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105 строки
4.1 KiB
105 строки
4.1 KiB
/*******************************************************************************************
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*
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* raylib [shapes] example - math angle rotation
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*
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* Example complexity rating: [★☆☆☆] 1/4
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*
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* Example originally created with raylib 5.6-dev, last time updated with raylib 5.6
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*
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* Example contributed by Kris (@krispy-snacc) and reviewed by Ramon Santamaria (@raysan5)
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2025 Kris (@krispy-snacc)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include "raymath.h" // for DEG2RAD
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 720;
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const int screenHeight = 400;
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InitWindow(screenWidth, screenHeight, "raylib [shapes] example - math angle rotation");
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SetTargetFPS(60);
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Vector2 center = { screenWidth / 2.0f, screenHeight / 2.0f };
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const float lineLength = 150.0f;
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// Predefined angles for fixed lines
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int angles[] = { 0, 30, 60, 90 };
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int numAngles = sizeof(angles)/sizeof(angles[0]);
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float totalAngle = 0.0f; // Animated rotation angle
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose())
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{
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// Update
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//----------------------------------------------------------------------------------
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totalAngle += 1.0f; // degrees per frame
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if (totalAngle >= 360.0f) totalAngle -= 360.0f;
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(WHITE);
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DrawText("Fixed angles + rotating line", 10, 10, 20, LIGHTGRAY);
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// Draw fixed-angle lines with colorful gradient
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for (int i = 0; i < numAngles; i++)
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{
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float rad = angles[i] * DEG2RAD;
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Vector2 end = { center.x + cosf(rad) * lineLength,
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center.y + sinf(rad) * lineLength };
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// Gradient color from green → cyan → blue → magenta
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Color col;
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switch(i)
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{
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case 0: col = GREEN; break;
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case 1: col = ORANGE; break;
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case 2: col = BLUE; break;
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case 3: col = MAGENTA; break;
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default: col = WHITE; break;
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}
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DrawLineEx(center, end, 5.0f, col);
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// Draw angle label slightly offset along the line
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Vector2 textPos = { center.x + cosf(rad) * (lineLength + 20),
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center.y + sinf(rad) * (lineLength + 20) };
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DrawText(TextFormat("%d°", angles[i]), (int)textPos.x, (int)textPos.y, 20, col);
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}
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// Draw animated rotating line with changing color
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float animRad = totalAngle * DEG2RAD;
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Vector2 animEnd = { center.x + cosf(animRad) * lineLength,
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center.y + sinf(animRad) * lineLength };
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// Cycle through HSV colors for animated line
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Color animCol = ColorFromHSV(fmodf(totalAngle, 360.0f), 0.8f, 0.9f);
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DrawLineEx(center, animEnd, 5.0f, animCol);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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CloseWindow();
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//--------------------------------------------------------------------------------------
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return 0;
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}
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