ImageProcessTool/ImageView.cpp at main · wangzehui20/ImageProcessTool · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
#include "ImageView.h"

#include <QScrollBar>

float cross = 12;
float crossSize = 2;

ImageView::ImageView(QWidget *parent) {
	//set view background and its border transparent
	setStyleSheet("background: transparent");

	//window motion without cursor
	this->setDragMode(QGraphicsView::NoDrag);
	//set view as child window
	this->setWindowFlags(Qt::CustomizeWindowHint | Qt::FramelessWindowHint);
	this->setCursor(Qt::CrossCursor);
	setMouseTracking(true);

	//close view scrollbar
	this->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	this->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

	scaleUp = 1.2;
	scaleDown = 1 / 1.2;
}

ImageView::~ImageView() {

}

void ImageView::on_moveImg(QPointF cursorTranslation) {
	cursorTranslation *= this->transform().m11();

	//call scale method
	this->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
	//translation need to scale
	this->centerOn(this->mapToScene(QPoint(this->viewport()->rect().width() / 2 - cursorTranslation.x(),
		this->viewport()->rect().height() / 2 - cursorTranslation.y())));
	this->setTransformationAnchor(QGraphicsView::AnchorViewCenter);
}

//虚拟十字标
void ImageView::on_virtualMouseMove(QPointF point)
{
	//调用scene的虚拟十字标
	ImageScene* tmpScene = (ImageScene*)this->scene();
	tmpScene->moveVirtualPos(point);
}

void ImageView::on_wheelImg(QPointF viewPos, float scaleIndex) {
	//scene coordinate
	QPointF scenePos = this->mapToScene(viewPos.toPoint());
	this->scale(scaleIndex, scaleIndex);

	//image in view has scaled
	QPointF scaledViewPos = this->matrix().map(scenePos);
}

void ImageView::mouseMoveEvent(QMouseEvent *event) {
	if (this->dragMode() == QGraphicsView::ScrollHandDrag) {
		QPoint currentCursorPos = event->pos();
		QPointF cursorTranslation = mapToScene(currentCursorPos) - mapToScene(lastCursorPos);
		emit moveImg(cursorTranslation);
		on_moveImg(cursorTranslation);
		lastCursorPos = currentCursorPos;
	}
	lastCursorPos = event->pos();
	emit virtualMouseMove(mapToScene(event->pos()));
	on_virtualMouseMove(mapToScene(event->pos()));

	//display cursor location

	QGraphicsView::mouseMoveEvent(event);
}

void ImageView::mousePressEvent(QMouseEvent* event) {
	if (event->button() == Qt::MidButton) {
		this->setCursor(Qt::OpenHandCursor);
		this->setDragMode(QGraphicsView::ScrollHandDrag);
		//view coordinate
		lastCursorPos = event->pos();
	}
	QGraphicsView::mousePressEvent(event);
}

void ImageView::mouseReleaseEvent(QMouseEvent *event){
	if (event->button() == Qt::MidButton){
		this->setDragMode(QGraphicsView::NoDrag);
		this->setCursor(Qt::CrossCursor);
	}
	QGraphicsView::mouseReleaseEvent(event);
}

void ImageView::wheelEvent(QWheelEvent* event) {
	float scaleIndex;
	QPointF viewPos = event->pos();
	event->delta() > 0 ? (scaleIndex = scaleUp) : (scaleIndex = scaleDown);

	//change linked cross-cusor as soon as wheeling
	cross /= scaleIndex;
	crossSize /= scaleIndex;

	emit wheelImg(viewPos, scaleIndex);
	on_wheelImg(viewPos, scaleIndex);

	//缩放后刷新十字标
	lastCursorPos = event->pos();
	emit virtualMouseMove(mapToScene(lastCursorPos));
	on_virtualMouseMove(mapToScene(lastCursorPos));
}