1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715
#![doc(html_logo_url = "https://nical.github.io/lyon-doc/lyon-logo.svg")] #![deny(bare_trait_objects)] // TODO: Tessellation pipeline diagram needs to be updated. //! Tessellation of 2D fill and stroke operations. //! //! <svg viewBox="0 0 600.0 300.0" height="300" width="600"> //! <g transform="translate(0,-752.36216)"> //! <path style="fill:none;stroke:#ff9955;" d="m 346.4,790.7 186.8,11.2 -213.6,25.9 196.8,12.7 -185.1,41.4 192.4,24.4 -205.5,10.3 194.1,33.4 -97.3,25.5 -96.9,-58.9"/> //! <path style="fill:#ffb380;stroke:none;" d="m 59.1,965.3 -15.1,-48.7 13.0,-34.4 -11.5,-54.2 26.7,-37.1 73.2,-19.2 114.4,30.4 -17.0,38.0 1.1,15.3 13.4,-8.1 14.8,6.8 -5.2,48.2 -16.8,4.8 -11.4,43.5 -40.4,29.9 -31.3,-3.0 0,28.2 19.0,8.3 -44.2,19.0 -10.6,-25.1 9.9,-3.8 0,-28.2 z"/> //! <path style="fill:#de8787;stroke:none;" d="m 106.4,853.1 2.2,67.9 49.6,0.7 13.7,-22.9 -20.6,-3.8 -4.5,-44.2 -17.5,-13.7 z"/> //! <path style="fill:#a02c2c;stroke:none;" d="m 108.74845,940.94089 61.08369,3.05419 -13.74383,15.27092 -33.59604,-3.05418 z"/> //! <path style="fill:#784421;stroke:none;" d="m 176.93475,845.6345 20.51653,4.85918 -5.39908,30.7748 -12.68786,-1.88968 z"/> //! <path style="fill:#784421;stroke:none;" d="m 78.4,882.0 9.4,-3.2 3.7,-30.7 -13.2,8.6 z"/> //! <path style="fill:none;stroke:#ff9955;stroke-linecap:round;stroke-linejoin:round;" d="m 333.2,965.3 -15.1,-48.7 13.0,-34.4 -11.5,-54.2 26.7,-37.1 73.2,-19.2 114.4,30.4 -17.0,38.0 1.2,15.3 13.2,-8.0 14.8,6.8 -5.2,48.2 -16.8,4.8 -11.4,43.5 -40.4,29.9 -31.3,-3.0 0,28.2 19.0,8.3 -44.2,19.0 -10.6,-25.1 9.9,-3.8 0,-28.2 z"/> //! <path style="fill:none;stroke:#de8787;stroke-linecap:round;stroke-linejoin:round;" d="m 380.5,853.1 2.2,67.9 49.6,0.7 13.7,-22.9 -20.6,-3.8 -4.5,-44.2 -17.5,-13.7 z"/> //! <path style="fill:none;stroke:#a02c2c;stroke-linecap:round;stroke-linejoin:round;" d="m 382.8,940.9 61.0,3.0 -13.7,15.2 -33.5,-3.0 z"/> //! <path style="fill:none;stroke:#803300;stroke-linecap:round;stroke-linejoin:round;" d="m 451.0,845.6 20.5,4.8 -5.3,30.7 -12.6,-1.8 z"/> //! <path style="fill:none;stroke:#803300;stroke-linecap:round;stroke-linejoin:round;" d="m 352.5,882.0 9.4,-3.2 3.7,-30.7 -13.2,8.6 z"/> //! <path style="fill:none;stroke:#803300;stroke-linecap:round;stroke-linejoin:round;" d="m 352.5,856.4 9.3,22.2"/> //! <path style="fill:none;stroke:#de8787;stroke-linecap:round;stroke-linejoin:round;" d="m 380.8,853.3 40.2,-2.5 -38.3,70.1 42.6,-25.9 6.6,26.5"/> //! <path style="fill:none;stroke:#803300;stroke-linecap:round;stroke-linejoin:round;" d="m 471.4,850.4 -17.6,28.6"/> //! <path style="fill:none;stroke:#a02c2c;stroke-linecap:round;stroke-linejoin:round;" d="m 443.3,943.9 -46.7,12.2"/> //! <path style="fill:none;stroke:#ff9955;stroke-linecap:round;stroke-linejoin:round;" d="m 540.7,902.0 -22.5,-46.9 5.7,51.7"/> //! <path style="fill:none;stroke:#ff9955;stroke-linecap:round;stroke-linejoin:round;" d="m 512.2,950.2 -71.0,27.1 -26.1,-1.7 25.3,30.1 -25.1,-1.7 44.0,10.3 -53.8,-6.1"/> //! <path style="fill:none;stroke:#ff9955;stroke-linecap:round;stroke-linejoin:round;" d="m 518.5,8.3 27.5,-1.2"/> //! </g> //! </svg> //! //! This crate is reexported in [lyon](https://docs.rs/lyon/). //! //! ## Overview //! //! The most interesting types and traits of this crate are: //! //! * [FillTessellator](struct.FillTessellator.html) - Tessellator for complex path fill operations. //! * [StrokeTessellator](struct.StrokeTessellator.html) - Tessellator for complex path stroke operations. //! * [`GeometryBuilder`](geometry_builder/trait.GeometryBuilder.html) - (See the documentation of the //! [geometry_builder