| /* |
| * Copyright 2024 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include <cmath> |
| #include <utility> |
| #include <deque> |
| #include <vector> |
| |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkCubicMap.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkPathMeasure.h" |
| #include "include/core/SkPathTypes.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/private/SkPathRef.h" |
| #include "include/private/base/SkAssert.h" |
| #include "include/utils/SkParsePath.h" |
| #include "src/core/SkGeometry.h" |
| #include "src/core/SkPathPriv.h" |
| #include "tools/viewer/Slide.h" |
| |
| #include "imgui.h" |
| |
| namespace { |
| |
| static constexpr struct PathDesc { |
| const char* fName; |
| const char* fSVGString; |
| } gSamplePaths[] = { |
| { "Arc 1", "M0,0.5 Q0,0 0.5,0 Q1,0 1,0.5"}, |
| { "Arc 2", "M0,0.5 Q0,1 0.5,1 Q1,1 1,0.5 L1.1,0.5 L1.2,0.5 L1.3,0.5 L1.5,0.5"}, |
| { "Pentagon", |
| R"(M10.1192 4.09438C10.7952 3.60324 11.1332 3.35767 11.5027 3.26278C11.829 3.17901 12.1712 3.17901 12.4975 |
| 3.26278C12.867 3.35767 13.205 3.60324 13.881 4.09438L19.6298 8.27108C20.3058 8.76222 20.6437 9.0078 20.8482 |
| 9.32992C21.0287 9.61436 21.1344 9.93978 21.1556 10.276C21.1795 10.6568 21.0504 11.0541 20.7922 11.8488L18.5964 |
| 18.6068C18.3382 19.4015 18.2091 19.7989 17.9659 20.0928C17.7512 20.3524 17.4743 20.5535 17.1611 20.6775C16.8064 |
| 20.818 16.3886 20.818 15.553 20.818H8.44718C7.6116 20.818 7.19381 20.818 6.83908 20.6775C6.52586 20.5535 6.24904 |
| 20.3524 6.0343 20.0928C5.79111 19.7989 5.66201 19.4015 5.4038 18.6068L3.20798 11.8488C2.94977 11.0541 2.82066 |
| 10.6568 2.84462 10.276C2.86577 9.93978 2.97151 9.61436 3.15202 9.32992C3.35645 9.0078 3.69445 8.76222 4.37045 |
| 8.27108L10.1192 4.09438Z)"}, |
| { "Droplet", |
| R"(M12 21.5C13.8565 21.5 15.637 20.7625 16.9497 19.4497C18.2625 18.137 19 16.3565 19 14.5C19 12.5 18 10.6 16 9 |
| C14 7.4 12.5 5 12 2.5C11.5 5 10 7.4 8 9C6 10.6 5 12.5 5 14.5C5 16.3565 5.7375 18.137 7.05025 19.4497 |
| C8.36301 20.7625 10.1435 21.5 12 21.5V21.5Z)"}, |
| { "Shield", |
| R"(M20 6C20 6 19.1843 6 19.0001 6C16.2681 6 13.8871 4.93485 11.9999 3C10.1128 4.93478 7.73199 6 5.00009 6 |
| C4.81589 6 4.00009 6 4.00009 6C4.00009 6 4 8 4 9.16611C4 14.8596 7.3994 19.6436 12 21C16.6006 19.6436 20 14.8596 20 9.16611 |
| C20 8 20 6 20 6Z)"}, |
| { "Spiral", |
| R"(M297,7888.302 L297,7886.302 C297,7885.75 296.552,7885 296,7885 L292,7885 C291.448,7885 291,7885.75 291,7886.302 |
| L291,7892.302 C291,7892.854 291.448,7893 292,7893 L300,7893 C300.552,7893 301,7892.854 301,7892.302 L301,7882.302 |
| C301,7881.75 300.552,7881 300,7881 L288,7881 C287.448,7881 287,7881.75 287,7882.302 L287,7896.302 |
| C287,7896.854 287.448,7897 288,7897 L302,7897 C302.552,7897 303,7897.524 303,7898.076 L303,7898.151 |
| C303,7898.703 302.552,7899 302,7899 L287,7899 C285.896,7899 285,7898.407 285,7897.302 L285,7881.302 |
| C285,7880.197 285.896,7879 287,7879 L301,7879 C302.105,7879 303,7880.197 303,7881.302 L303,7893.302 |
| C303,7894.407 302.105,7895 301,7895 L291,7895 C289.896,7895 289,7894.407 289,7893.302 L289,7885.302 |
