窗口：
mywidget.h:
1 #ifndef MYWIDGET_H
2 #define MYWIDGET_H
3
4 #include <QWidget>
5 #include "ui_mywidget.h"
6 #include <QPaintEvent>
7 #include <QtGui>
8
9 class MyWidget : public QWidget
10 {
11 Q_OBJECT
12
13 public:
14 MyWidget(QWidget *parent = 0);
15 ~MyWidget();
16 QPointF ObjectPtoDisplayP(QPointF objPoint);
17 QPointF DisplayPtoObjectP(QPointF disPoint);
18 QPointF WidgetPtoObjectP(QPointF wigPoint);
19 QPointF ObjectPtoWidgetP(QPointF objPoint);
20 QPointF ValuePtoObjectP(QPointF valPoint);
21 QPointF ObjectPtoValueP(QPointF objPoint);
22 QPointF scaleIn(QPointF pos_before, QPointF scale_center, double scale_value);
23 QPointF scaleOut(QPointF pos_before, QPointF scale_center, double scale_value);
24
25 protected:
26 void paintEvent(QPaintEvent *event);
27 void wheelEvent(QWheelEvent *event);
28 void mousePressEvent(QMouseEvent *event);
29 void mouseMoveEvent(QMouseEvent *event);
30
31 private:
32 Ui::MyWidget ui;
33
34 int margin_size;
35
36 QPointF paint_org; //widget坐標系
37 QSize paint_size_first;
38 QSize paint_size_old;
39 QSize paint_size_new;
40 QPointF paint_center_old; //display坐標系
41 QPointF paint_center_new; //display坐標系
42
43 double offset_x;
44 double offset_y;
45
46 QPointF rect_center; //display坐標系
47 QPointF rect_topl; //display坐標系
48 QPointF rect_bottomr; //display坐標系
49
50 double scale_value;
51
52 QPointF mousepress_org; //display坐標系
53
54 QPointF axis_x_old; //display坐標系
55 QPointF axis_y_old; //display坐標系
56 double axis_scale;
57
58 double offsetv_x;
59 double offsetv_y;
60 double pixel_per_mm;
61
62 QPointF mouse_current_pos; //object坐標系
63 };
64
65 #endif // MYWIDGET_H
mywidget.cpp:
1 #include "mywidget.h"
2
3 MyWidget::MyWidget(QWidget *parent)
4 : QWidget(parent)
5 {
6 ui.setupUi(this);
7
8 margin_size = 35;
9
10 paint_org = QPointF(margin_size + 20, margin_size - 20);
11 paint_size_first = QSize(this->width() - margin_size * 2, this->height() - margin_size * 2);
12 paint_size_old = paint_size_first;
13 paint_size_new = paint_size_first;
14 paint_center_old = QPointF(paint_size_first.width() / 2, paint_size_first.height() / 2);
15 paint_center_new = paint_center_old;
16
17 offset_x = 0;
18 offset_y = paint_size_new.height();
19
20 rect_center = QPointF(paint_size_new.width() / 2, paint_size_new.height() / 2);
21 rect_topl = QPointF(rect_center.rx() - (paint_size_new.height() / 2 - 15), rect_center.ry() + (paint_size_new.height() / 2 - 15));
22 rect_bottomr = QPointF(rect_center.rx() + (paint_size_new.height() / 2 - 15), rect_center.ry() - (paint_size_new.height() / 2 - 15));
23
24 scale_value = 1.05;
25
26 mousepress_org = QPointF(0, 0);
27
28 axis_x_old = QPointF(rect_center.rx(), 0);
29 axis_y_old = QPointF(0, rect_center.ry());
30
31 axis_scale = 20.0;
32
33 offsetv_x = rect_center.rx();
34 offsetv_y = rect_bottomr.ry();
35 pixel_per_mm = (double)(rect_bottomr.rx() - rect_topl.rx()) / 600;
36
37 mouse_current_pos = QPointF(rect_center.rx(), rect_center.ry());
38 this->setMouseTracking(true);
39
40 //this->resize(880, 640);
41 }
42
43 MyWidget::~MyWidget()
44 {
45
46 }
47
48 void MyWidget::paintEvent(QPaintEvent *event)
49 {
50 paint_size_new = QSize(this->width() - margin_size * 2, this->height() - margin_size * 2);
51
52 QImage image = QImage(paint_size_new, QImage::Format_RGB32);
53 QColor backColor = qRgb(255, 255, 255);
