search-demo 四.键盘事件和帮助、控制信息

界面部分基本完成。程序的架构实在是恶心到不行，明天从头再来。

main.cpp:
C++语言: Codee#2609401#include

02#include

03#include "pathfinding.h"

04

05intmain(intargc,charargv[])

06{

07QApplicationa(argc,argv);

08Widgetwindow=newWidget;

09

10QRectfrect=window->frameGeometry();

11frect.moveCenter(QDesktopWidget().availableGeometry().center());

12window->move(frect.topLeft());

13window->show();

14

15returna.exec();

16}
path-finding.h:
C++语言: Codee#2609501#ifndef PATHFINDING_H

02#define PATHFINDING_H

03

04#include

05#include

06

07#include "control.h"

08

09classWidget:publicQWidget

10{

11Q_OBJECT

12

13public:

14Widget(QWidgetparent=0);

15voidpaintEvent(QPaintEventevent);

16voidmousePressEvent(QMouseEventevent);

17voidmouseMoveEvent(QMouseEventevent);

18voidkeyPressEvent(QKeyEventevent);

19voidsetWindowPixel(constQPoint&pos,boolopaque);

20

21private:

22enum{LENGTH=910};

23enum{WIDTH=700};

24enum{BLOCKSIZE=35};

25enum{MES_Y_OFFSET=16};

26

27boolblocks[LENGTH/BLOCKSIZE][WIDTH/BLOCKSIZE];

28boolonDrag;

29QPointhelpImagePos;

30QPointhelpMessagePos;

31QPointcontrolImagePos;

32QPointcontrolMessagePos;

33QPointcursorpos;

34QPointstartBlock;

35QPointendBlock;

36ControlcontrolMessage[5];

37boolcheckPosition(constQPoint&pos);

38intcontrolSelection;

39intspeed;

40};

41

42#endif// PATHFINDING_H
path-finding.cpp:
C++语言: Codee#26096001#include "pathfinding.h"

002

003Widget::Widget(QWidgetparent)

004:QWidget(parent)

005{

006for(inti=0;i<LENGTH/BLOCKSIZE;++i)

007for(intj=0;j<WIDTH/BLOCKSIZE;++j)

008blocks[i][j]=true;

009startBlock=QPoint(0,0);

010blocks[0][0]=false;

011

012endBlock=QPoint(10,10);

013blocks[10][10]=false;

014onDrag=false;

015

016controlMessage[0]=Control(QString("Dijkstra"),

017QColor(Qt::darkGreen));

018controlMessage[1]=Control(QString("Bi-Directional BFS"),

019QColor(Qt::darkGreen));

020

021

022helpImagePos=QPoint(5,5);

023helpMessagePos=QPoint(10,10);

024controlImagePos=QPoint(790,5);

025controlMessagePos=QPoint(795,10);

026controlSelection=0;

027speed=1;

028

029setAttribute(Qt::WA_StaticContents);

030setSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum);

031this->setMouseTracking(true);

032this->setFixedSize(LENGTH,WIDTH);

033

034/

035QImage image=new QImage;

036image->load(":/image/layer2.png");

037

038QImage fixedImage(image->size(), QImage::Format_ARGB32_Premultiplied);

039QPainter imagePainter(&fixedImage);

040imagePainter.setCompositionMode(QPainter::CompositionMode_Source);

041imagePainter.fillRect(fixedImage.rect(), Qt::transparent);

042imagePainter.setCompositionMode(QPainter::CompositionMode_SourceOver);

043imagePainter.drawImage(QPoint(10,10), image);

044imagePainter.end();

045/

046

047//QImage pic(":/image/test.jpg");

048/

049I try to use QLabel to show the help message

050but failed,picture and text can't show at the

051same time

052label->setPixmap(QPixmap::convertFromImage(pic));

053/

054/

055button->setText(controlMessage[0].GetString() + "n" +

056controlMessage[1].GetString());

057label->setPixmap(QPixmap::fromImage(pic));

058label->show();

059/

060/

061QHBoxLayout layout = new QHBoxLayout;

062layout->addWidget(label);

063this->setLayout(layout);

064/

065}

066

067voidWidget::paintEvent(QPaintEventevent)

068{

069QPainterpainter(this);

070painter.setOpacity(0.8);

071QColorcolor=Qt::red;

072

073/ draw the start block /

074/

075painter.fillRect(QRect(BLOCKSIZEstartBlock.x(), BLOCKSIZEstartBlock.y(),

076BLOCKSIZE, BLOCKSIZE), color);

077/

078

079//qDebug("The startblock pos:%d,%d", startBlock.x(), startBlock.y());

080/ draw the simple blocks /

081for(inti=0;i<LENGTH/BLOCKSIZE;++i)

082for(intj=0;j<WIDTH/BLOCKSIZE;++j)

083{

084QPointcur(i,j);

085if(cur==startBlock)

086color=Qt::red;

087elseif(cur==endBlock)

088color=Qt::green;

089

090elseif(!blocks[i][j])

091color=Qt::gray;

092else

093color=Qt::white;

094painter.fillRect(QRect(BLOCKSIZEi,BLOCKSIZEj,

095BLOCKSIZE,BLOCKSIZE),color);

096}

097

098painter.setPen(QPen(Qt::gray));

099/ draw the grids /

100for(inti=0;i<LENGTH;i+=BLOCKSIZE)

101painter.drawLine(i,0,

102i,WIDTH);

103for(intj=0;j<=WIDTH;j+=BLOCKSIZE)

104painter.drawLine(0,j,

105LENGTH,j);

106

107painter.setFont(QFont("Arial",50));

108painter.drawText(rect(),Qt::AlignCenter,"path-finding demo");