| C289,7884.197 289.896,7883 291,7883 L297,7883 C298.105,7883 299,7884.197 299,7885.302 L299,7889.302 |
| C299,7890.407 298.105,7891 297,7891 L295,7891 C293.896,7891 293,7890.407 293,7889.302 L293,7888.302 |
| C293,7887.75 293.448,7887.302 294,7887.302 C294.552,7887.302 295,7887.75 295,7888.302 |
| C295,7888.854 295.448,7889.302 296,7889.302 C296.552,7889.302 297,7888.854 297,7888.302)"}, |
| { "Cat", |
| R"(M26.753,210.905c-4.68,19.271-1.375,33.856,8.258,46.243c9.633,12.387-1.102,19.543-9.082,23.398 |
| s-11.012,6.332-11.562,11.836s6.883,26.978,10.461,30.556s11.563,11.285,16.789,19.27c5.231,7.98,12.11,2.754,12.11,2.754 |
| c4.953,3.855,9.91,0,9.91,0c8.809,4.129,14.039-1.652,14.039-1.652c4.402-5.23-4.953-10.734-4.953-10.734 |
| c-5.781-10.184-10.184-1.926-11.836-4.129s-3.027-2.477-11.836-12.66s14.039-6.883,22.02-8.809s23.122-12.109,23.122-12.109 |
| c0,12.109,4.129,10.184,10.184,16.516s8.809,10.461,16.789,13.762c7.98,3.305,11.836,2.754,18.993,7.434s22.02,3.855,22.02,3.855 |
| c6.605,2.204,12.938,0,12.938,0c15.965,0,9.359-5.504,3.578-12.938s-17.34-1.102-22.57-4.68s-18.168-9.082-24.774-12.938 |
| c-6.605-3.855,0-10.734,0-17.066s4.953-11.285,4.953-11.285h25.598c0,0,19.816-1.375,25.047,9.359s13.211,12.938,13.488,18.719 |
| c0.278,5.781-4.68,6.332-4.68,6.332c-11.012-3.027-11.285,14.59-11.285,14.59c13.488,17.892,39.638-7.434,39.638-7.434 |
| c30.277-2.754,28.074-47.344,28.074-47.344c6.055-4.402,15.691-15.965,22.02-26.427c6.332-10.461,24.223-18.441,40.188-10.734 |
| c15.965,7.707,18.719-5.23,18.719-5.23c5.504,0.824,7.156-6.332,7.156-6.332c7.156-7.98-5.504-9.91-5.781-29.727 |
| s-16.789-23.399-15.965-29.176c0.824-5.781,17.617-24.223,13.488-22.571c-3.603,1.44-18.739,8.964-22.53,10.853 |
| c-0.126-0.498-0.375-1.208-0.868-2.317c-2.204-4.953-26.427,10.734-26.427,10.734s-38.396,22.709-45.83,24.362 |
| c-7.435,1.652-6.605-3.305-15.688-2.477c-9.083,0.824-13.628,1.652-54.501-15.692c-40.877-17.34-115.325,10.546-115.325,10.546 |
| S-8.608,82.798,40.935,41.924S24.215-33.009,8.111,56.167C-7.992,145.344,31.433,191.64,26.753,210.905z)" }, |
| { "Rabit", |
| R"(M526.834,235.822c-6.308-15.153-11.856-30.576-18.748-45.546c-5.969-12.966-15.985-20.689-27.282-27.287 |
| c-6.455-3.766-13.681-6.205-20.563-8.865c-2.102-0.812-3.447-3.309-3.007-5.517c1.126-5.643,2.379-11.607,3.187-17.629 |
| c0.489-3.664-0.425-7.495-0.47-11.253c-0.061-5.101-0.012-10.204,0.196-15.3c0.363-8.829-1.918-17.157-4.039-25.614 |
| c-1.359-5.423-0.367-11.478-1.959-16.789c-1.652-5.521,0.322-12.212-4.961-16.614c-0.118-0.098-0.184-0.343-0.167-0.51 |
| c0.844-8.576-5.484-14.574-8.373-21.714c-2.933-7.246-7.752-14.157-15.879-17.617c-2.881-1.225-5.516-3.023-8.482-4.974 |
| c-1.881-1.24-4.007-0.466-4.745,1.664c-2.546,7.364-5.116,14.035-6.622,20.935c-1.488,6.847-5.111,13.048-3.998,20.898 |
| c0.8,5.618-2.685,11.771-3.88,17.764c-0.633,3.17-0.963,6.397-1.302,9.649c-0.232,2.24-1.656,2.685-3.06,0.918 |
| c-3.366-4.243-6.328-8.507-10.38-11.004c-6.977-4.296-12.162-10.689-18.996-14.745c-10.674-6.332-21.519-12.917-33.138-16.956 |
