#include "Globals.h"
#include "BiomeView.h"
#include "QtChunk.h"
#include <QPainter>
#include <QResizeEvent>
static const int DELTA_STEP = 120; // The normal per-notch wheel delta
BiomeView::BiomeView(QWidget * parent) :
super(parent),
m_X(0),
m_Z(0),
m_Zoom(1),
m_IsMouseDragging(false),
m_MouseWheelDelta(0)
{
// Create the image used for undefined chunks:
int offset = 0;
for (int y = 0; y < 16; y++)
{
for (int x = 0; x < 16; x++)
{
uchar color = (((x & 8) ^ (y & 8)) == 0) ? 0x44 : 0x88;
m_EmptyChunkImage[offset++] = color;
m_EmptyChunkImage[offset++] = color;
m_EmptyChunkImage[offset++] = color;
m_EmptyChunkImage[offset++] = 0xff;
}
}
// Create the startup image:
redraw();
// Add a chunk-update callback mechanism:
connect(&m_Cache, SIGNAL(chunkAvailable(int, int)), this, SLOT(chunkAvailable(int, int)));
// Allow mouse and keyboard interaction:
setFocusPolicy(Qt::StrongFocus);
setMouseTracking(true);
}
QSize BiomeView::minimumSizeHint() const
{
return QSize(300, 300);
}
QSize BiomeView::sizeHint() const
{
return QSize(800, 600);
}
void BiomeView::setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource)
{
// Replace the source in the cache:
m_Cache.setChunkSource(a_ChunkSource);
// Redraw with the new source:
redraw();
}
void BiomeView::setPosition(int a_BlockX, int a_BlockZ)
{
m_X = a_BlockX;
m_Z = a_BlockZ;
redraw();
}
void BiomeView::setZoomLevel(double a_ZoomLevel)
{
m_Zoom = a_ZoomLevel;
redraw();
}
void BiomeView::redraw()
{
if (!hasData())
{
// No data means no image is displayed, no need to compose:
update();
return;
}
int chunksize = 16 * m_Zoom;
// first find the center block position
int centerchunkx = floor(m_X / 16);
int centerchunkz = floor(m_Z / 16);
// and the center of the screen
int centerx = m_Image.width() / 2;
int centery = m_Image.height() / 2;
// and align for panning
centerx -= (m_X - centerchunkx * 16) * m_Zoom;
centery -= (m_Z - centerchunkz * 16) * m_Zoom;
// now calculate the topleft block on the screen
int startx = centerchunkx - centerx / chunksize - 1;
int startz = centerchunkz - centery / chunksize - 1;
// and the dimensions of the screen in blocks
int blockswide = m_Image.width() / chunksize + 3;
int blockstall = m_Image.height() / chunksize + 3;
for (int z = startz; z < startz + blockstall; z++)
{
for (int x = startx; x < startx + blockswide; x++)
{
drawChunk(x, z);
}
}
update();
}
void BiomeView::chunkAvailable(int a_ChunkX, int a_ChunkZ)
{
drawChunk(a_ChunkX, a_ChunkZ);
update();
}
void BiomeView::reload()
{
if (!hasData())
{
return;
}
m_Cache.reload();
redraw();
}
void BiomeView::drawChunk(int a_ChunkX, int a_ChunkZ)
{
if (!hasData())
{
return;
}
//fetch the chunk:
ChunkPtr chunk = m_Cache.fetch(a_ChunkX, a_ChunkZ);
// Figure out where on the screen this chunk should be drawn:
// first find the center chunk
int centerchunkx = floor(m_X / 16);
int centerchunkz = floor(m_Z / 16);
// and the center chunk screen coordinates
int centerx = m_Image.width() / 2;
int centery = m_Image.height() / 2;
// which need to be shifted to account for panning inside that chunk
centerx -= (m_X - centerchunkx * 16) * m_Zoom;
centery -= (m_Z - centerchunkz * 16) * m_Zoom;
// centerx,y now points to the top left corner of the center chunk
// so now calculate our x,y in relation
double chunksize = 16 * m_Zoom;
centerx += (a_ChunkX - centerchunkx) * chunksize;
centery += (a_ChunkZ - centerchunkz) * chunksize;
int srcoffset = 0;
