js-draw
Version:
Draw pictures using a pen, touchscreen, or mouse! JS-draw is a drawing library for JavaScript and TypeScript.
72 lines (71 loc) • 2.68 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.makeLineBuilder = void 0;
const math_1 = require("@js-draw/math");
const RenderablePathSpec_1 = require("../../rendering/RenderablePathSpec");
const Stroke_1 = __importDefault(require("../Stroke"));
const makeSnapToGridAutocorrect_1 = __importDefault(require("./autocorrect/makeSnapToGridAutocorrect"));
/**
* Creates a stroke builder that generates filled lines.
*
* Example:
* [[include:doc-pages/inline-examples/changing-pen-types.md]]
*/
exports.makeLineBuilder = (0, makeSnapToGridAutocorrect_1.default)((initialPoint, viewport) => {
return new LineBuilder(initialPoint, viewport);
});
class LineBuilder {
constructor(startPoint, viewport) {
this.startPoint = startPoint;
this.viewport = viewport;
this.endPoint = startPoint;
}
getBBox() {
const preview = this.buildPreview();
return preview.getBBox();
}
buildPreview() {
const startPoint = this.startPoint.pos;
const endPoint = this.endPoint.pos;
const toEnd = endPoint.minus(startPoint).normalized();
const startSize = this.startPoint.width / 2;
const endSize = this.endPoint.width / 2;
const lineNormal = toEnd.orthog();
const scaledStartNormal = lineNormal.times(startSize);
const scaledEndNormal = lineNormal.times(endSize);
const strokeStartPoint = startPoint.minus(scaledStartNormal);
const path = new math_1.Path(strokeStartPoint, [
{
kind: math_1.PathCommandType.LineTo,
point: startPoint.plus(scaledStartNormal),
},
{
kind: math_1.PathCommandType.LineTo,
point: endPoint.plus(scaledEndNormal),
},
{
kind: math_1.PathCommandType.LineTo,
point: endPoint.minus(scaledEndNormal),
},
{
kind: math_1.PathCommandType.LineTo,
point: startPoint.minus(scaledStartNormal),
},
]).mapPoints((point) => this.viewport.roundPoint(point));
const preview = new Stroke_1.default([(0, RenderablePathSpec_1.pathToRenderable)(path, { fill: this.startPoint.color })]);
return preview;
}
build() {
return this.buildPreview();
}
preview(renderer) {
this.buildPreview().render(renderer);
}
addPoint(point) {
this.endPoint = point;
}
}
exports.default = LineBuilder;