54 image.fill(backColor);
55
56 if (paint_size_new != paint_size_old)
57 {
58 offset_x = 0;
59 offset_y = paint_size_new.height();
60
61 paint_center_new = QPointF(paint_size_new.width() / 2, paint_size_new.height() / 2);
62 rect_center = paint_center_new - paint_center_old + rect_center;
63 rect_topl = paint_center_new - paint_center_old + rect_topl;
64 rect_bottomr = paint_center_new - paint_center_old + rect_bottomr;
65
66 paint_size_old = paint_size_new;
67 paint_center_old = paint_center_new;
68 }
69
70 offsetv_x = rect_center.rx();
71 offsetv_y = rect_bottomr.ry();
72 pixel_per_mm = (double)(rect_bottomr.rx() - rect_topl.rx()) / 600;
73
74 QPainter painter2(&image);
75 QRectF rec(DisplayPtoObjectP(rect_topl), DisplayPtoObjectP(rect_bottomr));
76 painter2.drawRect(rec);
77 painter2.drawPoint(DisplayPtoObjectP(rect_center));
78 painter2.drawText(QPointF(mouse_current_pos.rx(), mouse_current_pos.ry()), "(" + QString::number(ObjectPtoValueP(mouse_current_pos).rx(), 'f', 1) + "mm, " + QString::number(ObjectPtoValueP(mouse_current_pos).ry(), 'f', 1) + "mm)");
79 //painter2.drawPoint(ValuePtoObjectP(QPointF(-150.0, 150.0))); //(-150mm, 150mm)
80
81 QPainter painter(this);
82 //painter.setRenderHint(QPainter::Antialiasing, true);
83 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(image.width(), 0))));
84 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-0.01, 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-0.01, image.height()))));
85
86 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, -10))));
87 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-10, 0))));
88 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(image.width(), 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(image.width(), -10))));
89 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, image.height()))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-10, image.height()))));
90 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, -20))), QString::number((double)(0 - offsetv_x) / pixel_per_mm, 'f', 1));
91 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-30, 0))), QString::number((double)(0 - offsetv_y) / pixel_per_mm, 'f', 1));
92 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(image.width(), -20))), QString::number((double)(image.width() - offsetv_x) / pixel_per_mm, 'f', 1));
93 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-30, image.height()))), QString::number((double)(image.height() - offsetv_y) / pixel_per_mm, 'f', 1));
94 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(image.width() / 2, -35))), QString(tr("X [mm]")));
95 painter.rotate(-90);
96 painter.drawText(QPointF(- (image.height() / 2 + 20), 15), QString(tr("Z [mm]")));
97 painter.rotate(90);
98
99 if (rect_center.rx() > 0 && rect_center.rx() < image.width())
100 {
101 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(rect_center.rx(), 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(rect_center.rx(), -10))));
102 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(rect_center.rx(), -20))), QString::number((double)(rect_center.rx() - offsetv_x) / pixel_per_mm, 'f', 1));
103 }
104
105 if (rect_center.ry() > 0 && rect_center.ry() < image.height())
106 {
107 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, rect_center.ry()))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-10, rect_center.ry()))));
