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#include <engine/graphics.h>
#include <game/mapitems.h>
#include <game/layers.h>
#include "flow.h"
CFlow::CFlow()
{
m_pCells = 0;
m_Height = 0;
m_Width = 0;
m_Spacing = 16;
}
void CFlow::DbgRender()
{
if(!m_pCells)
return;
IGraphics::CLineItem Array[1024];
int NumItems = 0;
Graphics()->TextureSet(-1);
Graphics()->LinesBegin();
for(int y = 0; y < m_Height; y++)
for(int x = 0; x < m_Width; x++)
{
vec2 Pos(x*m_Spacing, y*m_Spacing);
vec2 Vel = m_pCells[y*m_Width+x].m_Vel * 0.01f;
Array[NumItems++] = IGraphics::CLineItem(Pos.x, Pos.y, Pos.x+Vel.x, Pos.y+Vel.y);
if(NumItems == 1024)
{
Graphics()->LinesDraw(Array, 1024);
NumItems = 0;
}
}
if(NumItems)
Graphics()->LinesDraw(Array, NumItems);
Graphics()->LinesEnd();
}
void CFlow::Init()
{
if(m_pCells)
{
mem_free(m_pCells);
m_pCells = 0;
}
CMapItemLayerTilemap *pTilemap = Layers()->GameLayer();
m_Width = pTilemap->m_Width*32/m_Spacing;
m_Height = pTilemap->m_Height*32/m_Spacing;
// allocate and clear
m_pCells = (CCell *)mem_alloc(sizeof(CCell)*m_Width*m_Height, 1);
for(int y = 0; y < m_Height; y++)
for(int x = 0; x < m_Width; x++)
m_pCells[y*m_Width+x].m_Vel = vec2(0.0f, 0.0f);
}
void CFlow::Update()
{
if(!m_pCells)
return;
for(int y = 0; y < m_Height; y++)
for(int x = 0; x < m_Width; x++)
m_pCells[y*m_Width+x].m_Vel *= 0.85f;
}
vec2 CFlow::Get(vec2 Pos)
{
if(!m_pCells)
return vec2(0,0);
int x = (int)(Pos.x / m_Spacing);
int y = (int)(Pos.y / m_Spacing);
if(x < 0 || y < 0 || x >= m_Width || y >= m_Height)
return vec2(0,0);
return m_pCells[y*m_Width+x].m_Vel;
}
void CFlow::Add(vec2 Pos, vec2 Vel, float Size)
{
if(!m_pCells)
return;
int x = (int)(Pos.x / m_Spacing);
int y = (int)(Pos.y / m_Spacing);
if(x < 0 || y < 0 || x >= m_Width || y >= m_Height)
return;
m_pCells[y*m_Width+x].m_Vel += Vel;
}
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