mirror of
https://github.com/aseprite/aseprite.git
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100 lines
2.0 KiB
C++
100 lines
2.0 KiB
C++
// Aseprite Document Library
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// Copyright (c) 2001-2015 David Capello
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//
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// This file is released under the terms of the MIT license.
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// Read LICENSE.txt for more information.
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "doc/handle_anidir.h"
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#include "doc/frame.h"
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#include "doc/frame_tag.h"
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#include "doc/sprite.h"
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namespace doc {
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frame_t calculate_next_frame(
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const Sprite* sprite,
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frame_t frame,
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frame_t frameDelta,
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const FrameTag* tag,
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bool& pingPongForward)
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{
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if (frameDelta == 0)
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return frame;
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frame_t first = frame_t(0);
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frame_t last = sprite->lastFrame();
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AniDir aniDir = AniDir::FORWARD;
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if (tag) {
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frame_t loopFrom, loopTo;
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loopFrom = tag->fromFrame();
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loopTo = tag->toFrame();
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loopFrom = MID(first, loopFrom, last);
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loopTo = MID(first, loopTo, last);
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first = loopFrom;
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last = loopTo;
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aniDir = tag->aniDir();
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}
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frame_t frameRange = (last - first + 1);
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switch (aniDir) {
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case AniDir::REVERSE:
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frameDelta = -frameDelta;
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case AniDir::FORWARD:
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frame += frameDelta;
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while (frame > last) frame -= frameRange;
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while (frame < first) frame += frameRange;
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break;
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case AniDir::PING_PONG: {
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bool invertPingPong;
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if (frameDelta < 0) {
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frameDelta = -frameDelta;
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pingPongForward = !pingPongForward;
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invertPingPong = true;
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}
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else
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invertPingPong = false;
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while (--frameDelta >= 0) {
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if (pingPongForward) {
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++frame;
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if (frame > last) {
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frame = last-1;
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if (frame < first)
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frame = first;
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pingPongForward = false;
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}
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}
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else {
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--frame;
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if (frame < first) {
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frame = first+1;
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if (frame > last)
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frame = last;
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pingPongForward = true;
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}
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}
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}
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if (invertPingPong)
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pingPongForward = !pingPongForward;
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break;
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}
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}
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return frame;
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}
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} // namespace doc
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