
seg: 0,
phs: 0,
x: point[0],
y: point[1]
};
}
function moveTo(ctx, point, dashes) {
ctx.moveTo(point[0], point[1]);
if (dashes) {
setDashPattern(point, dashes);
}
}
function dashTo(ctx, point) {
var pt = dashPattern,
dx = point[0] - pt.x,
dy = point[1] - pt.y,
dist = Math.sqrt(dx * dx + dy * dy),
x, more, t;
ctx.save();
ctx.translate(pt.x, pt.y);
ctx.rotate(Math.atan2(dy, dx));
ctx.moveTo(0, 0);
x = 0;
do {
t = pt.pattern[pt.seg];
x += t - pt.phs;
more = x < dist;
if (!more) {
pt.phs = t - (x - dist);
x = dist;
}
ctx[pt.seg % 2 ? 'moveTo' : 'lineTo'](x, 0);
if (more) {
pt.phs = 0;
pt.seg = ++pt.seg % pt.pattern.length;
}
} while (more);
pt.x = point[0];
pt.y = point[1];
ctx.restore();
}
function isTileBoundary(p, size) {
return p[0] === 0 || p[0] === size || p[1] === 0 || p[1] === size;
}
return function (ctx, feature, dashes, fill, ws, hs, granularity) {
var type = feature.type,
coords = feature.coordinates;
if (type === "Polygon") {
coords = [coords];
type = "MultiPolygon";
}
if (type === "LineString") {
coords = [coords];
type = "MultiLineString";
}
var i, j, k,
points,
len = coords.length,
len2, pointsLen,
prevPoint, point, screenPoint,
dx, dy, dist, pad = 50;
if (type === "MultiPolygon") {
for (i = 0; i < len; i++) {
for (k = 0, len2 = coords[i].length; k < len2; k++) {
points = coords[i][k];
pointsLen = points.length;
prevPoint = points[0];
for (j = 0; j <= pointsLen; j++) {
point = points[j] || points[0];
screenPoint = Kothic.geom.transformPoint(point, ws, hs);
if (j === 0 || (!fill &&
isTileBoundary(point, granularity) &&
isTileBoundary(prevPoint, granularity))) {
moveTo(ctx, screenPoint, dashes);
} else if (fill || !dashes) {
ctx.lineTo(screenPoint[0], screenPoint[1]);
} else {
dashTo(ctx, screenPoint);
}
prevPoint = point;
}
}
}
}
if (type === "MultiLineString") {
for (i = 0; i < len; i++) {
points = coords[i];
pointsLen = points.length;
for (j = 0; j < pointsLen; j++) {
point = points[j];
screenPoint = Kothic.geom.transformPoint(point, ws, hs);
// continue path off the tile by some abount to fix path edges between tiles
if ((j === 0 || j === pointsLen - 1) && isTileBoundary(point, granularity)) {
prevPoint = points[j ? pointsLen - 2 : 1];
dx = point[0] - prevPoint[0];
dy = point[1] - prevPoint[1];
dist = Math.sqrt(dx * dx + dy * dy);
screenPoint[0] = screenPoint[0] + pad * dx / dist;
screenPoint[1] = screenPoint[1] + pad * dy / dist;
}
if (j === 0) {
moveTo(ctx, screenPoint, dashes);
} else if (dashes) {
dashTo(ctx, screenPoint);
} else {
ctx.lineTo(screenPoint[0], screenPoint[1]);
}
}
}
}
};
}());
;
Kothic.polygon = {
render: function (ctx, feature, nextFeature, ws, hs, granularity) {
var style = feature.style,
nextStyle = nextFeature && nextFeature.style;
if (!this.pathOpened) {
this.pathOpened = true;
ctx.beginPath();
}
Kothic.path(ctx, feature, false, true, ws, hs, granularity);
if (nextFeature &&
(nextStyle['fill-color'] === style['fill-color']) &&
(nextStyle['fill-image'] === style['fill-image']) &&
(nextStyle['fill-opacity'] === style['fill-opacity'])) {
return;
}
this.fill(ctx, style);
this.pathOpened = false;
},
fill: function (ctx, style, fillFn) {
var opacity = style["fill-opacity"] || style.opacity, image;
if (style.hasOwnProperty('fill-color')) {
// first pass fills with solid color
Kothic.style.setStyles(ctx, {
fillStyle: style["fill-color"] || "#000000",
globalAlpha: opacity || 1
});
if (fillFn) {
fillFn();
} else {
ctx.fill();
}
}
if (style.hasOwnProperty('fill-image')) {
// second pass fills with texture
image = MapCSS.getImage(style['fill-image']);
if (image) {
Kothic.style.setStyles(ctx, {
fillStyle: ctx.createPattern(image, 'repeat'),
globalAlpha: opacity || 1
});
if (fillFn) {
fillFn();
} else {
ctx.fill();
}
}
}
}
};
;
Kothic.shields = {
render: function (ctx, feature, collides, ws, hs) {
