428 lines
6.9 KiB
C++
428 lines
6.9 KiB
C++
#include "Globals.h"
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#include "BiomeView.h"
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#include "QtChunk.h"
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#include <QPainter>
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#include <QResizeEvent>
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static const int DELTA_STEP = 120; // The normal per-notch wheel delta
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BiomeView::BiomeView(QWidget * parent) :
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super(parent),
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m_X(0),
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m_Z(0),
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m_Zoom(1),
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m_IsMouseDragging(false),
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m_MouseWheelDelta(0)
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{
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// Create the image used for undefined chunks:
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int offset = 0;
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for (int y = 0; y < 16; y++)
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{
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for (int x = 0; x < 16; x++)
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{
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uchar color = (((x & 8) ^ (y & 8)) == 0) ? 0x44 : 0x88;
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m_EmptyChunkImage[offset++] = color;
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m_EmptyChunkImage[offset++] = color;
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m_EmptyChunkImage[offset++] = color;
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m_EmptyChunkImage[offset++] = 0xff;
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}
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}
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// Create the startup image:
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redraw();
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// Add a chunk-update callback mechanism:
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connect(&m_Cache, SIGNAL(chunkAvailable(int, int)), this, SLOT(chunkAvailable(int, int)));
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// Allow keyboard interaction:
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setFocusPolicy(Qt::StrongFocus);
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}
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QSize BiomeView::minimumSizeHint() const
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{
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return QSize(300, 300);
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}
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QSize BiomeView::sizeHint() const
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{
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return QSize(800, 600);
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}
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void BiomeView::setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource)
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{
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// Replace the source in the cache:
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m_Cache.setChunkSource(a_ChunkSource);
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// Redraw with the new source:
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redraw();
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}
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void BiomeView::redraw()
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{
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if (!hasData())
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{
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// No data means no image is displayed, no need to compose:
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update();
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return;
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}
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int chunksize = 16 * m_Zoom;
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// first find the center block position
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int centerchunkx = floor(m_X / 16);
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int centerchunkz = floor(m_Z / 16);
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// and the center of the screen
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int centerx = m_Image.width() / 2;
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int centery = m_Image.height() / 2;
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// and align for panning
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centerx -= (m_X - centerchunkx * 16) * m_Zoom;
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centery -= (m_Z - centerchunkz * 16) * m_Zoom;
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// now calculate the topleft block on the screen
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int startx = centerchunkx - centerx / chunksize - 1;
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int startz = centerchunkz - centery / chunksize - 1;
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// and the dimensions of the screen in blocks
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int blockswide = m_Image.width() / chunksize + 3;
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int blockstall = m_Image.height() / chunksize + 3;
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for (int z = startz; z < startz + blockstall; z++)
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{
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for (int x = startx; x < startx + blockswide; x++)
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{
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drawChunk(x, z);
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}
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}
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update();
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}
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void BiomeView::chunkAvailable(int a_ChunkX, int a_ChunkZ)
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{
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drawChunk(a_ChunkX, a_ChunkZ);
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update();
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}
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void BiomeView::reload()
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{
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if (!hasData())
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{
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return;
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}
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m_Cache.reload();
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redraw();
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}
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void BiomeView::drawChunk(int a_ChunkX, int a_ChunkZ)
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{
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if (!hasData())
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{
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return;
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}
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//fetch the chunk:
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ChunkPtr chunk = m_Cache.fetch(a_ChunkX, a_ChunkZ);
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// Figure out where on the screen this chunk should be drawn:
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// first find the center chunk
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int centerchunkx = floor(m_X / 16);
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int centerchunkz = floor(m_Z / 16);
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// and the center chunk screen coordinates
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int centerx = m_Image.width() / 2;
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int centery = m_Image.height() / 2;
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// which need to be shifted to account for panning inside that chunk
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centerx -= (m_X - centerchunkx * 16) * m_Zoom;
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centery -= (m_Z - centerchunkz * 16) * m_Zoom;
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// centerx,y now points to the top left corner of the center chunk
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// so now calculate our x,y in relation
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double chunksize = 16 * m_Zoom;
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centerx += (a_ChunkX - centerchunkx) * chunksize;
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centery += (a_ChunkZ - centerchunkz) * chunksize;
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int srcoffset = 0;
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uchar * bits = m_Image.bits();
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int imgstride = m_Image.bytesPerLine();
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int skipx = 0,skipy = 0;
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int blockwidth = chunksize, blockheight = chunksize;
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// now if we're off the screen we need to crop
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if (centerx < 0)
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{
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skipx = -centerx;
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centerx = 0;
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}
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if (centery < 0)
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{
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skipy = -centery;
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centery = 0;
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}
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// or the other side, we need to trim
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if (centerx + blockwidth > m_Image.width())
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{
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blockwidth = m_Image.width() - centerx;
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}
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if (centery + blockheight > m_Image.height())
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{
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blockheight = m_Image.height() - centery;
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}
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if ((blockwidth <= 0) || (skipx >= blockwidth))
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{
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return;
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}