| c-11.519-4.007-24.027-5.463-36.23-7.047c-3.212-0.416-6.643,0.845-10.507,2.049c-2.15,0.669-3.076,2.713-2.036,4.712 |
| c3.594,6.908,6.817,13.358,10.457,19.563c6.027,10.278,12.286,20.433,18.813,30.4c3.701,5.651,8.192,10.779,12.232,16.214 |
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| c-0.886,0.755-0.959,2.444-1.453,3.685c-0.844,2.113-1.313,4.533-2.66,6.259c-4.174,5.332-4.953,11.493-5.471,17.911 |
| c-0.322,3.978-1.502,7.874-2.068,11.844c-0.09,0.637-0.041,1.294,0.053,1.901c0.159,1.041-0.534,3.477-1.469,5.528 |
| c-3.473,7.634-5.899,16.026-13.064,21.172c-1.832,1.313-2.35,1.921-0.91,1.75c1.44-0.171,2.641-0.18,2.686-0.021 |
| s-1.637,0.926-3.746,1.714c-0.318,0.118-0.641,0.236-0.963,0.358c-2.113,0.788-2.848,1.689-1.644,2.016 |
| c1.203,0.327,0.461,1.2-1.665,1.955c-1.889,0.669-3.709,1.313-5.569,1.975c-2.126,0.75-3.035,1.767-2.036,2.264 |
| c1,0.498,0.245,1.294-1.681,1.779s-3.272,1.375-3.003,1.979c0.27,0.604-1.306,1.444-3.509,1.91 |
| c-3.966,0.836-7.939,1.701-11.963,2.068c-1.301,0.118-2.7-0.086-4.08-0.478c-2.166-0.616-5.605-1.624-7.858-1.575 |
| c-13.17,0.282-35.672,4.391-44.778,6.148c-2.211,0.429-5.818,0.979-8.062,1.212c-3.052,0.314-6.308,0.649-9.666,0.996 |
| c-2.24,0.232-3.77,0.689-3.411,1.023c0.355,0.335-1.089,1.184-3.228,1.897c-9.833,3.288-19.849,6.634-29.906,9.996 |
| c-2.138,0.714-3.297,1.611-2.583,2.003c0.714,0.392-0.4,1.403-2.521,2.171c-5.675,2.048-11.355,3.725-15.802,7.054 |
| c-4.814,3.607-10.164,6.479-14.913,10.286c-5.349,4.284-12.795,5.944-19.331,8.747c-0.62,0.266-1.24,0.53-2.056,0.886 |
| c-1.139,0.489-1.155,1.293-0.033,1.795s0.563,1.999-1.245,3.346c-3.929,2.922-7.813,5.814-11.738,8.735 |
| c-1.808,1.347-2.734,2.746-2.069,3.129c0.665,0.384-0.396,1.571-2.371,2.656c-1.33,0.73-2.64,1.448-3.941,2.167 |
| c-1.975,1.085-3.484,2.146-3.375,2.37c0.114,0.225,1.424,0.188,2.934-0.086c1.505-0.273,1.408,0.771-0.22,2.326 |
| c-7.181,6.854-14.125,13.492-21.094,20.106c-0.718,0.681-1.481,1.313-2.436,2.101c-1.375,1.131-1.008,1.648,0.808,1.146 |
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| c-2.199,3.015-4.345,5.965-6.679,9.168c-1.326,1.819-0.947,2.518,0.844,1.555c1.792-0.963,2.518-0.062,1.559,1.979 |
| c-3.537,7.52-7.226,14.052-7.789,21.93c-0.277,3.88-2.317,7.63-4.304,11.824c-0.963,2.036-0.853,3.162,0.126,2.46 |
| c0.979-0.702,1.469,0.534,1.085,2.754c-1.812,10.457-3.578,20.669-5.328,30.768c-0.384,2.22-0.106,3.773,0.624,3.468 |
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| c-0.245-0.927-2.211-1.849-4.456-2.036c-0.498-0.041-1.008-0.086-1.53-0.131c-2.244-0.188-3.125-1.905-1.962-3.839 |
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| { "Fish", |
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| { "Turtle", |
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| }; |
| |
| /* |
| * Helper function that gets the all of the t-values that need to be added between |
| * one t-value on a path to the next, from a sorted queue |tValuesToAdd|. Converts |
| * the value from its proportion across the whole line to it's proportion relative |
| * to the current segment. |
| */ |