module](geometry_builder/index.html)) which the above two are built on. This trait //! provides an interface for types that help with building and assembling the vertices and triangles that //! form the tessellation, usually in the form of arbitrary vertex and index buffers. //! * The various specialized tessellators in the [`basic_shapes`](basic_shapes/index.html) modules. //! //! ## The tessellation pipeline //! //! <svg xmlns="http://www.w3.org/2000/svg" width="280mm" height="42mm" viewBox="0 0 280 42"> //! <defs> //! <marker id="e" orient="auto" overflow="visible"> //! <path fill="#59f" fill-rule="evenodd" stroke="#59f" stroke-width=".532" d="M-4 0l-2 2 7-2-7-2z"/> //! </marker> //! <marker id="d" orient="auto" overflow="visible"> //! <path fill-rule="evenodd" stroke="#000" stroke-width=".532" d="M-4 0l-2 2 7-2-7-2z"/> //! </marker> //! <marker id="c" orient="auto" overflow="visible"> //! <path fill="#59f" fill-rule="evenodd" stroke="#59f" stroke-width=".532" d="M-4 0l-2 2 7-2-7-2z"/> //! </marker> //! <marker id="b" orient="auto" overflow="visible"> //! <path fill-rule="evenodd" stroke="#000" stroke-width=".532" d="M-4 0l-2 2 7-2-7-2z"/> //! </marker> //! <marker id="a" orient="auto" overflow="visible"> //! <path fill-rule="evenodd" stroke="#000" stroke-width=".532" d="M-4 0l-2 2 7-2-7-2z"/> //! </marker> //! </defs> //! <path fill="#fff" stroke="#000" stroke-opacity=".56" stroke-width=".26" stroke-miterlimit="4.27" d="M39.55 17.37h15.8l2.15-1.7 2.06 1.7h15.36V38.8H39.55zM194.65 31.3h21.58l2.1-1.83 2.04 1.82h35.07v7.07h-60.8zM77.7 19.5h54.6l3.3-2.58 3.17 2.57h52.56v19H77.7z" color="#000" overflow="visible" stroke-linecap="round" stroke-linejoin="round"/> //! <g color="#000"> //! <path fill="#80b3ff" d="M194.6 20.37h50.65v8.73H194.6z" overflow="visible"/> //! <path fill="#d5f6ff" d="M194.6 19.3h50.65v8.74H194.6z" overflow="visible"/> //! </g> //! <g color="#000"> //! <path fill="#2a7fff" d="M221.6 5.74h21.56v8.73H221.6z" overflow="visible"/> //! <path fill="#d5f6ff" d="M221.6 4.68h21.56v8.73H221.6z" overflow="visible"/> //! </g> //! <g color="#000"> //! <path fill="#2a7fff" d="M154.38 5.74h47.4v8.73h-47.4z" overflow="visible"/> //! <path fill="#d5f6ff" d="M154.38 4.68h47.4v8.73h-47.4z" overflow="visible"/> //! </g> //! <g color="#000"> //! <path fill="#2a7fff" d="M91.94 5.74h39.34v8.73H91.94z" overflow="visible"/> //! <path fill="#d5f6ff" d="M91.94 4.68h39.34v8.73H91.94z" overflow="visible"/> //! </g> //! <g color="#000"> //! <path fill="#2a7fff" d="M3.04 5.74H75.2v8.73H3.03z" overflow="visible"/> //! <path fill="#d5f6ff" d="M3.04 4.68H75.2v8.73H3.03z" overflow="visible"/> //! </g> //! <text x="93.73" y="266.09" stroke-width=".26" style="line-height:6.61458302px" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" transform="translate(0 -255)"> //! <tspan x="93.73" y="266.09">FillTessellator</tspan> //! </text> //! <text x="155.37" y="265.58" stroke-width=".26" style="line-height:6.61458302px" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" transform="translate(0 -255)"> //! <tspan x="155.37" y="265.58">GeometryBuilder</tspan> //! </text> //! <text x="223.1" y="266.02" stroke-width=".26" style="line-height:6.61458302px" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" transform="translate(0 -255)"> //! <tspan x="223.1" y="266.02">output</tspan> //! </text> //! <text x="196.17" y="280.9" stroke-width=".26" style="line-height:6.61458302px" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" transform="translate(0 -255)"> //! <tspan x="196.17" y="280.9">VertexConstructor</tspan> //! </text> //! <text x="5.13" y="266.09" stroke-width=".26" style="line-height:6.61458302px" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" transform="translate(0 -255)"> //! <tspan x="5.13" y="266.09">Iterator<PathEvent></tspan> //! </text> //! <text x="79.79" y="282.2" stroke-width=".26" style="line-height:6.61458302px" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" transform="translate(0 -255)"> //! <tspan x="79.79" y="282.2" fill="navy" font-size="4.23">builder.add_vertex(FillVertex) -> VertexId;</tspan><tspan x="79.79" y="289.09" fill="navy" font-size="4.23">builder.add_triangle(VertexId, <tspan stroke-width=".07" style="line-height:1.75010836px;font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;text-transform:none;text-orientation:mixed;shape-padding:0" white-space="normal">VertexId, VertexId);</tspan></tspan> //! </text> //! <path fill="none" stroke="#000" stroke-width=".3" stroke-miterlimit="4.4" d="M76.94 265l13.64-.1" marker-end="url(#a)" transform="translate(0 -255)"/> //! <path fill="none" stroke="#000" stroke-width=".3" stroke-miterlimit="4.4" d="M132.86 265l19.55-.1" marker-end="url(#b)" transform="translate(0 -255)"/> //! <path fill="#59f" fill-rule="evenodd" stroke="#59f" stroke-width=".3" stroke-miterlimit="4.4" d="M203.38 264.53l8.27 8.26" marker-end="url(#c)" transform="translate(0 -255)"/> //! <path fill="none" stroke="#000" stroke-width=".3" stroke-miterlimit="4.4" d="M203.38 264.53l16 .06" marker-end="url(#d)" transform="translate(0 -255)"/> //! <text x="196.69" y="291.41" stroke-width=".26" style="line-height:6.61458302px" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" transform="translate(0 -255)"> //! <tspan x="196.69" y="291.41" fill="navy" font-size="4.23">FillVertex -> CustomVertex</tspan> //! </text> //! <path fill="#59f" fill-rule="evenodd" stroke="#59f" stroke-width=".3" stroke-miterlimit="4.4" d="M212.97 272.98l6.75-6.5" marker-end="url(#e)" transform="translate(0 -255)"/> //! <g fill="none" stroke="#000" stroke-width=".26"> //! <path d="M7.2 30.1l2.98 1.72h3.24l1.78-1.8 2.62-.75 2.08 1.83-1.6 2.87-5.64 1.54-3.5-1.62zM32.6 30.1l-3 1.72H26.4l-1.78-1.8-2.62-.75-2.08 1.83 1.6 2.87 5.64 1.54 3.5-1.62zM15 20.67l-.5 4.42 1.34 1 1.63-1.57-1.06-4.03zM24.53 20.67l.5 4.42-1.33 1-1.63-1.57 1.06-4.03z"/> //! </g> //! <path fill="#b7c8c4" fill-rule="evenodd" stroke="#000" stroke-width=".15" d="M251.68 19.5l2.98 1.74h3.23l1.78-1.8 2.62-.75 2.07 1.82-1.6 2.87-5.63 1.53-3.5-1.63z" stroke-linecap="round" stroke-linejoin="round"/> //! <path fill="#b7c8c4" fill-rule="evenodd" stroke="#000" stroke-width=".15" d="M277.07 19.5l-2.98 1.74h-3.24l-1.8-1.8-2.6-.75-2.1 1.82L266 23.4l5.63 1.53 3.5-1.63zM259.48 10.08l-.5 4.42 1.33 1 1.65-1.55-1.07-4.03zM269 10.08l.52 4.42-1.34 1-1.64-1.55 1.07-4.03z" stroke-linecap="round" stroke-linejoin="round"/> //! <path fill="none" stroke="#000" stroke-width=".15" d="M258.97 14.5l2.98-.55-2.47-3.87M266.54 13.95l2.98.55-1.9-4.58M254.66 21.24l-1 2.06 4.23-2.06-.76 3.7 2.54-5.5 3.1 3.95-.48-4.7M275.1 23.3l-1-2.06-2.5 3.7-.74-3.7-4.4-2.55-.48 4.7 4.88-2.16" stroke-linecap="round" stroke-linejoin="round"/> //! <text x="43.5" y="277.68" stroke-width=".26" style="line-height:6.61458349px" font-size="5.29" font-family="Sans" letter-spacing="0" word-spacing="0" transform="translate(0 -255)"> //! <tspan x="43.5" y="277.68" fill="navy" font-size="3.88">MoveTo(Point)</tspan><tspan x="43.5" y="284.66" fill="navy" font-size="3.88">LineTo(Point)</tspan><tspan x="43.5" y="291.65" fill="navy" font-size="3.88">Close</tspan> //! </text> //! </svg> //! //! The figure above shows a simplified summary of each step of the fill tessellation pipeline. //! //! ### The input: iterators //! //! The path tessellators are not tied to a particular