var style = feature.style, reprPoint = Kothic.geom.getReprPoint(feature),
point, img, len = 0, found = false, i, sgn;
if (!reprPoint) {
return;
}
point = Kothic.geom.transformPoint(reprPoint, ws, hs);
if (style["shield-image"]) {
img = MapCSS.getImage(style["icon-image"]);
if (!img) {
return;
}
}
Kothic.style.setStyles(ctx, {
font: Kothic.style.getFontString(style["shield-font-family"] || style["font-family"], style["shield-font-size"] || style["font-size"]),
fillStyle: style["shield-text-color"] || "#000000",
globalAlpha: style["shield-text-opacity"] || style.opacity || 1,
textAlign: 'center',
textBaseline: 'middle'
});
var text = String(style['shield-text']),
textWidth = ctx.measureText(text).width,
letterWidth = textWidth / text.length,
collisionWidth = textWidth + 2,
collisionHeight = letterWidth * 1.8;
if (feature.type === 'LineString') {
len = Kothic.geom.getPolyLength(feature.coordinates);
if (Math.max(collisionHeight / hs, collisionWidth / ws) > len) {
return;
}
for (i = 0, sgn = 1; i < len / 2; i += Math.max(len / 30, collisionHeight / ws), sgn *= -1) {
reprPoint = Kothic.geom.getAngleAndCoordsAtLength(feature.coordinates, len / 2 + sgn * i, 0);
if (!reprPoint) {
break;
}
reprPoint = [reprPoint[1], reprPoint[2]];
point = Kothic.geom.transformPoint(reprPoint, ws, hs);
if (img && (style["allow-overlap"] !== "true") &&
collides.checkPointWH(point, img.width, img.height, feature.kothicId)) {
continue;
}
if ((style["allow-overlap"] !== "true") &&
collides.checkPointWH(point, collisionWidth, collisionHeight, feature.kothicId)) {
continue;
}
found = true;
break;
}
}
if (!found) {
return;
}
if (style["shield-casing-width"]) {
Kothic.style.setStyles(ctx, {
fillStyle: style["shield-casing-color"] || "#000000",
globalAlpha: style["shield-casing-opacity"] || style.opacity || 1
});
ctx.fillRect(point[0] - collisionWidth / 2 - (style["shield-casing-width"] || 0) - (style["shield-frame-width"] || 0),
point[1] - collisionHeight / 2 - (style["shield-casing-width"] || 0) - (style["shield-frame-width"] || 0),
collisionWidth + 2 * (style["shield-casing-width"] || 0) + 2 * (style["shield-frame-width"] || 0),
collisionHeight + 2 * (style["shield-casing-width"] || 0) + 2 * (style["shield-frame-width"] || 0));
}
if (style["shield-frame-width"]) {
Kothic.style.setStyles(ctx, {
fillStyle: style["shield-frame-color"] || "#000000",
globalAlpha: style["shield-frame-opacity"] || style.opacity || 1
});
ctx.fillRect(point[0] - collisionWidth / 2 - (style["shield-frame-width"] || 0),
point[1] - collisionHeight / 2 - (style["shield-frame-width"] || 0),
collisionWidth + 2 * (style["shield-frame-width"] || 0),
collisionHeight + 2 * (style["shield-frame-width"] || 0));
}
if (style["shield-color"]) {
Kothic.style.setStyles(ctx, {
fillStyle: style["shield-color"] || "#000000",
globalAlpha: style["shield-opacity"] || style.opacity || 1
});
ctx.fillRect(point[0] - collisionWidth / 2,
point[1] - collisionHeight / 2,
collisionWidth,
collisionHeight);
}
if (img) {
ctx.drawImage(img,
Math.floor(point[0] - img.width / 2),
Math.floor(point[1] - img.height / 2));
}
Kothic.style.setStyles(ctx, {
fillStyle: style["shield-text-color"] || "#000000",
globalAlpha: style["shield-text-opacity"] || style.opacity || 1
});
ctx.fillText(text, point[0], Math.ceil(point[1]));
if (img) {
collides.addPointWH(point, img.width, img.height, 0, feature.kothicId);
}
collides.addPointWH(point, collisionHeight, collisionWidth,
(parseFloat(style["shield-casing-width"]) || 0) + (parseFloat(style["shield-frame-width"]) || 0) + (parseFloat(style["-x-mapnik-min-distance"]) || 30), feature.kothicId);
}
};
;
Kothic.textOnPath = (function () {
function getWidth(ctx, text) {
return ctx.measureText(text).width;
}
function getTextCenter(axy, textWidth) {