| std::vector<SkScalar> getTValuesForSegment(std::deque<float>* tValuesToAdd, float t, float tNext) { |
| std::vector<SkScalar> tVector; |
| while (!tValuesToAdd->empty() && tValuesToAdd->front() > t && tValuesToAdd->front() < tNext) { |
| SkScalar total_t = tValuesToAdd->front(); |
| tValuesToAdd->pop_front(); |
| SkScalar relative_t = (total_t - t) / (tNext - t); |
| tVector.push_back(relative_t); |
| } |
| return tVector; |
| } |
| |
| /* |
| * Helper function that takes a vector of t-values and chops a cubic at those correct |
| * values, added it to the path |out|. |
| */ |
| void addSegmentsFromTValues(const SkPoint cubic_pts[4], std::vector<SkScalar> t_values, SkPath* out) { |
| const size_t arr_size = t_values.size(); |
| const int dst_size = (3*arr_size) + 4; |
| std::vector<SkPoint> split_pts(dst_size); |
| SkChopCubicAt(cubic_pts, split_pts.data(), t_values.data(), arr_size); |
| |
| SkPathBuilder builder; |
| for (size_t i = 0; i < arr_size + 1; i++) { |
| builder.cubicTo(split_pts[(i*3)+1], split_pts[(i*3)+2], split_pts[(i*3)+3]); |
| } |
| *out = builder.detach(); |
| } |
| |
| /* |
| * Helper function that given a path, it's t-values (sorted), and t-values to add |
| * (sorted), returns a new path that is all cubic beziers, with verbs at each of |
| * those t-values. |
| */ |
| bool createPathFromTValues(const SkPath& in, std::deque<float> tValuesToAdd, std::vector<float> tValues, SkPath* out) { |
| SkPath::Iter iter(in, false); |
| bool fBreak = false; |
| |
| // Only increment if we draw on the path. |
| size_t t_value_idx = 0; |
| SkPathBuilder builder; |
| |
| for (;;) { |
| if (fBreak) break; |
| bool needToSplit = false; |
| SkPoint pts[4]; |
| SkPath::Verb verb = iter.next(pts); |
| |
| // The last t-value is always the end of the path (when t=1). |
| if (t_value_idx >= tValues.size() - 1) { |
| break; |
| } |
| // t and tNext are the start and end of the current segment. |
| float t = tValues[t_value_idx]; |
| float tNext = tValues[t_value_idx+1]; |
| |
| // Check if current tValueToAdd is on this current segment. |
| if (!tValuesToAdd.empty() && tValuesToAdd.front() > t && tValuesToAdd.front() < tNext) { |
| needToSplit = true; |
| } |
| |
| switch (verb) { |
| case SkPath::kMove_Verb: |
| // Only supports one contour currently. |
| builder.moveTo(pts[0]); |
| break; |
| case SkPath::kLine_Verb: { |
| t_value_idx++; |
| SkPoint pt1, pt2; |
| pt1 = pts[0]*(1.0f / 3.0f) + pts[1]*(2.0f / 3.0f); |
| pt2 = pts[0]*(2.0f / 3.0f) + pts[1]*(1.0f / 3.0f); |
| if (!needToSplit) { |
| builder.cubicTo(pt1, pt2, pts[1]); |
| } else { |
| std::vector<SkScalar> tVector = getTValuesForSegment(&tValuesToAdd, t, tNext); |
| const SkPoint cubic_pts[4] = {pts[0], pt1, pt2, pts[1]}; |
| addSegmentsFromTValues(cubic_pts, tVector, out); |
| } |
| break; |
| } |
| case SkPath::kQuad_Verb: { |
| t_value_idx++; |
| SkPoint pt1, pt2; |
| pt1 = pts[0] + (pts[1]-pts[0])*(2.0f / 3.0f); |
| pt2 = pts[2] + (pts[1]-pts[2])*(2.0f / 3.0f); |
| if (!needToSplit) { |
| builder.cubicTo(pt1, pt2, pts[2]); |
| } else { |
