{"version":3,"file":"reproj.js","sources":["../../src/ol/reproj.js"],"sourcesContent":["/**\n * @module ol/reproj\n */\nimport {createCanvasContext2D} from './dom.js';\nimport {containsCoordinate, createEmpty, extend, getHeight, getTopLeft, getWidth} from './extent.js';\nimport {solveLinearSystem} from './math.js';\nimport {getPointResolution, transform} from './proj.js';\n\n\n/**\n * Calculates ideal resolution to use from the source in order to achieve\n * pixel mapping as close as possible to 1:1 during reprojection.\n * The resolution is calculated regardless of what resolutions\n * are actually available in the dataset (TileGrid, Image, ...).\n *\n * @param {module:ol/proj/Projection} sourceProj Source projection.\n * @param {module:ol/proj/Projection} targetProj Target projection.\n * @param {module:ol/coordinate~Coordinate} targetCenter Target center.\n * @param {number} targetResolution Target resolution.\n * @return {number} The best resolution to use. Can be +-Infinity, NaN or 0.\n */\nexport function calculateSourceResolution(sourceProj, targetProj,\n  targetCenter, targetResolution) {\n\n  const sourceCenter = transform(targetCenter, targetProj, sourceProj);\n\n  // calculate the ideal resolution of the source data\n  let sourceResolution = getPointResolution(targetProj, targetResolution, targetCenter);\n\n  const targetMetersPerUnit = targetProj.getMetersPerUnit();\n  if (targetMetersPerUnit !== undefined) {\n    sourceResolution *= targetMetersPerUnit;\n  }\n  const sourceMetersPerUnit = sourceProj.getMetersPerUnit();\n  if (sourceMetersPerUnit !== undefined) {\n    sourceResolution /= sourceMetersPerUnit;\n  }\n\n  // Based on the projection properties, the point resolution at the specified\n  // coordinates may be slightly different. We need to reverse-compensate this\n  // in order to achieve optimal results.\n\n  const sourceExtent = sourceProj.getExtent();\n  if (!sourceExtent || containsCoordinate(sourceExtent, sourceCenter)) {\n    const compensationFactor = getPointResolution(sourceProj, sourceResolution, sourceCenter) /\n        sourceResolution;\n    if (isFinite(compensationFactor) && compensationFactor > 0) {\n      sourceResolution /= compensationFactor;\n    }\n  }\n\n  return sourceResolution;\n}\n\n\n/**\n * Enlarge the clipping triangle point by 1 pixel to ensure the edges overlap\n * in order to mask gaps caused by antialiasing.\n *\n * @param {number} centroidX Centroid of the triangle (x coordinate in pixels).\n * @param {number} centroidY Centroid of the triangle (y coordinate in pixels).\n * @param {number} x X coordinate of the point (in pixels).\n * @param {number} y Y coordinate of the point (in pixels).\n * @return {module:ol/coordinate~Coordinate} New point 1 px farther from the centroid.\n */\nfunction enlargeClipPoint(centroidX, centroidY, x, y) {\n  const dX = x - centroidX;\n  const dY = y - centroidY;\n  const distance = Math.sqrt(dX * dX + dY * dY);\n  return [Math.round(x + dX / distance), Math.round(y + dY / distance)];\n}\n\n\n/**\n * Renders the source data into new canvas based on the triangulation.\n *\n * @param {number} width Width of the canvas.\n * @param {number} height Height of the canvas.\n * @param {number} pixelRatio Pixel ratio.\n * @param {number} sourceResolution Source resolution.\n * @param {module:ol/extent~Extent} sourceExtent Extent of the data source.\n * @param {number} targetResolution Target resolution.\n * @param {module:ol/extent~Extent} targetExtent Target extent.\n * @param {module:ol/reproj/Triangulation} triangulation\n * Calculated triangulation.\n * @param {Array.<{extent: module:ol/extent~Extent,\n *                 image: (HTMLCanvasElement|HTMLImageElement|HTMLVideoElement)}>} sources\n * Array of sources.\n * @param {number} gutter Gutter of the sources.\n * @param {boolean=} opt_renderEdges Render reprojection edges.\n * @return {HTMLCanvasElement} Canvas with reprojected data.\n */\nexport function render(width, height, pixelRatio,\n  sourceResolution, sourceExtent, targetResolution, targetExtent,\n  triangulation, sources, gutter, opt_renderEdges) {\n\n  const context = createCanvasContext2D(Math.round(pixelRatio * width),\n    Math.round(pixelRatio * height));\n\n  if (sources.length === 0) {\n    return context.canvas;\n  }\n\n  context.scale(pixelRatio, pixelRatio);\n\n  const sourceDataExtent = createEmpty();\n  sources.forEach(function(src, i, arr) {\n    extend(sourceDataExtent, src.extent);\n  });\n\n  const canvasWidthInUnits = getWidth(sourceDataExtent);\n  const canvasHeightInUnits = getHeight(sourceDataExtent);\n  const stitchContext = createCanvasContext2D(\n    Math.round(pixelRatio * canvasWidthInUnits / sourceResolution),\n    