return [axy[1] + 0.5 * Math.cos(axy[0]) * textWidth,
axy[2] + 0.5 * Math.sin(axy[0]) * textWidth];
}
function getCollisionParams(textWidth, axy, pxoffset) {
var textHeight = textWidth * 1.5,
cos = Math.abs(Math.cos(axy[0])),
sin = Math.abs(Math.sin(axy[0])),
w = cos * textWidth + sin * textHeight,
h = sin * textWidth + cos * textHeight;
return [getTextCenter(axy, textWidth + 2 * (pxoffset || 0)), w, h, 0];
}
function checkCollision(collisions, ctx, text, axy, letterWidth) {
var textWidth = getWidth(ctx, text);
for (var i = 0; i < textWidth; i += letterWidth) {
if (collisions.checkPointWH.apply(collisions, getCollisionParams(letterWidth, axy, i))) {
return true;
}
}
return false;
}
function addCollision(collisions, ctx, text, axy, letterWidth) {
var textWidth = getWidth(ctx, text),
params = [];
for (var i = 0; i < textWidth; i += letterWidth) {
params.push(getCollisionParams(letterWidth, axy, i));
}
collisions.addPoints(params);
}
function renderText(ctx, axy, halo) {
var text = axy[4],
textCenter = getTextCenter(axy, getWidth(ctx, text));
ctx.translate(textCenter[0], textCenter[1]);
ctx.rotate(axy[0]);
ctx[halo ? 'strokeText' : 'fillText'](text, 0, 0);
ctx.rotate(-axy[0]);
ctx.translate(-textCenter[0], -textCenter[1]);
}
return function (ctx, points, text, halo, collisions) {
//widthCache = {};
// simplify points?
var textWidth = ctx.measureText(text).width,
textLen = text.length,
pathLen = Kothic.geom.getPolyLength(points);
if (pathLen < textWidth) {
return; // if label won't fit - don't try to
}
var avgLetterWidth = getWidth(ctx, 'a');
var letter,
widthUsed,
prevAngle,
positions,
solution = 0,
flipCount,
flipped = false,
axy,
letterWidth,
i,
maxAngle = Math.PI / 6;
// iterating solutions - start from center or from one of the ends
while (solution < 2) { //TODO change to for?
widthUsed = solution ? getWidth(ctx, text.charAt(0)) : (pathLen - textWidth) / 2; // ???
flipCount = 0;
prevAngle = null;
positions = [];
// iterating label letter by letter (should be fixed to support ligatures/CJK, ok for Cyrillic/latin)
for (i = 0; i < textLen; i++) {
letter = text.charAt(i);
letterWidth = getWidth(ctx, letter);
axy = Kothic.geom.getAngleAndCoordsAtLength(points, widthUsed, letterWidth);
// if cannot fit letter - restart with next solution
if (widthUsed >= pathLen || !axy) {
solution++;
positions = [];
if (flipped) { // if label was flipped, flip it back
points.reverse();
flipped = false;
}
break;
}
if (!prevAngle) {
prevAngle = axy[0];
}
// if label collisions with another, restart it from here
if (checkCollision(collisions, ctx, letter, axy, avgLetterWidth) || Math.abs(prevAngle - axy[0]) > maxAngle) {
widthUsed += letterWidth;
i = -1;
positions = [];
flipCount = 0;
continue;
}
while (letterWidth < axy[3] && i < textLen) { // try adding following letters to current, until line changes its direction
i++;
letter += text.charAt(i);
letterWidth = getWidth(ctx, letter);
if (checkCollision(collisions, ctx, letter, axy, avgLetterWidth)) {
i = 0;
widthUsed += letterWidth;
positions = [];
flipCount = 0;
letter = text.charAt(i);
letterWidth = getWidth(ctx, letter);
axy = Kothic.geom.getAngleAndCoordsAtLength(points, widthUsed, letterWidth);
break;
}
if (letterWidth >= axy[3]) {
i--;
letter = letter.slice(0, -1);
letterWidth = getWidth(ctx, letter);
break;
}
}
if (!axy) {
continue;
}
if ((axy[0] > (Math.PI / 2)) || (axy[0] < (-Math.PI / 2))) { // if current letters cluster was upside-down, count it
flipCount += letter.length;
}
prevAngle = axy[0];
axy.push(letter);
positions.push(axy);
widthUsed += letterWidth;
} //for
if (flipCount > textLen / 2) { // if more than half of the text is upside down, flip it and restart
points.reverse();
positions = [];
if (flipped) { // if it was flipped twice - restart with other start point solution