| std::vector<SkScalar> tVector = getTValuesForSegment(&tValuesToAdd, t, tNext); |
| const SkPoint cubic_pts[4] = {pts[0], pt1, pt2, pts[2]}; |
| addSegmentsFromTValues(cubic_pts, tVector, out); |
| } |
| break; |
| } |
| case SkPath::kCubic_Verb: |
| t_value_idx++; |
| if (!needToSplit) { |
| builder.cubicTo(pts[1], pts[2], pts[3]); |
| } else { |
| std::vector<SkScalar> tVector = getTValuesForSegment(&tValuesToAdd, t, tNext); |
| addSegmentsFromTValues(pts, tVector, out); |
| } |
| break; |
| case SkPath::kConic_Verb: |
| // Conic not yet supported. |
| return false; |
| case SkPath::kClose_Verb: |
| // Close not yet supported. |
| builder.close(); |
| break; |
| case SkPath::kDone_Verb: |
| fBreak = true; |
| } |
| } |
| *out = builder.detach(); |
| return true; |
| } |
| |
| /* |
| * Helper function to get the total lengths the verbs take of a path and put it |
| * into a vector. |
| */ |
| std::vector<SkScalar> getTValues(const SkPath& path) { |
| std::vector<SkScalar> tValues; |
| SkPathMeasure measure(path, false); |
| SkScalar length = measure.getLength(); |
| if (length <= 0) { |
| SkDebugf("Length of path is 0.\n"); |
| return tValues; |
| } |
| const SkContourMeasure* cmeasure = measure.currentMeasure(); |
| tValues.push_back(0.0f); |
| for (const auto vmeasure: *cmeasure) { |
| tValues.push_back(vmeasure.fDistance / length); |
| } |
| |
| if (measure.nextContour()) { |
| SkDebugf("Path has more than 1 contour.\n"); |
| return {}; |
| } |
| return tValues; |
| } |
| |
| /* |
| * Helper function that creates a deque from a sorted vector |original| and adds |
| * values from a sorted vector |additional| in sorted order. |
| */ |
| std::deque<float> getTValuesToAdd(std::vector<SkScalar> original, std::vector<SkScalar> additional) { |
| std::deque<float> tValuesToAdd; |
| size_t i = 0, j = 0; |
| while (i < original.size() && j < additional.size()) { |
| if (additional[j] < original[i]) { |
| tValuesToAdd.push_back(additional[j]); |
| j++; |
| } else if (additional[j] > original[i]) { |
| i++; |
| } else { // additional[j] == original[i] |
| i++; |
| j++; |
| } |
| } |
| while (j < additional.size()) { |
| tValuesToAdd.push_back(additional[j]); |
| j++; |
| } |
| return tValuesToAdd; |
| } |
| |
| /* |
| * Extension to SkPath::Interpolate function that takes two arbitrary SkPaths. |
| * |
| * The current functionality of SkPath::Interpolate requires that the two paths |
| * have identical verbs (same number of verbs and verb types). This function does |
| * preprocessing on the two paths to create two new paths that fit this requirement |
| * without modifying the original path. |
| * |
| * The function uses a list of t-values to determine where to place points along |
| * the path, and adds more of these points based on the other paths values. Then all |
| * verbs are converted to cubic functions. When t-values need to be added, the cubic |
| * is chopped at the correct positions in accordance to the t-values. |
| * |
| * TODO: Add support for multiple contours, conic verbs, and close verbs. |