108 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-30, rect_center.ry()))), QString::number((double)(rect_center.ry() - offsetv_y) / pixel_per_mm, 'f', 1));
109 }
110
111 if (axis_scale >= 35.0)
112 {
113 axis_scale = axis_scale / 2;
114 }
115 else if (axis_scale <= 15.0)
116 {
117 axis_scale = axis_scale * 2;
118 }
119
120 axis_x_old = QPointF(rect_center.rx(),0);
121 int i = 0;
122 while (axis_x_old.rx() > axis_scale)
123 {
124 axis_x_old.rx() = axis_x_old.rx() - axis_scale;
125 i++;
126 if (axis_x_old.rx() > 0 && axis_x_old.rx() < image.width())
127 {
128 if (i % 5 == 0)
129 {
130 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), -10))));
131 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), -20))), QString::number((double)(axis_x_old.rx() - offsetv_x) / pixel_per_mm, 'f', 1));
132 }
133 else
134 {
135 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), -5))));
136 }
137 }
138 }
139 axis_x_old = QPointF(rect_center.rx(), 0);
140 i = 0;
141 while ((image.width() - axis_x_old.rx()) > axis_scale)
142 {
143 axis_x_old.rx() = axis_x_old.rx() + axis_scale;
144 i++;
145 if (axis_x_old.rx() > 0 && axis_x_old.rx() < image.width())
146 {
147 if (i % 5 == 0)
148 {
149 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), -10))));
150 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), -20))), QString::number((double)(axis_x_old.rx() - offsetv_x) / pixel_per_mm, 'f', 1));
151 }
152 else
153 {
154 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), 0))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(axis_x_old.rx(), -5))));
155 }
156 }
157 }
158
159 axis_y_old = QPointF(0, rect_center.ry());
160 i = 0;
161 while (axis_y_old.ry() > axis_scale)
162 {
163 axis_y_old.ry() = axis_y_old.ry() - axis_scale;
164 i++;
165 if (axis_y_old.ry() > 0 && axis_y_old.ry() < image.height())
166 {
167 if (i % 5 == 0)
168 {
169 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, axis_y_old.ry()))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-10, axis_y_old.ry()))));
170 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-30, axis_y_old.ry()))), QString::number((double)(axis_y_old.ry() - offsetv_y) / pixel_per_mm, 'f', 1));
171 }
172 else
173 {
174 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, axis_y_old.ry()))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-5, axis_y_old.ry()))));
175 }
176 }
177 }
178 axis_y_old = QPointF(0, rect_center.ry());
179 i = 0;
180 while ((image.height() - axis_y_old.ry()) > axis_scale)
181 {
182 axis_y_old.ry() = axis_y_old.ry() + axis_scale;
183 i++;
184 if (axis_y_old.ry() > 0 && axis_y_old.ry() < image.height())
185 {
186 if (i % 5 == 0)
187 {
188 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, axis_y_old.ry()))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-10, axis_y_old.ry()))));
189 painter.drawText(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-30, axis_y_old.ry()))), QString::number((double)(axis_y_old.ry() - offsetv_y) / pixel_per_mm, 'f', 1));
190 }
191 else
192 {
193 painter.drawLine(ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(0, axis_y_old.ry()))), ObjectPtoWidgetP(DisplayPtoObjectP(QPointF(-5, axis_y_old.ry()))));
194 }
195 }
196 }
197
198 painter.drawImage(paint_org, image);
199 }
200
