mirror of
https://github.com/crystalidea/qt6windows7.git
synced 2024-11-27 06:28:26 +08:00
337 lines
11 KiB
C++
337 lines
11 KiB
C++
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// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include <QtCore>
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#include <QtWidgets>
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#include <qmath.h>
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#define WORLD_SIZE 8
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int world_map[WORLD_SIZE][WORLD_SIZE] = {
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{ 1, 1, 1, 1, 6, 1, 1, 1 },
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{ 1, 0, 0, 1, 0, 0, 0, 7 },
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{ 1, 1, 0, 1, 0, 1, 1, 1 },
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{ 6, 0, 0, 0, 0, 0, 0, 3 },
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{ 1, 8, 8, 0, 8, 0, 8, 1 },
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{ 2, 2, 0, 0, 8, 8, 7, 1 },
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{ 3, 0, 0, 0, 0, 0, 0, 5 },
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{ 2, 2, 2, 2, 7, 4, 4, 4 },
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};
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#define TEXTURE_SIZE 64
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#define TEXTURE_BLOCK (TEXTURE_SIZE * TEXTURE_SIZE)
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class Raycasting: public QWidget
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{
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public:
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Raycasting(QWidget *parent = nullptr)
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: QWidget(parent)
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, angle(0.5)
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, playerPos(1.5, 1.5)
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, angleDelta(0)
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, moveDelta(0)
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, touchDevice(false) {
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// http://www.areyep.com/RIPandMCS-TextureLibrary.html
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textureImg.load(":/textures.png");
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textureImg = textureImg.convertToFormat(QImage::Format_ARGB32);
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Q_ASSERT(textureImg.width() == TEXTURE_SIZE * 2);
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Q_ASSERT(textureImg.bytesPerLine() == 4 * TEXTURE_SIZE * 2);
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textureCount = textureImg.height() / TEXTURE_SIZE;
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watch.start();
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ticker.start(25, this);
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setAttribute(Qt::WA_OpaquePaintEvent, true);
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setMouseTracking(false);
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}
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void updatePlayer() {
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int interval = qBound(20ll, watch.elapsed(), 250ll);
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watch.start();
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angle += angleDelta * interval / 1000;
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qreal step = moveDelta * interval / 1000;
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qreal dx = cos(angle) * step;
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qreal dy = sin(angle) * step;
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QPointF pos = playerPos + 3 * QPointF(dx, dy);
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int xi = static_cast<int>(pos.x());
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int yi = static_cast<int>(pos.y());
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if (world_map[yi][xi] == 0)
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playerPos = playerPos + QPointF(dx, dy);
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}
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void showFps() {
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static QElapsedTimer frameTick;
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static int totalFrame = 0;
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if (!(totalFrame & 31)) {
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const qint64 elapsed = frameTick.elapsed();
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frameTick.start();
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int fps = 32 * 1000 / (1 + elapsed);
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setWindowTitle(QString("Raycasting (%1 FPS)").arg(fps));
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}
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totalFrame++;
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}
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void render() {
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// setup the screen surface
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if (buffer.size() != bufferSize)
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buffer = QImage(bufferSize, QImage::Format_ARGB32);
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int bufw = buffer.width();
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int bufh = buffer.height();
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if (bufw <= 0 || bufh <= 0)
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return;
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// we intentionally cheat here, to avoid detach
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const uchar *ptr = buffer.bits();
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QRgb *start = (QRgb*)(ptr);
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QRgb stride = buffer.bytesPerLine() / 4;
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QRgb *finish = start + stride * bufh;
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// prepare the texture pointer
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const uchar *src = textureImg.bits();
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const QRgb *texsrc = reinterpret_cast<const QRgb*>(src);
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// cast all rays here
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qreal sina = sin(angle);
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qreal cosa = cos(angle);
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qreal u = cosa - sina;
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qreal v = sina + cosa;
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qreal du = 2 * sina / bufw;
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qreal dv = -2 * cosa / bufw;
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for (int ray = 0; ray < bufw; ++ray, u += du, v += dv) {
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// every time this ray advances 'u' units in x direction,
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// it also advanced 'v' units in y direction
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qreal uu = (u < 0) ? -u : u;
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qreal vv = (v < 0) ? -v : v;
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qreal duu = 1 / uu;
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qreal dvv = 1 / vv;
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int stepx = (u < 0) ? -1 : 1;
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int stepy = (v < 0) ? -1 : 1;