data structure. Instead they consume //! iterators of flattened path events. //! A [Path struct](https://docs.rs/lyon_path/*/lyon_path/struct.Path.html) in the crate //! [lyon_path](https://docs.rs/lyon_path/*/lyon_path/) is provided for convenience //! (but is optional). //! //! ### The output: geometry builders //! //! The tessellators are parametrized over a type implementing the //! [GeometryBuilder trait](geometry_builder/trait.GeometryBuilder.html). //! This trait provides some simple methods to add vertices and triangles, without enforcing //! any particular representation for the resulting geometry. This is important because each //! application will usually want to work with its own vertex type tailored a certain rendering //! model. //! //! Applications can implement the ```GeometryBuilder<Point>``` trait in order to //! generate vertex buffers and index buffers with custom vertex types. //! //! The structs [VertexBuffers](geometry_builder/struct.VertexBuffers.html) and //! [geometry_buider::BuffersBuilder](geometry_builder/struct.BuffersBuilder.html) are provided //! for convenience. `VertexBuffers<T>` is contains a `Vec<T>` for the vertices and a `Vec<u16>` //! for the indices. //! //! `BuffersBuilder` is generic over a `VertexConstructor<InputVertex, OutputVertex>` trait which //! creates the application's output vertices from the tessellator input vertices (either `FillVertex` //! or `StrokeVertex`). //! //! ### Rendering the tessellated geometry //! //! The tessellators produce geometry in the form of vertex and index buffers which are expected //! to be rendered using the equivalent of OpenGL's `glDrawElements` with mode `GL_TRIANGLES` available //! under various names in the different graphics APIs. //! There is an [example](https://github.com/nical/lyon/tree/master/examples/wgpu) showing how //! it can be done with wgpu. //! //! ### Flattening and tolerance //! //! Most tessellators in this crate currently operate on flattened paths (paths or shapes represented //! by sequences of line segments). when paths contain bézier curves or arcs, the latter need to be //! approximated with sequences of line segments. This approximation depends on a `tolerance` parameter //! which represents the maximum distance between a curve and its flattened approximation. //! //! More explanation about flattening and tolerance in the [lyon_geom crate](https://docs.rs/lyon_geom/#flattening). //! //! ## Examples //! //! - [Tessellating path fills](fill/struct.FillTessellator.html#examples). //! - [Tessellating path strokes](path_stroke/struct.StrokeTessellator.html#examples). //! - [Generating custom vertices](geometry_builder/index.html#generating-custom-vertices). //! - [Generating completely custom output](geometry_builder/index.html#generating-a-completely-custom-output). //! - [Writing a tessellator](geometry_builder/index.html#writing-a-tessellator). //! #![allow(dead_code)] //#![allow(needless_return, new_without_default_derive)] // clippy pub use lyon_path as path; #[cfg(test)] use lyon_extra as extra; #[cfg(feature = "serialization")] #[macro_use] pub extern crate serde; pub mod basic_shapes; pub mod geometry_builder; mod event_queue; mod fill; mod stroke; mod math_utils; mod monotone; #[cfg(test)] mod earcut_tests; #[cfg(test)] mod fill_tests; #[cfg(test)] mod fuzz_tests; pub use crate::path::math; pub use crate::path::geom; #[doc(inline)] pub use crate::event_queue::*; #[doc(inline)] pub use crate::fill::*; #[doc(inline)] pub use crate::stroke::*; #[doc(inline)] pub use crate::geometry_builder::{ GeometryBuilder, FillGeometryBuilder, StrokeGeometryBuilder, GeometryReceiver, FillVertexConstructor, StrokeVertexConstructor, BasicVertexConstructor, VertexBuffers, BuffersBuilder, Count, GeometryBuilderError, }; pub use crate::path::FillRule; use crate::path::EndpointId; use std::ops::{Add, Sub}; use std::u32; /// The fill tessellator's result type. pub type TessellationResult = Result<Count, TessellationError>; /// Describes an unexpected error happening during tessellation. /// /// If you run into one of these, please consider /// [filing an issue](https://github.com/nical/lyon/issues/new). #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)] pub enum InternalError { IncorrectActiveEdgeOrder(i16), InsufficientNumberOfSpans, InsufficientNumberOfEdges, MergeVertexOutside, InvalidNumberOfEdgesBelowVertex, ErrorCode(i16), } /// The fill tessellator's error enumeration. #[derive(Clone, Debug, PartialEq)] pub enum TessellationError { UnsupportedParamater, InvalidVertex, TooManyVertices, Internal(InternalError) } impl From<GeometryBuilderError> for TessellationError { fn from(e: GeometryBuilderError) -> Self { match e { GeometryBuilderError::InvalidVertex => TessellationError::InvalidVertex, GeometryBuilderError::TooManyVertices => TessellationError::TooManyVertices, } } } impl From<InternalError> for TessellationError { fn from(e: InternalError) -> Self { TessellationError::Internal(e) } } /// Left or right. #[derive(Copy, Clone, Debug, PartialEq)] #[cfg_attr(feature = "serialization", derive(Serialize, Deserialize))] pub enum Side { Left, Right, } impl Side { pub fn opposite(self) -> Self { match self { Side::Left => Side::Right, Side::Right => Side::Left, } } pub fn is_left(self) -> bool { self == Side::Left } pub fn is_right(self) -> bool { self == Side::Right } } /// Before or After. Used to describe position relative to a join. #[derive(Copy, Clone, Debug, PartialEq)] #[cfg_attr(feature = "serialization", derive(Serialize, Deserialize))] pub enum Order { Before, After, } impl Order { pub fn opposite(self) -> Self { match self { Order::Before => Order::After, Order::After => Order::Before, } } pub fn is_before(self) -> bool { self == Order::Before } pub fn is_after(self) -> bool { self == Order::After } } pub use fill::FillAttributes; pub use stroke::StrokeAttributes; /// Where a vertex produced by a tessellator comes from in the original path. /// /// In most cases, vertices come directly from an endpoint. However, Curve /// approximations and self-intersections can introduce vertices that are on /// one or several edges, at a certain parameter `t` between the two endpoints /// of the edge. #[derive(Copy, Clone, Debug, PartialEq)] pub enum VertexSource { Endpoint { id: EndpointId }, Edge { from: EndpointId, to: EndpointId, t: f32 }, } /// Line cap as defined by the SVG specification. /// /// See: https://svgwg.org/specs/strokes/#StrokeLinecapProperty /// /// <svg viewBox="0 0 400 399.99998" height="400" width="400"> /// <g transform="translate(0,-652.36229)"> /// <path style="opacity:1;fill:#80b3ff;stroke:#000000;stroke-width:1;stroke-linejoin:round;" d="m 240,983 a 30,30 0 0 1 -25,-15 30,30 0 0 1 0,-30.00001 30,30 0 0 1 25.98076,-15 l 0,30 z"/> /// <path style="fill:#80b3ff;stroke:#000000;stroke-width:1px;stroke-linecap:butt;" d="m 390,782.6 -150,0 0,-60 150,0.5"/> /// <circle style="opacity:1;fill:#ff7f2a;stroke:#000000;stroke-width:1;stroke-linejoin:round;" r="10" cy="752.89227" cx="240.86813"/> /// <path style="fill:none;stroke:#000000;stroke-width:1px;stroke-linejoin:round;" d="m 240,722.6 150,60"/> /// <path style="fill:#80b3ff;stroke:#000000;stroke-width:1px;stroke-linecap:butt;" d="m 390,882 -180,0 0,-60 180,0.4"/> /// <circle