201 void MyWidget::wheelEvent(QWheelEvent *event)
202 {
203 QPointF mousepos = WidgetPtoObjectP(event->pos());
204 if (event->delta() > 0)
205 {
206 rect_center = scaleIn(rect_center, ObjectPtoDisplayP(mousepos), scale_value);
207 rect_topl = scaleIn(rect_topl, ObjectPtoDisplayP(mousepos), scale_value);
208 rect_bottomr = scaleIn(rect_bottomr, ObjectPtoDisplayP(mousepos), scale_value);
209 axis_scale = axis_scale * scale_value;
210 }
211 else
212 {
213 rect_center = scaleOut(rect_center, ObjectPtoDisplayP(mousepos), scale_value);
214 rect_topl = scaleOut(rect_topl, ObjectPtoDisplayP(mousepos), scale_value);
215 rect_bottomr = scaleOut(rect_bottomr, ObjectPtoDisplayP(mousepos), scale_value);
216 axis_scale = axis_scale / scale_value;
217 }
218
219 repaint();
220 }
221
222 void MyWidget::mouseMoveEvent(QMouseEvent *event)
223 {
224 mouse_current_pos = WidgetPtoObjectP(event->pos());
225
226 if (event->buttons() & Qt::LeftButton)
227 {
228 QPointF mousepos_move = ObjectPtoDisplayP(WidgetPtoObjectP(event->pos()));
229
230 rect_center = mousepos_move - mousepress_org + rect_center;
231 rect_topl = mousepos_move - mousepress_org + rect_topl;
232 rect_bottomr = mousepos_move - mousepress_org + rect_bottomr;
233
234 mousepress_org = mousepos_move;
235 }
236
237 repaint();
238 }
239
240 void MyWidget::mousePressEvent(QMouseEvent *event)
241 {
242 if (event->button() == Qt::LeftButton)
243 {
244 mousepress_org = ObjectPtoDisplayP(WidgetPtoObjectP(event->pos()));
245 }
246 }
247
248 QPointF MyWidget::ObjectPtoDisplayP(QPointF objPoint)
249 {
250 return QPointF(objPoint.rx() - offset_x, -objPoint.ry() + offset_y);
251 }
252
253 QPointF MyWidget::DisplayPtoObjectP(QPointF disPoint)
254 {
255 return QPointF(disPoint.rx() + offset_x, -disPoint.ry() + offset_y);
256 }
257
258 QPointF MyWidget::scaleIn(QPointF pos_before, QPointF scale_center, double scale_value)
259 {
260 QPointF temp;
261 temp.rx() = (double)(pos_before.rx() - scale_center.rx()) * scale_value + scale_center.rx();
262 temp.ry() = (double)(pos_before.ry() - scale_center.ry()) * scale_value + scale_center.ry();
263 return temp;
264 }
265
266 QPointF MyWidget::scaleOut(QPointF pos_before, QPointF scale_center, double scale_value)
267 {
268 QPointF temp;
269 temp.rx() = (double)(pos_before.rx() - scale_center.rx()) / scale_value + scale_center.rx();
270 temp.ry() = (double)(pos_before.ry() - scale_center.ry()) / scale_value + scale_center.ry();
271 return temp;
272 }
273
274 QPointF MyWidget::WidgetPtoObjectP(QPointF wigPoint)
275 {
276 return QPointF(wigPoint - paint_org);
277 }
278
279 QPointF MyWidget::ObjectPtoWidgetP(QPointF objPoint)
280 {
281 return QPointF(objPoint + paint_org);
282 }
283
284 QPointF MyWidget::ValuePtoObjectP(QPointF valPoint)
285 {
286 return DisplayPtoObjectP(QPointF(valPoint.rx() * pixel_per_mm + offsetv_x, valPoint.ry() * pixel_per_mm + offsetv_y));
287 }
288
289 QPointF MyWidget::ObjectPtoValueP(QPointF objPoint)
290 {
291 return QPointF((double)(ObjectPtoDisplayP(objPoint).rx() - offsetv_x) / pixel_per_mm, (double)(ObjectPtoDisplayP(objPoint).ry() - offsetv_y) / pixel_per_mm);
292 }
代碼搞得有點復雜，用於顯示三維輪廓測量的深度輪廓。
特點：
1、顯示鼠標點坐標值
2、矩形框坐標值固定
①以鼠標點為中心滾輪等比例縮放，矩形框隨之縮放，坐標軸跟著縮放（減少和插入中間值）
②鼠標左擊拖動白板視窗，矩形框隨之移動，坐標值跟著移動
3、窗口縮放，坐標系整體不縮放
有一個問題，Z軸的0.0值在縮放之後會變成-0.0，暫時未找到原因。
因為是第一次寫，思路可能不是很好，有更好的方法的話，可以探討。
