114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
#include "canvas/BackGround.hpp"
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#include "Math.hpp"
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#include "raylib.h"
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#include "rlgl.h"
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#include "raymath.h"
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#include "external/stb_perlin.h"
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// Public
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void BackGround::init(int size)
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{
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this->size = size;
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}
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void BackGround::newGen()
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{
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ClearBackground(backGroundColor);
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starts();
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moon();
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mounten(20, 0.3, (int)(mounten1 * size), (int)(mounten2 * size), mountenColor);
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mounten(21, 0.3, (int)(mounten2 * size), (int)(mounten3 * size), ColorLerp(mountenColor, BLACK, 0.1f));
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mounten(23, 0.3, (int)(mounten3 * size), (int)(mounten4 * size), ColorLerp(mountenColor, BLACK, 0.3f));
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}
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void BackGround::starts()
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{
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rlSetTexture(texShapes.id);
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rlBegin(RL_TRIANGLES);
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rlNormal3f(0.0f, 0.0f, 1.0f);
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for (size_t i = 1; i <= numOfStarts; i++)
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{
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int x = GetRandomValue(0, size);
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int y = GetRandomValue(0, size);
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int weight = GetRandomValue(1, 3);
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float alph = ((float)GetRandomValue(10, 200)) / 255.0f;
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Color color = ColorLerp(backGroundColor, starColor, alph);
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rlColor4ub(color.r, color.g, color.b, color.a);
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// topLeft
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rlVertex2f(x, y);
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// bottomLeft
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rlVertex2f(x, y + weight);
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// topRight
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rlVertex2f(x + weight, y);
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// bottomRight
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rlVertex2f(x + weight, y + weight);
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// topRight
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rlVertex2f(x + weight, y);
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// bottomLeft
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rlVertex2f(x, y + weight);
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}
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rlEnd();
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rlSetTexture(0);
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}
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void BackGround::moon()
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{
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int xpos = GetRandomValue(100, size - 100);
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int ypos = GetRandomValue(100, (int)(maxYPosOfMoon * size));
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int r = GetRandomValue((int)(minSizeOfMoon * size), (int)(maxSizeOfMoon * size));
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DrawCircle(xpos, ypos, r + 20, ColorLerp(backGroundColor, moonColor, 0.02f));
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DrawCircle(xpos, ypos, r + 10, ColorLerp(backGroundColor, moonColor, 0.05f));
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DrawCircle(xpos, ypos, r, moonColor);
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}
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void BackGround::mounten(size_t mountenSegments, float scale, int min, int max, Color color)
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{
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// get random offset in the perlin noise
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int offsetX = GetRandomValue(20, 1000);
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int offsetY = GetRandomValue(20, 1000);
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int x = 0;
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int diff = size / (mountenSegments - 1);
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float nx = (float)offsetX * scale;
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float p = stb_perlin_fbm_noise3(nx, offsetY, 1.0f, 2.0f, 0.5f, 6);
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p = (p + 1.0f) / 2.0f;
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int y = Lerp(min, max, p);
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rlSetTexture(texShapes.id);
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rlBegin(RL_TRIANGLES);
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rlNormal3f(0.0f, 0.0f, 1.0f);
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rlColor4ub(color.r, color.g, color.b, color.a);
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for (size_t i = 1; i <= mountenSegments; i++)
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{
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// topLeft
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rlVertex2f(x, y);
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// bottomLeft
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rlVertex2f(x, size);
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nx = (float)(i + offsetX) * scale;
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p = stb_perlin_fbm_noise3(nx, offsetY, 1.0f, 2.0f, 0.5f, 6);
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p = (p + 1.0f) / 2.0f;
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y = Lerp(min, max, p);
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x += diff;
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// topRight
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rlVertex2f(x, y);
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// bottomRight
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rlVertex2f(x, size);
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// topRight
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rlVertex2f(x, y);
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rlVertex2f(x - diff, size);
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}
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rlEnd();
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rlSetTexture(0);
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} |