Math.round(pixelRatio * canvasHeightInUnits / sourceResolution));\n\n  const stitchScale = pixelRatio / sourceResolution;\n\n  sources.forEach(function(src, i, arr) {\n    const xPos = src.extent[0] - sourceDataExtent[0];\n    const yPos = -(src.extent[3] - sourceDataExtent[3]);\n    const srcWidth = getWidth(src.extent);\n    const srcHeight = getHeight(src.extent);\n\n    stitchContext.drawImage(\n      src.image,\n      gutter, gutter,\n      src.image.width - 2 * gutter, src.image.height - 2 * gutter,\n      xPos * stitchScale, yPos * stitchScale,\n      srcWidth * stitchScale, srcHeight * stitchScale);\n  });\n\n  const targetTopLeft = getTopLeft(targetExtent);\n\n  triangulation.getTriangles().forEach(function(triangle, i, arr) {\n    /* Calculate affine transform (src -> dst)\n     * Resulting matrix can be used to transform coordinate\n     * from `sourceProjection` to destination pixels.\n     *\n     * To optimize number of context calls and increase numerical stability,\n     * we also do the following operations:\n     * trans(-topLeftExtentCorner), scale(1 / targetResolution), scale(1, -1)\n     * here before solving the linear system so [ui, vi] are pixel coordinates.\n     *\n     * Src points: xi, yi\n     * Dst points: ui, vi\n     * Affine coefficients: aij\n     *\n     * | x0 y0 1  0  0 0 |   |a00|   |u0|\n     * | x1 y1 1  0  0 0 |   |a01|   |u1|\n     * | x2 y2 1  0  0 0 | x |a02| = |u2|\n     * |  0  0 0 x0 y0 1 |   |a10|   |v0|\n     * |  0  0 0 x1 y1 1 |   |a11|   |v1|\n     * |  0  0 0 x2 y2 1 |   |a12|   |v2|\n     */\n    const source = triangle.source;\n    const target = triangle.target;\n    let x0 = source[0][0], y0 = source[0][1];\n    let x1 = source[1][0], y1 = source[1][1];\n    let x2 = source[2][0], y2 = source[2][1];\n    const u0 = (target[0][0] - targetTopLeft[0]) / targetResolution;\n    const v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;\n    const u1 = (target[1][0] - targetTopLeft[0]) / targetResolution;\n    const v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;\n    const u2 = (target[2][0] - targetTopLeft[0]) / targetResolution;\n    const v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;\n\n    // Shift all the source points to improve numerical stability\n    // of all the subsequent calculations. The [x0, y0] is used here.\n    // This is also used to simplify the linear system.\n    const sourceNumericalShiftX = x0;\n    const sourceNumericalShiftY = y0;\n    x0 = 0;\n    y0 = 0;\n    x1 -= sourceNumericalShiftX;\n    y1 -= sourceNumericalShiftY;\n    x2 -= sourceNumericalShiftX;\n    y2 -= sourceNumericalShiftY;\n\n    const augmentedMatrix = [\n      [x1, y1, 0, 0, u1 - u0],\n      [x2, y2, 0, 0, u2 - u0],\n      [0, 0, x1, y1, v1 - v0],\n      [0, 0, x2, y2, v2 - v0]\n    ];\n    const affineCoefs = solveLinearSystem(augmentedMatrix);\n    if (!affineCoefs) {\n      return;\n    }\n\n    context.save();\n    context.beginPath();\n    const centroidX = (u0 + u1 + u2) / 3;\n    const centroidY = (v0 + v1 + v2) / 3;\n    const p0 = enlargeClipPoint(centroidX, centroidY, u0, v0);\n    const p1 = enlargeClipPoint(centroidX, centroidY, u1, v1);\n    const p2 = enlargeClipPoint(centroidX, centroidY, u2, v2);\n\n    context.moveTo(p1[0], p1[1]);\n    context.lineTo(p0[0], p0[1]);\n    context.lineTo(p2[0], p2[1]);\n    context.clip();\n\n    context.transform(\n      affineCoefs[0], affineCoefs[2], affineCoefs[1], affineCoefs[3], u0, v0);\n\n    context.translate(sourceDataExtent[0] - sourceNumericalShiftX,\n      sourceDataExtent[3] - sourceNumericalShiftY);\n\n    context.scale(sourceResolution / pixelRatio,\n      -sourceResolution / pixelRatio);\n\n    context.drawImage(stitchContext.canvas, 0, 0);\n    context.restore();\n  });\n\n  if (opt_renderEdges) {\n    context.save();\n\n    context.strokeStyle = 'black';\n    context.lineWidth = 1;\n\n    triangulation.getTriangles().forEach(function(triangle, i, arr) {\n      const target = triangle.target;\n      const u0 = (target[0][0] - targetTopLeft[0]) / targetResolution;\n      const v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;\n      const u1 = (target[1][0] - targetTopLeft[0]) / targetResolution;\n      const v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;\n      const u2 = (target[2][0] - targetTopLeft[0]) / targetResolution;\n      const v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;\n\n      context.beginPath();\n      context.moveTo(u1, v1);\n      context.lineTo(u0, v0);\n      context.lineTo(u2, v2);\n      context.closePath();\n      context.stroke();\n    });\n\n    context.restore();\n  }\n  return 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