style="opacity:1;fill:#ff7f2a;stroke:#000000;stroke-width:1;stroke-linejoin:round;" cx="239.86813" cy="852.20868" r="10" /> /// <path style="fill:none;stroke:#000000;stroke-width:1px;stroke-linejoin:round;" d="m 210.1,822.3 180,60"/> /// <path style="fill:#80b3ff;stroke:#000000;stroke-width:1px;stroke-linecap:butt;" d="m 390,983 -150,0 0,-60 150,0.4"/> /// <circle style="opacity:1;fill:#ff7f2a;stroke:#000000;stroke-width:1;stroke-linejoin:round;" cx="239.86813" cy="953.39734" r="10" /> /// <path style="fill:none;stroke:#000000;stroke-width:1px;stroke-linejoin:round;" d="m 390,983 -150,-60 L 210,953 l 30,30 -21.5,-9.5 L 210,953 218.3,932.5 240,923.4"/> /// <text y="757.61273" x="183.65314" style="font-style:normal;font-weight:normal;font-size:20px;line-height:125%;font-family:Sans;text-align:end;text-anchor:end;fill:#000000;stroke:none;"> /// <tspan y="757.61273" x="183.65314">LineCap::Butt</tspan> /// <tspan y="857.61273" x="183.65314">LineCap::Square</tspan> /// <tspan y="957.61273" x="183.65314">LineCap::Round</tspan> /// </text> /// </g> /// </svg> #[derive(Copy, Clone, Debug, PartialEq)] #[cfg_attr(feature = "serialization", derive(Serialize, Deserialize))] pub enum LineCap { /// The stroke for each sub-path does not extend beyond its two endpoints. /// A zero length sub-path will therefore not have any stroke. Butt, /// At the end of each sub-path, the shape representing the stroke will be /// extended by a rectangle with the same width as the stroke width and /// whose length is half of the stroke width. If a sub-path has zero length, /// then the resulting effect is that the stroke for that sub-path consists /// solely of a square with side length equal to the stroke width, centered /// at the sub-path's point. Square, /// At each end of each sub-path, the shape representing the stroke will be extended /// by a half circle with a radius equal to the stroke width. /// If a sub-path has zero length, then the resulting effect is that the stroke for /// that sub-path consists solely of a full circle centered at the sub-path's point. Round, } /// Line join as defined by the SVG specification. /// /// See: https://svgwg.org/specs/strokes/#StrokeLinejoinProperty #[derive(Copy, Clone, Debug, PartialEq)] #[cfg_attr(feature = "serialization", derive(Serialize, Deserialize))] pub enum LineJoin { /// A sharp corner is to be used to join path segments. Miter, /// Same as a miter join, but if the miter limit is exceeded, /// the miter is clipped at a miter length equal to the miter limit value /// multiplied by the stroke width. MiterClip, /// A round corner is to be used to join path segments. Round, /// A bevelled corner is to be used to join path segments. /// The bevel shape is a triangle that fills the area between the two stroked /// segments. Bevel, } /// Vertical or Horizontal. #[derive(Copy, Clone, Debug, PartialEq)] #[cfg_attr(feature = "serialization", derive(Serialize, Deserialize))] pub enum Orientation { Horizontal, Vertical, } /// Parameters for the tessellator. #[derive(Copy, Clone, Debug, PartialEq)] #[cfg_attr(feature = "serialization", derive(Serialize, Deserialize))] pub struct StrokeOptions { /// What cap to use at the start of each sub-path. /// /// Default value: `LineCap::Butt`. pub start_cap: LineCap, /// What cap to use at the end of each sub-path. /// /// Default value: `LineCap::Butt`. pub end_cap: LineCap, /// See the SVG specification. /// /// Default value: `LineJoin::Miter`. pub line_join: LineJoin, /// Line width /// /// Default value: `StrokeOptions::DEFAULT_LINE_WIDTH`. pub line_width: f32, /// See the SVG specification. /// /// Must be greater than or equal to 1.0. /// Default