uchar * bits = m_Image.bits();
int imgstride = m_Image.bytesPerLine();
int skipx = 0,skipy = 0;
int blockwidth = chunksize, blockheight = chunksize;
// now if we're off the screen we need to crop
if (centerx < 0)
{
skipx = -centerx;
centerx = 0;
}
if (centery < 0)
{
skipy = -centery;
centery = 0;
}
// or the other side, we need to trim
if (centerx + blockwidth > m_Image.width())
{
blockwidth = m_Image.width() - centerx;
}
if (centery + blockheight > m_Image.height())
{
blockheight = m_Image.height() - centery;
}
if ((blockwidth <= 0) || (skipx >= blockwidth))
{
return;
}
int imgoffset = centerx * 4 + centery * imgstride;
// If the chunk is valid, use its data; otherwise use the empty placeholder:
const uchar * src = m_EmptyChunkImage;
if (chunk.get() != nullptr)
{
src = chunk->getImage();
}
// Blit or scale-blit the image:
for (int z = skipy; z < blockheight; z++, imgoffset += imgstride)
{
srcoffset = floor((double)z / m_Zoom) * 16 * 4;
if (m_Zoom == 1.0)
{
memcpy(bits + imgoffset, src + srcoffset + skipx * 4, (blockwidth - skipx) * 4);
}
else
{
int xofs = 0;
for (int x = skipx; x < blockwidth; x++, xofs +=4)
{
memcpy(bits + imgoffset + xofs, src + srcoffset + (int)floor((double)x / m_Zoom) * 4, 4);
}
}
}
}
void BiomeView::resizeEvent(QResizeEvent * a_Event)
{
m_Image = QImage(a_Event->size(), QImage::Format_RGB32);
redraw();
}
void BiomeView::paintEvent(QPaintEvent * a_Event)
{
QPainter p(this);
if (hasData())
{
p.drawImage(QPoint(0, 0), m_Image);
}
else
{
p.drawText(a_Event->rect(), Qt::AlignCenter, "No chunk source selected");
}
p.end();
}
void BiomeView::mousePressEvent(QMouseEvent * a_Event)
{
m_LastX = a_Event->x();
m_LastY = a_Event->y();
m_IsMouseDragging = true;
}
void BiomeView::mouseMoveEvent(QMouseEvent * a_Event)
{
// If there's no data displayed, bail out:
if (!hasData())
{
return;
}
if (m_IsMouseDragging)
{
// The user is dragging the mouse, move the view around:
m_X += (m_LastX - a_Event->x()) / m_Zoom;
m_Z += (m_LastY - a_Event->y()) / m_Zoom;
m_LastX = a_Event->x();
m_LastY = a_Event->y();
redraw();
return;
}
// Update the status bar info text:
int blockX = floor((a_Event->x() - width() / 2) / m_Zoom + m_X);
int blockZ = floor((a_Event->y() - height() / 2) / m_Zoom + m_Z);
int chunkX, chunkZ;
int relX = blockX, relY, relZ = blockZ;
cChunkDef::AbsoluteToRelative(relX, relY, relZ, chunkX, chunkZ);
auto chunk = m_Cache.fetch(chunkX, chunkZ);
int biome = (chunk.get() != nullptr) ? chunk->getBiome(relX, relZ) : biInvalidBiome;
emit hoverChanged(blockX, blockZ, biome);
}
void BiomeView::mouseReleaseEvent(QMouseEvent *)
{
m_IsMouseDragging = false;
}
void BiomeView::wheelEvent(QWheelEvent * a_Event)
{
m_MouseWheelDelta += a_Event->delta();
while (m_MouseWheelDelta >= DELTA_STEP)
{
emit wheelUp();
m_MouseWheelDelta -= DELTA_STEP;
}
while (m_MouseWheelDelta <= -DELTA_STEP)
{
emit wheelDown();
m_MouseWheelDelta += DELTA_STEP;
}
}
void BiomeView::keyPressEvent(QKeyEvent * a_Event)
{
switch (a_Event->key())
{
case Qt::Key_Up:
case Qt::Key_W:
{
m_Z -= 10.0 / m_Zoom;
redraw();
break;
}
case Qt::Key_Down:
case Qt::Key_S:
{
m_Z += 10.0 / m_Zoom;
redraw();
break;
}
case Qt::Key_Left:
case Qt::Key_A:
{
m_X -= 10.0 / m_Zoom;
redraw();
break;
}
case Qt::Key_Right:
case Qt::Key_D:
{
m_X += 10.0 / m_Zoom;
redraw();
break;
}
case Qt::Key_PageUp:
case Qt::Key_Q:
{
emit increaseZoom();
break;
}
case Qt::Key_PageDown:
case Qt::Key_E:
{
emit decreaseZoom();
break;
}
}
}
