@ngageoint/geopackage
Version:
GeoPackage JavaScript Library
150 lines • 7.16 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.HtmlCanvasAdapter = void 0;
/**
* Browser based canvas adapter
*/
var HtmlCanvasAdapter = /** @class */ (function () {
function HtmlCanvasAdapter() {
}
HtmlCanvasAdapter.prototype.initialize = function () {
return new Promise(function (resolve) {
HtmlCanvasAdapter.initialized = true;
resolve();
});
};
HtmlCanvasAdapter.prototype.isInitialized = function () {
return HtmlCanvasAdapter.initialized;
};
HtmlCanvasAdapter.prototype.create = function (width, height) {
var c = document.createElement('canvas');
c.width = width;
c.height = height;
return c;
};
HtmlCanvasAdapter.prototype.createImage = function (data, contentType) {
return new Promise(function (resolve, reject) {
var src = data;
if (data instanceof Buffer || Object.prototype.toString.call(data) === '[object Uint8Array]') {
src = URL.createObjectURL(new Blob([data], { type: contentType }));
}
var image = new Image();
image.onload = function () {
var result = {
image: image,
width: image.width,
height: image.height,
};
resolve(result);
};
image.onerror = function (error) {
reject(error);
};
image.crossOrigin = 'Anonymous';
image.src = src;
});
};
HtmlCanvasAdapter.prototype.createImageData = function (width, height) {
return new ImageData(width, height);
};
HtmlCanvasAdapter.prototype.disposeCanvas = function (canvas) {
canvas = null;
};
HtmlCanvasAdapter.prototype.measureText = function (context, fontFace, fontSize, text) {
context.save();
context.font = fontSize + 'px' + (fontFace != null ? (' \'' + fontFace + '\'') : '');
context.textBaseline = 'middle';
context.textAlign = 'center';
var width = context.measureText(text).width;
context.restore();
return width;
};
HtmlCanvasAdapter.prototype.drawText = function (context, text, location, fontFace, fontSize, fontColor) {
context.save();
context.font = fontSize + 'px' + (fontFace != null ? (' \'' + fontFace + '\'') : '');
context.fillStyle = fontColor;
context.textBaseline = 'middle';
context.textAlign = 'center';
context.fillText(text, location[0], location[1]);
context.restore();
};
HtmlCanvasAdapter.prototype.scaleImage = function (image, scale) {
return __awaiter(this, void 0, void 0, function () {
var scaledWidth, scaledHeight;
return __generator(this, function (_a) {
if (scale === 1.0) {
return [2 /*return*/, image];
}
scaledWidth = Math.round(scale * image.width);
scaledHeight = Math.round(scale * image.height);
return [2 /*return*/, this.scaleImageToDimensions(image, scaledWidth, scaledHeight)];
});
});
};
HtmlCanvasAdapter.prototype.scaleImageToDimensions = function (image, scaledWidth, scaledHeight) {
return __awaiter(this, void 0, void 0, function () {
var canvas, ctx, result, _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
canvas = this.create(scaledWidth, scaledHeight);
ctx = canvas.getContext('2d');
ctx.drawImage(image.image, 0, 0, scaledWidth, scaledHeight);
_a = this.createImage;
return [4 /*yield*/, this.toDataURL(canvas, 'image/png')];
case 1: return [4 /*yield*/, _a.apply(this, [_b.sent(), 'image/png'])];
case 2:
result = _b.sent();
this.disposeCanvas(canvas);
return [2 /*return*/, result];
}
});
});
};
HtmlCanvasAdapter.prototype.toDataURL = function (canvas, format) {
if (format === void 0) { format = 'image/png'; }
return Promise.resolve(canvas.toDataURL(format));
};
HtmlCanvasAdapter.prototype.disposeImage = function (image) {
};
HtmlCanvasAdapter.initialized = false;
return HtmlCanvasAdapter;
}());
exports.HtmlCanvasAdapter = HtmlCanvasAdapter;
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