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// the cell in the map that we need to check
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qreal px = playerPos.x();
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qreal py = playerPos.y();
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int mapx = static_cast<int>(px);
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int mapy = static_cast<int>(py);
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// the position and texture for the hit
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int texture = 0;
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qreal hitdist = 0.1;
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qreal texofs = 0;
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bool dark = false;
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// first hit at constant x and constant y lines
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qreal distx = (u > 0) ? (mapx + 1 - px) * duu : (px - mapx) * duu;
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qreal disty = (v > 0) ? (mapy + 1 - py) * dvv : (py - mapy) * dvv;
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// loop until we hit something
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while (texture <= 0) {
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if (distx > disty) {
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// shorter distance to a hit in constant y line
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hitdist = disty;
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disty += dvv;
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mapy += stepy;
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texture = world_map[mapy][mapx];
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if (texture > 0) {
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dark = true;
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if (stepy > 0) {
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qreal ofs = px + u * (mapy - py) / v;
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texofs = ofs - floor(ofs);
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} else {
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qreal ofs = px + u * (mapy + 1 - py) / v;
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texofs = ofs - floor(ofs);
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}
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}
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} else {
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// shorter distance to a hit in constant x line
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hitdist = distx;
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distx += duu;
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mapx += stepx;
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texture = world_map[mapy][mapx];
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if (texture > 0) {
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if (stepx > 0) {
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qreal ofs = py + v * (mapx - px) / u;
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texofs = ofs - floor(ofs);
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} else {
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qreal ofs = py + v * (mapx + 1 - px) / u;
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texofs = ceil(ofs) - ofs;
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}
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}
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}
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}
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// get the texture, note that the texture image
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// has two textures horizontally, "normal" vs "dark"
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int col = static_cast<int>(texofs * TEXTURE_SIZE);
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col = qBound(0, col, TEXTURE_SIZE - 1);
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texture = (texture - 1) % textureCount;
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const QRgb *tex = texsrc + TEXTURE_BLOCK * texture * 2 +
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(TEXTURE_SIZE * 2 * col);
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if (dark)
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tex += TEXTURE_SIZE;
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// start from the texture center (horizontally)
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int h = static_cast<int>(bufw / hitdist / 2);
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int dy = (TEXTURE_SIZE << 12) / h;
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int p1 = ((TEXTURE_SIZE / 2) << 12) - dy;
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int p2 = p1 + dy;
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// start from the screen center (vertically)
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// y1 will go up (decrease), y2 will go down (increase)
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int y1 = bufh / 2;
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int y2 = y1 + 1;
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QRgb *pixel1 = start + y1 * stride + ray;
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QRgb *pixel2 = pixel1 + stride;
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// map the texture to the sliver
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while (y1 >= 0 && y2 < bufh && p1 >= 0) {
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*pixel1 = tex[p1 >> 12];
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*pixel2 = tex[p2 >> 12];
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p1 -= dy;
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p2 += dy;
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--y1;
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++y2;
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pixel1 -= stride;
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pixel2 += stride;
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}
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// ceiling and floor
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for (; pixel1 > start; pixel1 -= stride)
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*pixel1 = qRgb(0, 0, 0);
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for (; pixel2 < finish; pixel2 += stride)
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*pixel2 = qRgb(96, 96, 96);
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}
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update(QRect(QPoint(0, 0), bufferSize));
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}
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protected:
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void resizeEvent(QResizeEvent*) {
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touchDevice = false;
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if (touchDevice) {
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if (width() < height()) {
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trackPad = QRect(0, height() / 2, width(), height() / 2);
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centerPad = QPoint(width() / 2, height() * 3 / 4);
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bufferSize = QSize(width(), height() / 2);
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} else {
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trackPad = QRect(width() / 2, 0, width() / 2, height());
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centerPad = QPoint(width() * 3 / 4, height() / 2);