109

110QImageimage=newQImage;

111image->load(":/image/layer1.png");

112/

113qDebug("imagesize:t%d,%d", image->size().width(),

114image->size().height());

115/

116image=image->scaled(330,100);

117

118

119//QImage fixedImage(image->size(), QImage::Format_ARGB32_Premultiplied);

120

121QPainterimagePainter(this);

122//imagePainter.setCompositionMode(QPainter::CompositionMode_Source);

123imagePainter.setCompositionMode(QPainter::CompositionMode_SourceOver);

124imagePainter.drawImage(helpImagePos,image);

125

126

127QPaintertextPainter(this);

128QFontfont("Arial",8);

129font.setWeight(QFont::Bold);

130//font.setStretch(1);

131QStringstring[]=

132{

133"Drag Green and Red block to set source and target",

134"Hold down mouse button to draw maze",

135"Press and to select algorithm",

136"Press and to set demo speed",

137"Press to start or stop demo",

138"Press to reset"

139};

140

141textPainter.setFont(font);

142textPainter.setPen(QPen(Qt::white));

143for(inti=0;i<6;++i)

144textPainter.drawText(10,20+MES_Y_OFFSETi,string[i]);

145

146QStringcontrolstr[]=

147{

148"A (Manhattan)",

149"A (Euclidean)",

150"A (Chebyshev)",

151"Dijkstra",

152"Bi-Directional BFS",

153};

154image->load(":/image/layer1.png");

155imagePainter.drawImage(controlImagePos,image);

156for(inti=0;i<5;++i)

157{

158if(i==controlSelection)

159textPainter.setPen(QPen(Qt::red));

160else

161textPainter.setPen(QPen(Qt::white));

162textPainter.drawText(795,20+MES_Y_OFFSETi,controlstr[i]);

163}

164textPainter.drawText(795,20+MES_Y_OFFSET5,

165QString("Speed:")+QString::number(8speed)+QString("X"));

166

167

168/

169qDebug("helpimagepos:%d,%dnmes:%d,%d",helpImagePos.x(),

170helpImagePos.y(),

171helpMessagePos.x(),

172helpMessagePos.y());

173/

174/

175painter.drawText(rect(),Qt::AlignRight &Qt::AlignTop,

176controlMessage[1].GetString());

177/

178

179

180}

181

182/ 1. check the cursor's position,if on the start blocks,go to 2,

183 else go to 3;

184 2. drag the start block,set onDrag=true

185 3. just draw the current block

186/

187voidWidget::mousePressEvent(QMouseEventevent)

188{

189cursorpos=QPoint(event->pos().x()/BLOCKSIZE,

190event->pos().y()/BLOCKSIZE);

191if(cursorpos==startBlock)

192onDrag=true;

193else

194{

195setWindowPixel(event->pos(),false);

196onDrag=false;

197}

198}

199

200voidWidget::mouseMoveEvent(QMouseEventevent)

201{

202/

203 check the cursor's position

204 if out of the main window

205 the application will faile

206/

207if(checkPosition(event->pos()))

208{

209QPointtmppos=QPoint(event->pos().x()/BLOCKSIZE,

210event->pos().y()/BLOCKSIZE);

211if(cursorpos!=tmppos&&

212(event->buttons()&Qt::LeftButton) ||

213(event->buttons()&Qt::RightButton))

214// event->buttons() & Qt::RightButton)

215{

216//qDebug("Time elapsed: %d ms", time.msecsTo(curTime));

217//setWindowPixel(event->pos(), true);

218/ is on drag ,use this to change the start

219 block's position,clear the old pos

220 then take the new pos

221/

222if(onDrag)

223{

224//qDebug("tmppos:%d,%d", tmppos.x(), tmppos.y());

225blocks[startBlock.x()][startBlock.y()]=true;

226startBlock=tmppos;

227blocks[tmppos.x()][tmppos.y()]=false;

228}

229setWindowPixel(event->pos(),onDrag);

230}

231}

232//cursorpos=tmppos;

233}

234

235voidWidget::setWindowPixel(constQPoint&pos,boolopaque)

236{

237intx=pos.x()/BLOCKSIZE;

238inty=pos.y()/BLOCKSIZE;

239cursorpos=QPoint(x,y);

240

241if(!opaque)

242blocks[x][y]=!blocks[x][y];

243update();

244}

245

246boolWidget::checkPosition(constQPoint&pos)

247{

248QRectrect(0,0,LENGTH,WIDTH);

249returnrect.contains(pos);

250}

251

252voidWidget::keyPressEvent(QKeyEventevent)

253{

254intkeyPressed=toupper(event->key());

255switch(keyPressed)

256{

257case'W':

258if(--controlSelection<0)

259controlSelection=4;

260break;

261case'S':

262if(++controlSelection>4)

263controlSelection=0;

264break;

265case'A':

266if(--speed<0)

267speed=0;

268break;

269case'D':

270if(++speed>5)

271speed=5;

272break;

273case'R':

274for(inti=0;i<LENGTH/BLOCKSIZE;++i)

275for(intj=0;j<WIDTH/BLOCKSIZE;++j)

276blocks[i][j]=true;

277blocks[startBlock.x()][startBlock.y()]=false;

278blocks[endBlock.x()][endBlock.y()]=false;

279break;

280case' ':

281break;

282default:

283return;

284

285}

286

287if(keyPressed=='W'||keyPressed=='S'||

288keyPressed=='A'||keyPressed=='D'||

289keyPressed=='R'||keyPressed==' ')

290{

291qDebug("keypressed: %c;sel: %d",keyPressed,controlSelection);

292repaint();

293}

294}原文链接: https://www.cnblogs.com/invisible/archive/2012/04/16/2452103.html