King_DuckZ/clooneljump
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Ignore offscreen segments.

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This commit is contained in:
King_DuckZ 2014-09-04 12:14:31 +02:00
parent efb0f93062
commit c27055f8d0
1 changed files with 15 additions and 9 deletions
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24
src/drawableline.cpp
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@ -112,24 +112,30 @@ namespace cloonel {
LineBase scaledLine(*this);
scaledLine += static_cast<short2>(parPos);
scaledLine *= parScaling;
const short2 wh(static_cast<short2>(m_sdlmain->WidthHeight()));
{
SDL_Rect screen;
screen.x = screen.y = 0;
const short2 wh(static_cast<short2>(m_sdlmain->WidthHeight()));
screen.w = wh.x();
screen.h = wh.y();
ClipLine(screen, scaledLine);
}
const int16_t h = static_cast<int16_t>(m_sdlmain->WidthHeight().y());
if (scaledLine[0] != scaledLine[1]) {
SDL_RenderDrawLine(
m_sdlmain->GetRenderer(),
scaledLine[0].x(),
h - scaledLine[0].y(),
scaledLine[1].x(),
h - scaledLine[1].y()
);
const bool isOnScreen = scaledLine[0] >= short2(0) and scaledLine[0] < wh and
scaledLine[1] >= short2(0) and scaledLine[1] < wh;
if (isOnScreen) {
const int16_t h = static_cast<int16_t>(m_sdlmain->WidthHeight().y());
SDL_RenderDrawLine(
m_sdlmain->GetRenderer(),
scaledLine[0].x(),
h - scaledLine[0].y(),
scaledLine[1].x(),
h - scaledLine[1].y()
);
}
}
//Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
//http://www.ginkgobitter.org/sdl/?SDL_RenderDrawLine