solution++;
points.reverse();
flipped = false;
} else {
flipped = true;
}
}
if (solution >= 2) {
return;
}
if (positions.length > 0) {
break;
}
} //while
var posLen = positions.length;
for (i = 0; halo && (i < posLen); i++) {
renderText(ctx, positions[i], true);
}
for (i = 0; i < posLen; i++) {
axy = positions[i];
renderText(ctx, axy);
addCollision(collisions, ctx, axy[4], axy, avgLetterWidth);
}
};
}());
;
Kothic.texticons = {
render: function (ctx, feature, collides, ws, hs, renderText, renderIcon) {
var style = feature.style, img, point, w, h;
if (renderIcon || (renderText && feature.type !== 'LineString')) {
var reprPoint = Kothic.geom.getReprPoint(feature);
if (!reprPoint) {
return;
}
point = Kothic.geom.transformPoint(reprPoint, ws, hs);
}
if (renderIcon) {
img = MapCSS.getImage(style['icon-image']);
if (!img) { return; }
w = img.width;
h = img.height;
if (style['icon-width'] || style['icon-height']){
if (style['icon-width']) {
w = style['icon-width'];
h = img.height * w / img.width;
}
if (style['icon-height']) {
h = style['icon-height'];
if (!style['icon-width']) {
w = img.width * h / img.height;
}
}
}
if ((style['allow-overlap'] !== 'true') &&
collides.checkPointWH(point, w, h, feature.kothicId)) {
return;
}
}
if (renderText) {
Kothic.style.setStyles(ctx, {
lineWidth: style['text-halo-radius'] * 2,
font: Kothic.style.getFontString(style['font-family'], style['font-size'])
});
var text = String(style.text),
textWidth = ctx.measureText(text).width,
letterWidth = textWidth / text.length,
collisionWidth = textWidth,
collisionHeight = letterWidth * 2.5,
offset = style['text-offset'] || 0;
var halo = (style.hasOwnProperty('text-halo-radius'));
Kothic.style.setStyles(ctx, {
fillStyle: style['text-color'] || '#000000',
strokeStyle: style['text-halo-color'] || '#ffffff',
globalAlpha: style['text-opacity'] || style.opacity || 1,
textAlign: 'center',
textBaseline: 'middle'
});
if (feature.type === 'Polygon' || feature.type === 'Point') {
if ((style['text-allow-overlap'] !== 'true') &&
collides.checkPointWH([point[0], point[1] + offset], collisionWidth, collisionHeight, feature.kothicId)) {
return;
}
if (halo) {
ctx.strokeText(text, point[0], point[1] + offset);
}
ctx.fillText(text, point[0], point[1] + offset);
var padding = style['-x-kot-min-distance'] || 20;
collides.addPointWH([point[0], point[1] + offset], collisionWidth, collisionHeight, padding, feature.kothicId);
} else if (feature.type === 'LineString') {
var points = Kothic.geom.transformPoints(feature.coordinates, ws, hs);
Kothic.textOnPath(ctx, points, text, halo, collides);
}
}
if (renderIcon) {
ctx.drawImage(img,
Math.floor(point[0] - w / 2),
Math.floor(point[1] - h / 2), w, h);
var padding2 = parseFloat(style['-x-kot-min-distance']) || 0;
collides.addPointWH(point, w, h, padding2, feature.kothicId);
}
}
};
;
var MapCSS = {
styles: {},
availableStyles: [],
images: {},
locales: [],
presence_tags: [],
value_tags: [],
cache: {},
debug: {hit: 0, miss: 0},
onError: function () {
},
onImagesLoad: function () {
},
/**
* Incalidate styles cache
*/
invalidateCache: function () {
this.cache = {};
},
e_min: function (/*...*/) {
return Math.min.apply(null, arguments);
},
e_max: function (/*...*/) {
return Math.max.apply(null, arguments);
},
e_any: function (/*...*/) {
var i;
for (i = 0; i < arguments.length; i++) {
if (typeof(arguments[i]) !== 'undefined' && arguments[i] !== '') {
return arguments[i];
}
}
return '';
},
e_num: function (arg) {
if (!isNaN(parseFloat(arg))) {
return parseFloat(arg);
} else {
return '';
}
},
e_str: function (arg) {
return arg;
},
e_int: function (arg) {
return parseInt(arg, 10);
},
e_tag: function (obj, tag) {
if (obj.hasOwnProperty(tag) && obj[tag] !== null) {
return tag;
} else {
return '';
}
},