88 lines
1.9 KiB
C++
88 lines
1.9 KiB
C++
#include <cmath>
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#include <vector>
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#include <cstdint>
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#include "raylib.h"
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#include "raymath.h"
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#define MAX_DEPTH 11
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struct branch
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{
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Color color;
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};
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static std::vector<branch> tree(MAX_DEPTH);
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Vector2 draw_line(Vector2 start, float angleDeg, float lenghth, Color color)
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{
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angleDeg += 180.0f;
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float angle = (angleDeg * PI) / 180.0f;
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float nx = lenghth * std::sin(angle);
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float ny = lenghth * std::cos(angle);
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Vector2 end = {start.x + nx, start.y + ny};
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DrawLineEx(start, end, 2.0f, color);
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return end;
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}
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void draw_branch(Vector2 start, float angle, float len, int dep)
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{
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if (dep >= MAX_DEPTH)
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return;
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Vector2 next = draw_line(start, angle, len, tree[dep].color);
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float next_len = 0.7f;
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draw_branch(next, angle + 45, len * next_len, dep + 1);
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draw_branch(next, angle - 45, len * next_len, dep + 1);
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}
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void generate_tree()
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{
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for (size_t i = 0; i < MAX_DEPTH; i++)
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{
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uint8_t r = GetRandomValue(0, 255);
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uint8_t g = GetRandomValue(0, 255);
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uint8_t b = GetRandomValue(0, 255);
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tree[i].color = (Color){r, g, b, 255};
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}
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}
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int main(void)
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{
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const int screenWidth = 800;
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const int screenHeight = 800;
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InitWindow(screenWidth, screenHeight, "raylib");
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SetTargetFPS(60);
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const int textureWidth = screenWidth;
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const int textureHeight = screenHeight;
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RenderTexture2D target = LoadRenderTexture(textureWidth, textureHeight);
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Vector2 start = {textureWidth / 2, textureHeight};
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generate_tree();
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BeginTextureMode(target);
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ClearBackground(WHITE);
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draw_branch(start, 0, textureHeight / 4, 1);
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EndTextureMode();
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Rectangle source = {0, 0, (float)target.texture.width, (float)-target.texture.height};
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Rectangle dest = {0, 0, screenWidth, screenHeight};
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Vector2 position = {0, 0};
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Vector2 origin = {0.0f, 0.0f};
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while (!WindowShouldClose())
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{
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BeginDrawing();
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DrawTexturePro(target.texture, source, dest, origin, 0.0f, WHITE);
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EndDrawing();
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}
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CloseWindow();
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return 0;
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} |