value: `StrokeOptions::DEFAULT_MITER_LIMIT`. pub miter_limit: f32, /// Maximum allowed distance to the path when building an approximation. /// /// See [Flattening and tolerance](index.html#flattening-and-tolerance). /// Default value: `StrokeOptions::DEFAULT_TOLERANCE`. pub tolerance: f32, /// Apply line width /// /// When set to false, the generated vertices will all be positioned in the centre /// of the line. The width can be applied later on (eg in a vertex shader) by adding /// the vertex normal multiplied by the line with to each vertex position. /// /// Default value: `true`. pub apply_line_width: bool, // To be able to add fields without making it a breaking change, add an empty private field // which makes it impossible to create a StrokeOptions without calling the constructor. _private: (), } impl StrokeOptions { /// Minimum miter limit as defined by the SVG specification. /// /// See [StrokeMiterLimitProperty](https://svgwg.org/specs/strokes/#StrokeMiterlimitProperty) pub const MINIMUM_MITER_LIMIT: f32 = 1.0; /// Default miter limit as defined by the SVG specification. /// /// See [StrokeMiterLimitProperty](https://svgwg.org/specs/strokes/#StrokeMiterlimitProperty) pub const DEFAULT_MITER_LIMIT: f32 = 4.0; pub const DEFAULT_LINE_CAP: LineCap = LineCap::Butt; pub const DEFAULT_LINE_JOIN: LineJoin = LineJoin::Miter; pub const DEFAULT_LINE_WIDTH: f32 = 1.0; pub const DEFAULT_TOLERANCE: f32 = 0.1; pub const DEFAULT: Self = StrokeOptions { start_cap: Self::DEFAULT_LINE_CAP, end_cap: Self::DEFAULT_LINE_CAP, line_join: Self::DEFAULT_LINE_JOIN, line_width: Self::DEFAULT_LINE_WIDTH, miter_limit: Self::DEFAULT_MITER_LIMIT, tolerance: Self::DEFAULT_TOLERANCE, apply_line_width: true, _private: (), }; #[inline] pub fn tolerance(tolerance: f32) -> Self { Self::DEFAULT.with_tolerance(tolerance) } #[inline] pub fn with_tolerance(mut self, tolerance: f32) -> Self { self.tolerance = tolerance; self } #[inline] pub fn with_line_cap(mut self, cap: LineCap) -> Self { self.start_cap = cap; self.end_cap = cap; self } #[inline] pub fn with_start_cap(mut self, cap: LineCap) -> Self { self.start_cap = cap; self } #[inline] pub fn with_end_cap(mut self, cap: LineCap) -> Self { self.end_cap = cap; self } #[inline] pub fn with_line_join(mut self, join: LineJoin) -> Self { self.line_join = join; self } #[inline] pub fn with_line_width(mut self, width: f32) -> Self { self.line_width = width; self } #[inline] pub fn with_miter_limit(mut self, limit: f32) -> Self { assert!(limit >= Self::MINIMUM_MITER_LIMIT); self.miter_limit = limit; self } #[inline] pub fn dont_apply_line_width(mut self) -> Self { self.apply_line_width = false; self } } impl Default for StrokeOptions { fn default() -> Self { Self::DEFAULT } } /// Parameters for the fill tessellator. #[derive(Copy, Clone, Debug, PartialEq)] #[cfg_attr(feature = "serialization", derive(Serialize, Deserialize))] pub struct FillOptions { /// Maximum allowed distance to the path when building an approximation. /// /// See [Flattening and tolerance](index.html#flattening-and-tolerance). /// /// Default value: `FillOptions::DEFAULT_TOLERANCE`. pub tolerance: f32, /// Set the fill rule. /// /// See the [SVG specification](https://www.w3.org/TR/SVG/painting.html#FillRuleProperty). /// Currently, only the `EvenOdd` rule is implemented. /// /// Default value: `EvenOdd`. pub fill_rule: FillRule, /// Whether to perform a vertical or horizontal traversal of the geometry. /// /// Default value: `Vertical`. pub sweep_orientation: Orientation, /// A fast path to avoid some expensive operations if the path is known to /// not have any self-intersections. /// /// Do not set