| * TODO: Fix phrasing as we don't use actual t-values of the curves just proportional |
| * distances(?) |
| */ |
| bool generalInterpolate(const SkPath& beginning, const SkPath& ending, SkScalar weight, SkPath* out) { |
| // Use existing path interpolation if possible. |
| if (beginning.isInterpolatable(ending)) { |
| return beginning.interpolate(ending, weight, out); |
| } |
| |
| // TODO: Check if isValid()? |
| if (beginning.isEmpty() || !beginning.isFinite() || ending.isEmpty() || !ending.isFinite()) { |
| return false; |
| } |
| |
| // New paths to store the transformed paths. |
| SkPath beginningCubic; |
| SkPath endingCubic; |
| beginningCubic.reset(); |
| endingCubic.reset(); |
| |
| // Append the total distances up to each verb in the path into a vector. |
| std::vector<SkScalar> tValues1 = getTValues(beginning); |
| std::vector<SkScalar> tValues2 = getTValues(ending); |
| if (tValues1.empty() || tValues2.empty()) { |
| return false; |
| } |
| |
| // The t-values to add for the respective paths from the other. |
| std::deque<float> tValuesToAdd1 = getTValuesToAdd(tValues1, tValues2); |
| std::deque<float> tValuesToAdd2 = getTValuesToAdd(tValues2, tValues1); |
| |
| // Form the cubic versions of each path with the new points along it. |
| createPathFromTValues(beginning, tValuesToAdd1, tValues1, &beginningCubic); |
| createPathFromTValues(ending, tValuesToAdd2, tValues2, &endingCubic); |
| |
| return beginningCubic.interpolate(endingCubic, weight, out); |
| } |
| |
| class PathLerpSlide final : public Slide { |
| public: |
| PathLerpSlide() |
| : fTimeMapper({0.5f, 0}, {0.5f, 1}) { |
| fName = "PathLerp"; |
| } |
| |
| private: |
| void load(SkScalar w, SkScalar h) override { |
| fSize = {w, h}; |
| |
| this->updateAnimatingPaths(); |
| } |
| |
| void resize(SkScalar w, SkScalar h) override { fSize = {w, h}; } |
| |
| void draw(SkCanvas* canvas) override { |
| SkPaint path_paint; |
| path_paint.setColor(0xff424242); |
| path_paint.setStyle(SkPaint::kStroke_Style); |
| path_paint.setAntiAlias(true); |
| path_paint.setStrokeCap(SkPaint::kRound_Cap); |
| path_paint.setStrokeWidth(10 / fPathTransform.getScaleX()); |
| |
| SkAutoCanvasRestore acr(canvas, true); |
| canvas->concat(fPathTransform); |
| canvas->drawPath(fInterpolatedPath, path_paint); |
| |
| const auto draw_vertices = [this](SkCanvas* canvas, const SkPath& path, float opacity) { |
| SkPaint vertex_paint, ctrl_paint; |
| vertex_paint.setColor4f({1, 0, 0, opacity}); |
| vertex_paint.setAntiAlias(true); |
| ctrl_paint.setColor4f({0, 0, 1, opacity}); |
| ctrl_paint.setAntiAlias(true); |
| |
| const float vertex_radius = 6 / fPathTransform.getScaleX(), |
| ctrl_radius = 4 / fPathTransform.getScaleX(); |
| |
| for (const auto [verb, pts, weights] : SkPathPriv::Iterate(path)) { |
| switch (verb) { |
| case SkPathVerb::kMove: // pts: [ vertex ] |
| canvas->drawCircle(pts[0], vertex_radius, vertex_paint); |
| break; |
| case SkPathVerb::kLine: // pts: [ prev_vertex, vertex ] |
| canvas->drawCircle(pts[1], vertex_radius, vertex_paint); |
| break; |
