mirror of
https://github.com/clementine-player/Clementine
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67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
#ifndef Transformation_HPP
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#define Transformation_HPP
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#include "PerPixelMesh.hpp"
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#include <math.h>
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class Transforms
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{
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public:
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inline static void Zoom(PixelPoint &p, const PerPixelContext &context, float zoom, float zoomExponent)
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{
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float fZoom2 = powf( zoom, powf( zoomExponent, context.rad*2.0f - 1.0f));
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float fZoom2Inv = 1.0f/fZoom2;
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p.x -= 0.5;
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p.y -= 0.5;
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p.x *= fZoom2Inv;
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p.y *= fZoom2Inv;
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p.x += 0.5;
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p.y += 0.5;
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}
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inline static void Transform(PixelPoint &p, const PerPixelContext &context, float dx, float dy)
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{
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p.x -= dx;
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p.y -= dy;
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}
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inline static void Scale(PixelPoint &p, const PerPixelContext &context, float sy, float sx, float cx, float cy)
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{
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p.x = (p.x - cx)/sx + cx;
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p.y = (p.y - cy)/sy + cy;
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}
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inline static void Rotate(PixelPoint &p, const PerPixelContext &context, float angle, float cx, float cy)
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{
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float u2 = p.x - cx;
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float v2 = p.y - cy;
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float cos_rot = cosf(angle);
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float sin_rot = sinf(angle);
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p.x = u2*cos_rot - v2*sin_rot + cx;
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p.y = u2*sin_rot + v2*cos_rot + cy;
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}
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inline static void Warp(PixelPoint &p, const PerPixelContext &context, float time, float speed, float scale, float warp)
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{
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float fWarpTime = time * speed;
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float fWarpScaleInv = 1.0f / scale;
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float f[4];
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f[0] = 11.68f + 4.0f*cosf(fWarpTime*1.413f + 10);
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f[1] = 8.77f + 3.0f*cosf(fWarpTime*1.113f + 7);
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f[2] = 10.54f + 3.0f*cosf(fWarpTime*1.233f + 3);
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f[3] = 11.49f + 4.0f*cosf(fWarpTime*0.933f + 5);
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p.x += warp*0.0035f*sinf(fWarpTime*0.333f + fWarpScaleInv*(context.x*f[0] - context.y*f[3]));
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p.y += warp*0.0035f*cosf(fWarpTime*0.375f - fWarpScaleInv*(context.x*f[2] + context.y*f[1]));
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p.x += warp*0.0035f*cosf(fWarpTime*0.753f - fWarpScaleInv*(context.x*f[1] - context.y*f[2]));
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p.y += warp*0.0035f*sinf(fWarpTime*0.825f + fWarpScaleInv*(context.x*f[0] + context.y*f[3]));
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}
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};
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#endif
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