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import clipRectangle from "../clip/rectangle.js";
import identity from "../identity.js";
import {transformer} from "../transform.js";
import {fitExtent, fitSize, fitWidth, fitHeight} from "./fit.js";
import {cos, degrees, radians, sin} from "../math.js";
export default function() {
var k = 1, tx = 0, ty = 0, sx = 1, sy = 1, // scale, translate and reflect
alpha = 0, ca, sa, // angle
x0 = null, y0, x1, y1, // clip extent
kx = 1, ky = 1,
transform = transformer({
point: function(x, y) {
var p = projection([x, y])
this.stream.point(p[0], p[1]);
}
}),
postclip = identity,
cache,
cacheStream;
function reset() {
kx = k * sx;
ky = k * sy;
cache = cacheStream = null;
return projection;
}
function projection (p) {
var x = p[0] * kx, y = p[1] * ky;
if (alpha) {
var t = y * ca - x * sa;
x = x * ca + y * sa;
y = t;
}
return [x + tx, y + ty];
}
projection.invert = function(p) {
var x = p[0] - tx, y = p[1] - ty;
if (alpha) {
var t = y * ca + x * sa;
x = x * ca - y * sa;
y = t;
}
return [x / kx, y / ky];
};
projection.stream = function(stream) {
return cache && cacheStream === stream ? cache : cache = transform(postclip(cacheStream = stream));
};
projection.postclip = function(_) {
return arguments.length ? (postclip = _, x0 = y0 = x1 = y1 = null, reset()) : postclip;
};
projection.clipExtent = function(_) {
return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity) : clipRectangle(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
};
projection.scale = function(_) {
return arguments.length ? (k = +_, reset()) : k;
};
projection.translate = function(_) {
return arguments.length ? (tx = +_[0], ty = +_[1], reset()) : [tx, ty];
}
projection.angle = function(_) {
return arguments.length ? (alpha = _ % 360 * radians, sa = sin(alpha), ca = cos(alpha), reset()) : alpha * degrees;
};
projection.reflectX = function(_) {
return arguments.length ? (sx = _ ? -1 : 1, reset()) : sx < 0;
};
projection.reflectY = function(_) {
return arguments.length ? (sy = _ ? -1 : 1, reset()) : sy < 0;
};
projection.fitExtent = function(extent, object) {
return fitExtent(projection, extent, object);
};
projection.fitSize = function(size, object) {
return fitSize(projection, size, object);
};
projection.fitWidth = function(width, object) {
return fitWidth(projection, width, object);
};
projection.fitHeight = function(height, object) {
return fitHeight(projection, height, object);
};
return projection;
}