| case SkPathVerb::kQuad: // pts: [ prev_vertex, ctrl, vertex ] |
| canvas->drawCircle(pts[1], ctrl_radius, ctrl_paint); |
| canvas->drawCircle(pts[2], vertex_radius, vertex_paint); |
| break; |
| case SkPathVerb::kCubic: // pts: [ prev_vertex, ctrl0, ctrl1, vertex ] |
| canvas->drawCircle(pts[1], ctrl_radius, ctrl_paint); |
| canvas->drawCircle(pts[2], ctrl_radius, ctrl_paint); |
| canvas->drawCircle(pts[3], vertex_radius, vertex_paint); |
| break; |
| case SkPathVerb::kConic: // pts: [ prev_vertex, ctrl, vertex ] |
| canvas->drawCircle(pts[1], ctrl_radius, ctrl_paint); |
| canvas->drawCircle(pts[2], vertex_radius, vertex_paint); |
| break; |
| case SkPathVerb::kClose: // pts: [] |
| break; |
| } |
| } |
| }; |
| |
| if (fShowVertices) { |
| draw_vertices(canvas, fInterpolatedPath, 1); |
| |
| // also show the input paths & vertices |
| path_paint.setAlphaf(.15f); |
| path_paint.setStrokeWidth(3 / fPathTransform.getScaleX()); |
| |
| canvas->drawPath(fPaths.first , path_paint); |
| canvas->drawPath(fPaths.second, path_paint); |
| draw_vertices(canvas, fPaths.first , .15f); |
| draw_vertices(canvas, fPaths.second, .15f); |
| } |
| |
| this->drawControls(); |
| } |
| |
| bool animate(double nanos) override { |
| if (!fTimeBase) { |
| fTimeBase = nanos; |
| } |
| |
| if (fDraggingProgress) { |
| // When progress is controlled by dragging the slidebar, adjust the time base such |
| // that the animation continues seamlessly when the slider is released. |
| |
| // what the (signed) progress should be according to the clock |
| const float clock_progress_signed = |
| std::fmod((nanos - fTimeBase)*0.000000001*fAnimationSpeed, 2) - 1; |
| // what progress should be to match the slidebar |
| const float clock_progress_adjusted = |
| std::copysign(fCurrentProgress, clock_progress_signed); |
| // what the clock should be to match the slidebar |
| const float nanos_adjusted = (clock_progress_adjusted + 1)*1000000000/fAnimationSpeed; |
| |
| fTimeBase = nanos - nanos_adjusted; |
| } else { |
| // Oscillating between 0..1 |
| fCurrentProgress = |
| std::abs((std::fmod((nanos - fTimeBase)*0.000000001*fAnimationSpeed, 2) - 1)); |
| } |
| |
| // Interpolate with easing |
| // TODO: generate the synthetic paths once, in updateAnimatingPaths(), then use |
| // regular interpolation here. |
| return generalInterpolate(fPaths.first, |
| fPaths.second, |
| fTimeMapper.computeYFromX(fCurrentProgress), |
| &fInterpolatedPath); |
| } |
| |
| bool onChar(SkUnichar c) override { |
| switch (c) { |
| case 'v': |
| fShowVertices = !fShowVertices; |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| bool onMouse(SkScalar x, SkScalar y, skui::InputState state, skui::ModifierKey) override { |
| // Show the progress slider when hovering the bottom third. |
| fShowSlider = y > fSize.height() * .66f; |
| |
| return false; |
| } |
| |
| void updateAnimatingPaths() { |
| auto p0 = SkParsePath::FromSVGString(fSelectedPaths[0]->fSVGString); |
| auto p1 = SkParsePath::FromSVGString(fSelectedPaths[1]->fSVGString); |