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int imgoffset = centerx * 4 + centery * imgstride;
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// If the chunk is valid, use its data; otherwise use the empty placeholder:
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const uchar * src = m_EmptyChunkImage;
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if (chunk.get() != nullptr)
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{
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src = chunk->getImage();
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}
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// Blit or scale-blit the image:
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for (int z = skipy; z < blockheight; z++, imgoffset += imgstride)
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{
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srcoffset = floor((double)z / m_Zoom) * 16 * 4;
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if (m_Zoom == 1.0)
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{
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memcpy(bits + imgoffset, src + srcoffset + skipx * 4, (blockwidth - skipx) * 4);
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}
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else
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{
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int xofs = 0;
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for (int x = skipx; x < blockwidth; x++, xofs +=4)
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{
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memcpy(bits + imgoffset + xofs, src + srcoffset + (int)floor((double)x / m_Zoom) * 4, 4);
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}
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}
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}
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}
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void BiomeView::resizeEvent(QResizeEvent * a_Event)
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{
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m_Image = QImage(a_Event->size(), QImage::Format_RGB32);
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redraw();
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}
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void BiomeView::paintEvent(QPaintEvent * a_Event)
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{
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QPainter p(this);
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if (hasData())
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{
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p.drawImage(QPoint(0, 0), m_Image);
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}
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else
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{
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p.drawText(a_Event->rect(), Qt::AlignCenter, "No chunk source selected");
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}
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p.end();
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}
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void BiomeView::mousePressEvent(QMouseEvent * a_Event)
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{
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m_LastX = a_Event->x();
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m_LastY = a_Event->y();
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m_IsMouseDragging = true;
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}
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void BiomeView::mouseMoveEvent(QMouseEvent * a_Event)
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{
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if (m_IsMouseDragging)
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{
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// The user is dragging the mouse, move the view around:
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m_X += (m_LastX - a_Event->x()) / m_Zoom;
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m_Z += (m_LastY - a_Event->y()) / m_Zoom;
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m_LastX = a_Event->x();
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m_LastY = a_Event->y();
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redraw();
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return;
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}
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// TODO: Update the status bar info for the biome currently pointed at
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}
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void BiomeView::mouseReleaseEvent(QMouseEvent *)
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{
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m_IsMouseDragging = false;
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}
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void BiomeView::wheelEvent(QWheelEvent * a_Event)
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{
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m_MouseWheelDelta += a_Event->delta();
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while (m_MouseWheelDelta >= DELTA_STEP)
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{
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increaseZoom();
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m_MouseWheelDelta -= DELTA_STEP;
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}
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while (m_MouseWheelDelta <= -DELTA_STEP)
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{
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decreaseZoom();
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m_MouseWheelDelta += DELTA_STEP;
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}
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}
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void BiomeView::keyPressEvent(QKeyEvent * a_Event)
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{
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switch (a_Event->key())
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{
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case Qt::Key_Up:
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case Qt::Key_W:
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{
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m_Z -= 10.0 / m_Zoom;
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redraw();
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break;
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}
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case Qt::Key_Down:
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case Qt::Key_S:
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{
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m_Z += 10.0 / m_Zoom;
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redraw();
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break;
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}
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case Qt::Key_Left:
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case Qt::Key_A:
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{
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m_X -= 10.0 / m_Zoom;
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redraw();
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break;
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}
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case Qt::Key_Right:
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case Qt::Key_D:
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{
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m_X += 10.0 / m_Zoom;
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redraw();
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break;
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}
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case Qt::Key_PageUp:
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case Qt::Key_Q:
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{
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increaseZoom();
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break;
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}
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case Qt::Key_PageDown:
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case Qt::Key_E:
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{
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decreaseZoom();
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break;
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}
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}
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}
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void BiomeView::decreaseZoom()
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{
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if (m_Zoom > 1.001)
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{
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m_Zoom--;
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if (m_Zoom < 1.0)
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{
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// Just crossed the 100%, fixate the 100% threshold:
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m_Zoom = 1.0;
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}
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}
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else if (m_Zoom > 0.01)
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{
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m_Zoom = m_Zoom / 2;
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}
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redraw();
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}
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void BiomeView::increaseZoom()
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{
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if (m_Zoom > 0.99)
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{
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if (m_Zoom > 20.0)
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{
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// Zoom too large
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return;
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}
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m_Zoom++;
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}
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else
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{
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m_Zoom = m_Zoom * 2;
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if (m_Zoom > 1.0)
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{
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// Just crossed the 100%, fixate the 100% threshold:
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m_Zoom = 1.0;
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}
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}
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redraw();
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}
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