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bufferSize = QSize(width() / 2, height());
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}
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} else {
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trackPad = QRect();
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bufferSize = size();
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}
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update();
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}
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void timerEvent(QTimerEvent*) {
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updatePlayer();
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render();
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showFps();
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}
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void paintEvent(QPaintEvent *event) {
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QPainter p(this);
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p.setCompositionMode(QPainter::CompositionMode_Source);
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p.drawImage(event->rect(), buffer, event->rect());
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if (touchDevice && event->rect().intersects(trackPad)) {
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p.fillRect(trackPad, Qt::white);
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p.setPen(QPen(QColor(224, 224, 224), 6));
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int rad = qMin(trackPad.width(), trackPad.height()) * 0.3;
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p.drawEllipse(centerPad, rad, rad);
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p.setPen(Qt::NoPen);
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p.setBrush(Qt::gray);
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QPolygon poly;
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poly << QPoint(-30, 0);
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poly << QPoint(0, -40);
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poly << QPoint(30, 0);
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p.translate(centerPad);
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for (int i = 0; i < 4; ++i) {
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p.rotate(90);
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p.translate(0, 20 - rad);
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p.drawPolygon(poly);
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p.translate(0, rad - 20);
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}
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}
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p.end();
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}
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void keyPressEvent(QKeyEvent *event) {
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event->accept();
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if (event->key() == Qt::Key_Left)
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angleDelta = 1.3 * M_PI;
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if (event->key() == Qt::Key_Right)
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angleDelta = -1.3 * M_PI;
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if (event->key() == Qt::Key_Up)
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moveDelta = 2.5;
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if (event->key() == Qt::Key_Down)
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moveDelta = -2.5;
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}
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void keyReleaseEvent(QKeyEvent *event) {
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event->accept();
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if (event->key() == Qt::Key_Left)
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angleDelta = (angleDelta > 0) ? 0 : angleDelta;
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if (event->key() == Qt::Key_Right)
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angleDelta = (angleDelta < 0) ? 0 : angleDelta;
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if (event->key() == Qt::Key_Up)
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moveDelta = (moveDelta > 0) ? 0 : moveDelta;
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if (event->key() == Qt::Key_Down)
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moveDelta = (moveDelta < 0) ? 0 : moveDelta;
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}
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void mousePressEvent(QMouseEvent *event) {
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qreal dx = centerPad.x() - event->position().toPoint().x();
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qreal dy = centerPad.y() - event->position().toPoint().y();
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angleDelta = dx * 2 * M_PI / width();
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moveDelta = dy * 10 / height();
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}
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void mouseMoveEvent(QMouseEvent *event) {
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qreal dx = centerPad.x() - event->position().toPoint().x();
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qreal dy = centerPad.y() - event->position().toPoint().y();
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angleDelta = dx * 2 * M_PI / width();
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moveDelta = dy * 10 / height();
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}
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void mouseReleaseEvent(QMouseEvent*) {
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angleDelta = 0;
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moveDelta = 0;
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}
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private:
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QElapsedTimer watch;
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QBasicTimer ticker;
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QImage buffer;
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qreal angle;
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QPointF playerPos;
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qreal angleDelta;
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qreal moveDelta;
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QImage textureImg;
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int textureCount;
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bool touchDevice;
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QRect trackPad;
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QPoint centerPad;
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QSize bufferSize;
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};
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int main(int argc, char **argv)
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{
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QApplication app(argc, argv);
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Raycasting w;
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w.setWindowTitle("Raycasting");
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w.resize(640, 480);
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w.show();
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return app.exec();
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}
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