| SkAssertResult(p0.has_value()); |
| SkAssertResult(p1.has_value()); |
| |
| const SkRect b0 = p0->computeTightBounds(), |
| b1 = p1->computeTightBounds(); |
| |
| // Transform all paths to a normalized size, such that they occupy roughly the same space. |
| static constexpr SkRect kNormRect = {0, 0, 512, 512}; |
| |
| fPaths = { |
| p0->makeTransform(SkMatrix::RectToRectOrIdentity(b0, kNormRect, |
| SkMatrix::kCenter_ScaleToFit)), |
| p1->makeTransform(SkMatrix::RectToRectOrIdentity(b1, kNormRect, |
| SkMatrix::kCenter_ScaleToFit)), |
| }; |
| |
| |
| // Scale and center such that the path animation fills 90% of the view. |
| SkRect bounds = fPaths.first.computeTightBounds(); |
| bounds.join(fPaths.second.computeTightBounds()); |
| |
| const SkRect dst_rect = SkRect::MakeSize(fSize) |
| .makeInset(fSize.width() * .05f, fSize.height() * .05f); |
| fPathTransform = |
| SkMatrix::RectToRectOrIdentity(kNormRect, dst_rect, SkMatrix::kCenter_ScaleToFit); |
| } |
| |
| void drawControls() { |
| // path controls |
| if (ImGui::Begin("Path Options")) { |
| for (size_t i = 0; i < 2; ++i) { |
| const SkString label = SkStringPrintf("Path %zu", i + 1); |
| if (ImGui::BeginCombo(label.c_str(), fSelectedPaths[i]->fName)) { |
| for (const auto& path_desc : gSamplePaths) { |
| const auto is_selected = (fSelectedPaths[i] == &path_desc); |
| if (ImGui::Selectable(path_desc.fName) && !is_selected) { |
| fSelectedPaths[i] = &path_desc; |
| this->updateAnimatingPaths(); |
| } |
| if (is_selected) { |
| ImGui::SetItemDefaultFocus(); |
| } |
| } |
| ImGui::EndCombo(); |
| } |
| } |
| |
| ImGui::Checkbox("Show vertices", &fShowVertices); |
| |
| } |
| ImGui::End(); |
| |
| if (!fShowSlider) { |
| return; |
| } |
| |
| // progress slider |
| ImGui::SetNextWindowBgAlpha(.75f); |
| if (ImGui::Begin("Progress Slider", nullptr, ImGuiWindowFlags_NoDecoration | |
| ImGuiWindowFlags_NoResize | |
| ImGuiWindowFlags_NoMove | |
| ImGuiWindowFlags_NoSavedSettings | |
| ImGuiWindowFlags_NoFocusOnAppearing | |
| ImGuiWindowFlags_NoNav)) { |
| static constexpr float kSliderHeight = 100; |
| ImGui::SetWindowPos({0, fSize.height() - kSliderHeight}); |
| ImGui::SetWindowSize({fSize.width(), kSliderHeight}); |
| |
| ImGui::PushItemWidth(-1); |
| ImGui::SliderFloat("", &fCurrentProgress, 0, 1, nullptr, ImGuiSliderFlags_NoInput); |
| fDraggingProgress = ImGui::IsItemActive(); |
| ImGui::PopItemWidth(); |
| } |
| ImGui::End(); |
| } |
| |
| SkSize fSize = {0,0}; |
| std::pair<SkPath, SkPath> fPaths; // currently morphing paths |
| SkPath fInterpolatedPath; |
| SkMatrix fPathTransform = SkMatrix::I(); |
| |
| float fAnimationSpeed = 1.f; |
| double fTimeBase = 0; |
| const SkCubicMap fTimeMapper; // for animation easing |
| float fCurrentProgress = 0; // Interpolation progress [0..1] |
| |
| // UI stuff |
| const PathDesc* fSelectedPaths[2] = {&gSamplePaths[0], &gSamplePaths[1]}; |
| bool fDraggingProgress = false; |
| bool fShowVertices = false; |
| bool fShowSlider = false; |
| }; |
| |
| } // namespace |
| |
| DEF_SLIDE(return new PathLerpSlide();) |
| |
| |
