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Diffstat (limited to 'deps/raylib/examples/shapes/shapes_splines_drawing.c')
| -rw-r--r-- | deps/raylib/examples/shapes/shapes_splines_drawing.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/deps/raylib/examples/shapes/shapes_splines_drawing.c b/deps/raylib/examples/shapes/shapes_splines_drawing.c new file mode 100644 index 0000000..536b558 --- /dev/null +++ b/deps/raylib/examples/shapes/shapes_splines_drawing.c @@ -0,0 +1,273 @@ +/******************************************************************************************* +* +* raylib [shapes] example - splines drawing +* +* Example originally created with raylib 5.0, last time updated with raylib 5.0 +* +* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified, +* BSD-like license that allows static linking with closed source software +* +* Copyright (c) 2023 Ramon Santamaria (@raysan5) +* +********************************************************************************************/ + +#include "raylib.h" + +#define RAYGUI_IMPLEMENTATION +#include "raygui.h" // Required for UI controls + +#include <stdlib.h> // Required for: NULL + +#define MAX_SPLINE_POINTS 32 + +// Cubic Bezier spline control points +// NOTE: Every segment has two control points +typedef struct { + Vector2 start; + Vector2 end; +} ControlPoint; + +// Spline types +typedef enum { + SPLINE_LINEAR = 0, // Linear + SPLINE_BASIS, // B-Spline + SPLINE_CATMULLROM, // Catmull-Rom + SPLINE_BEZIER // Cubic Bezier +} SplineType; + +//------------------------------------------------------------------------------------ +// Program main entry point +//------------------------------------------------------------------------------------ +int main(void) +{ + // Initialization + //-------------------------------------------------------------------------------------- + const int screenWidth = 800; + const int screenHeight = 450; + + SetConfigFlags(FLAG_MSAA_4X_HINT); + InitWindow(screenWidth, screenHeight, "raylib [shapes] example - splines drawing"); + + Vector2 points[MAX_SPLINE_POINTS] = { + { 50.0f, 400.0f }, + { 160.0f, 220.0f }, + { 340.0f, 380.0f }, + { 520.0f, 60.0f }, + { 710.0f, 260.0f }, + }; + + // Array required for spline bezier-cubic, + // including control points interleaved with start-end segment points + Vector2 pointsInterleaved[3*(MAX_SPLINE_POINTS - 1) + 1] = { 0 }; + + int pointCount = 5; + int selectedPoint = -1; + int focusedPoint = -1; + Vector2 *selectedControlPoint = NULL; + Vector2 *focusedControlPoint = NULL; + + // Cubic Bezier control points initialization + ControlPoint control[MAX_SPLINE_POINTS-1] = { 0 }; + for (int i = 0; i < pointCount - 1; i++) + { + control[i].start = (Vector2){ points[i].x + 50, points[i].y }; + control[i].end = (Vector2){ points[i + 1].x - 50, points[i + 1].y }; + } + + // Spline config variables + float splineThickness = 8.0f; + int splineTypeActive = SPLINE_LINEAR; // 0-Linear, 1-BSpline, 2-CatmullRom, 3-Bezier + bool splineTypeEditMode = false; + bool splineHelpersActive = true; + + SetTargetFPS(60); // Set our game to run at 60 frames-per-second + //-------------------------------------------------------------------------------------- + + // Main game loop + while (!WindowShouldClose()) // Detect window close button or ESC key + { + // Update + //---------------------------------------------------------------------------------- + // Spline points creation logic (at the end of spline) + if (IsMouseButtonPressed(MOUSE_RIGHT_BUTTON) && (pointCount < MAX_SPLINE_POINTS)) + { + points[pointCount] = GetMousePosition(); + int i = pointCount - 1; + control[i].start = (Vector2){ points[i].x + 50, points[i].y }; + control[i].end = (Vector2){ points[i + 1].x - 50, points[i + 1].y }; + pointCount++; + } + + // Spline point focus and selection logic + for (int i = 0; i < pointCount; i++) + { + if (CheckCollisionPointCircle(GetMousePosition(), points[i], 8.0f)) + { + focusedPoint = i; + if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) selectedPoint = i; + break; + } + else focusedPoint = -1; + } + + // Spline point movement logic + if (selectedPoint >= 0) + { + points[selectedPoint] = GetMousePosition(); + if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) selectedPoint = -1; + } + + // Cubic Bezier spline control points logic + if ((splineTypeActive == SPLINE_BEZIER) && (focusedPoint == -1)) + { + // Spline control point focus and selection logic + for (int i = 0; i < pointCount - 1; i++) + { + if (CheckCollisionPointCircle(GetMousePosition(), control[i].start, 6.0f)) + { + focusedControlPoint = &control[i].start; + if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) selectedControlPoint = &control[i].start; + break; + } + else if (CheckCollisionPointCircle(GetMousePosition(), control[i].end, 6.0f)) + { + focusedControlPoint = &control[i].end; + if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) selectedControlPoint = &control[i].end; + break; + } + else focusedControlPoint = NULL; + } + + // Spline control point movement logic + if (selectedControlPoint != NULL) + { + *selectedControlPoint = GetMousePosition(); + if (IsMouseButtonReleased(MOUSE_LEFT_BUTTON)) selectedControlPoint = NULL; + } + } + + // Spline selection logic + if (IsKeyPressed(KEY_ONE)) splineTypeActive = 0; + else if (IsKeyPressed(KEY_TWO)) splineTypeActive = 1; + else if (IsKeyPressed(KEY_THREE)) splineTypeActive = 2; + else if (IsKeyPressed(KEY_FOUR)) splineTypeActive = 3; + //---------------------------------------------------------------------------------- + + // Draw + //---------------------------------------------------------------------------------- + BeginDrawing(); + + ClearBackground(RAYWHITE); + + if (splineTypeActive == SPLINE_LINEAR) + { + // Draw spline: linear + DrawSplineLinear(points, pointCount, splineThickness, RED); + } + else if (splineTypeActive == SPLINE_BASIS) + { + // Draw spline: basis + DrawSplineBasis(points, pointCount, splineThickness, RED); // Provide connected points array + + /* + for (int i = 0; i < (pointCount - 3); i++) + { + // Drawing individual segments, not considering thickness connection compensation + DrawSplineSegmentBasis(points[i], points[i + 1], points[i + 2], points[i + 3], splineThickness, MAROON); + } + */ + } + else if (splineTypeActive == SPLINE_CATMULLROM) + { + // Draw spline: catmull-rom + DrawSplineCatmullRom(points, pointCount, splineThickness, RED); // Provide connected points array + + /* + for (int i = 0; i < (pointCount - 3); i++) + { + // Drawing individual segments, not considering thickness connection compensation + DrawSplineSegmentCatmullRom(points[i], points[i + 1], points[i + 2], points[i + 3], splineThickness, MAROON); + } + */ + } + else if (splineTypeActive == SPLINE_BEZIER) + { + // NOTE: Cubic-bezier spline requires the 2 control points of each segnment to be + // provided interleaved with the start and end point of every segment + for (int i = 0; i < (pointCount - 1); i++) + { + pointsInterleaved[3*i] = points[i]; + pointsInterleaved[3*i + 1] = control[i].start; + pointsInterleaved[3*i + 2] = control[i].end; + } + + pointsInterleaved[3*(pointCount - 1)] = points[pointCount - 1]; + + // Draw spline: cubic-bezier (with control points) + DrawSplineBezierCubic(pointsInterleaved, 3*(pointCount - 1) + 1, splineThickness, RED); + + /* + for (int i = 0; i < 3*(pointCount - 1); i += 3) + { + // Drawing individual segments, not considering thickness connection compensation + DrawSplineSegmentBezierCubic(pointsInterleaved[i], pointsInterleaved[i + 1], pointsInterleaved[i + 2], pointsInterleaved[i + 3], splineThickness, MAROON); + } + */ + + // Draw spline control points + for (int i = 0; i < pointCount - 1; i++) + { + // Every cubic bezier point have two control points + DrawCircleV(control[i].start, 6, GOLD); + DrawCircleV(control[i].end, 6, GOLD); + if (focusedControlPoint == &control[i].start) DrawCircleV(control[i].start, 8, GREEN); + else if (focusedControlPoint == &control[i].end) DrawCircleV(control[i].end, 8, GREEN); + DrawLineEx(points[i], control[i].start, 1.0f, LIGHTGRAY); + DrawLineEx(points[i + 1], control[i].end, 1.0f, LIGHTGRAY); + + // Draw spline control lines + DrawLineV(points[i], control[i].start, GRAY); + //DrawLineV(control[i].start, control[i].end, LIGHTGRAY); + DrawLineV(control[i].end, points[i + 1], GRAY); + } + } + + if (splineHelpersActive) + { + // Draw spline point helpers + for (int i = 0; i < pointCount; i++) + { + DrawCircleLinesV(points[i], (focusedPoint == i)? 12.0f : 8.0f, (focusedPoint == i)? BLUE: DARKBLUE); + if ((splineTypeActive != SPLINE_LINEAR) && + (splineTypeActive != SPLINE_BEZIER) && + (i < pointCount - 1)) DrawLineV(points[i], points[i + 1], GRAY); + + DrawText(TextFormat("[%.0f, %.0f]", points[i].x, points[i].y), (int)points[i].x, (int)points[i].y + 10, 10, BLACK); + } + } + + // Check all possible UI states that require controls lock + if (splineTypeEditMode) GuiLock(); + + // Draw spline config + GuiLabel((Rectangle){ 12, 62, 140, 24 }, TextFormat("Spline thickness: %i", (int)splineThickness)); + GuiSliderBar((Rectangle){ 12, 60 + 24, 140, 16 }, NULL, NULL, &splineThickness, 1.0f, 40.0f); + + GuiCheckBox((Rectangle){ 12, 110, 20, 20 }, "Show point helpers", &splineHelpersActive); + + GuiUnlock(); + + GuiLabel((Rectangle){ 12, 10, 140, 24 }, "Spline type:"); + if (GuiDropdownBox((Rectangle){ 12, 8 + 24, 140, 28 }, "LINEAR;BSPLINE;CATMULLROM;BEZIER", &splineTypeActive, splineTypeEditMode)) splineTypeEditMode = !splineTypeEditMode; + + EndDrawing(); + //---------------------------------------------------------------------------------- + } + + // De-Initialization + //-------------------------------------------------------------------------------------- + CloseWindow(); // Close window and OpenGL context + //-------------------------------------------------------------------------------------- + + return 0; +} |