this to `true` if the path may have intersecting edges else /// the tessellator may panic or produce incorrect results. In doubt, do not /// change the default value. /// /// Default value: `false`. pub handle_intersections: bool, // To be able to add fields without making it a breaking change, add an empty private field // which makes it impossible to create a FillOptions without the calling constructor. _private: (), } impl FillOptions { /// Default flattening tolerance. pub const DEFAULT_TOLERANCE: f32 = 0.1; /// Default Fill rule. pub const DEFAULT_FILL_RULE: FillRule = FillRule::EvenOdd; /// Default orientation. pub const DEFAULT_SWEEP_ORIENTATION: Orientation = Orientation::Vertical; pub const DEFAULT: Self = FillOptions { tolerance: Self::DEFAULT_TOLERANCE, fill_rule: Self::DEFAULT_FILL_RULE, sweep_orientation: Self::DEFAULT_SWEEP_ORIENTATION, handle_intersections: true, _private: (), }; #[inline] pub fn even_odd() -> Self { Self::DEFAULT } #[inline] pub fn tolerance(tolerance: f32) -> Self { Self::DEFAULT.with_tolerance(tolerance) } #[inline] pub fn non_zero() -> Self { let mut options = Self::DEFAULT; options.fill_rule = FillRule::NonZero; options } #[inline] pub fn with_tolerance(mut self, tolerance: f32) -> Self { self.tolerance = tolerance; self } #[inline] pub fn with_fill_rule(mut self, rule: FillRule) -> Self { self.fill_rule = rule; self } #[inline] pub fn with_sweep_orientation(mut self, orientation: Orientation) -> Self { self.sweep_orientation = orientation; self } #[inline] pub fn with_intersections(mut self, intersections: bool) -> Self { self.handle_intersections = intersections; self } } impl Default for FillOptions { fn default() -> Self { Self::DEFAULT } } type Index = u32; /// A virtual vertex offset in a geometry. /// /// The `VertexId`s are only valid between `GeometryBuilder::begin_geometry` and /// `GeometryBuilder::end_geometry`. `GeometryBuilder` implementations typically be translate /// the ids internally so that first `VertexId` after `begin_geometry` is zero. #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)] #[cfg_attr(feature = "serialization", derive(Serialize, Deserialize))] pub struct VertexId(pub Index); impl VertexId { pub const INVALID: VertexId = VertexId(u32::MAX); pub fn offset(&self) -> Index { self.0 } pub fn to_usize(&self) -> usize { self.0 as usize } pub fn from_usize(v: usize) -> Self { VertexId(v as Index) } } impl Add<u32> for VertexId { type Output = Self; fn add(self, rhs: u32) -> Self { VertexId(self.0 + rhs) } } impl Sub<u32> for VertexId { type Output = Self; fn sub(self, rhs: u32) -> Self { VertexId(self.0 - rhs) } } impl From<u16> for VertexId { fn from(v: u16) -> Self { VertexId(v as Index) } } impl From<u32> for VertexId { fn from(v: u32) -> Self { VertexId(v) } } impl From<i32> for VertexId { fn from(v: i32) -> Self { VertexId(v as Index) } } impl From<VertexId> for u16 { fn from(v: VertexId) -> Self { v.0 as u16 } } impl From<VertexId> for u32 { fn from(v: VertexId) -> Self { v.0 } } impl From<VertexId> for i32 { fn from(v: VertexId) -> Self { v.0 as i32 } } impl From<VertexId> for usize { fn from(v: VertexId) -> Self { v.0 as usize } } #[test] fn test_without_miter_limit(){ let expected_limit = 4.0; let stroke_options = StrokeOptions::default(); assert_eq!(expected_limit, stroke_options.miter_limit); } #[test] fn test_with_miter_limit(){ let expected_limit = 3.0; let stroke_options = StrokeOptions::default().with_miter_limit(expected_limit); assert_eq!(expected_limit, stroke_options.miter_limit); } #[test] #[should_panic] fn test_with_invalid_miter_limit(){ let _ = StrokeOptions::default().with_miter_limit(0.0); }