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63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
/*
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* Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#ifndef CRYINCLUDE_EDITOR_GRIDUTILS_H
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#define CRYINCLUDE_EDITOR_GRIDUTILS_H
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#pragma once
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namespace GridUtils
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{
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template <typename F>
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inline void IterateGrid(F& f, const float minPixelsPerTick, float zoomX, float originX, float fps, int left, int right)
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{
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float pixelsPerSecond = zoomX;
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float pixelsPerFrame = pixelsPerSecond / fps;
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float framesPerTick = ceil(minPixelsPerTick / pixelsPerFrame);
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float scale = 1;
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bool foundScale = false;
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int numIters = 0;
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for (float OOM = 1; !foundScale; OOM *= 10)
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{
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float scales[] = {1, 2, 5};
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for (int scaleIndex = 0; !foundScale && scaleIndex < sizeof(scales) / sizeof(scales[0]); ++scaleIndex)
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{
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scale = scales[scaleIndex] * OOM;
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if (framesPerTick <= scale + 0.1f)
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{
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framesPerTick = scale;
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foundScale = true;
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if (numIters++ > 1000)
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{
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break;
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}
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}
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}
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if (numIters++ > 1000)
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{
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break;
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}
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}
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float pixelsPerTick = pixelsPerFrame * framesPerTick;
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float timeAtLeft = -left / zoomX + originX;
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float frameAtLeft = ceil(timeAtLeft * fps / framesPerTick) * framesPerTick;
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float firstTick = floor((frameAtLeft / fps - originX) * zoomX + 0.5f) + left;
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int frame = int(frameAtLeft);
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int lockupPreventionCounter = 10000;
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for (float tickX = firstTick; tickX < right && lockupPreventionCounter >= 0; tickX += pixelsPerTick, --lockupPreventionCounter)
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{
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f(frame, aznumeric_cast<int>(tickX));
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frame += int(framesPerTick);
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}
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}
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}
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#endif // CRYINCLUDE_EDITOR_GRIDUTILS_H
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