librecad二次开发

1/ui 部份

    1/增加主菜单
    ![在这里插入图片描述](https://img-blog.csdnimg.cn/65e596109caf43a485505ab1b705ea94.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETkDns5bnjq8,size_18,color_FFFFFF,t_70,g_se,x_16)

    增加子菜单项

3/plt dxf 转换 只转换成简单连续线段
端点 0 — x y 坐标 标志 10/20
端点 1 — x y 坐标 标志 11/21

 起笔  抬笔 转换成  sec 及段结束

2/显示接口

获取当前界面  组件单元列表

RS_BlockList* RS_Block::getBlockList() {
RS_Graphic* g = getGraphic();
if (g) {
    return g->getBlockList();
} else {
    return NULL;
}
}

4/端点绘线接口 镜像操作 负坐标处理

/**
* Adds a line to the current graphic document.
*/
void rsPyAddLine(double x1, double y1, double x2, double y2) {
//printf("c: addLine called\n");
//printf("c: parameter from python: %f\n", x1);

    RS_Graphic* graphic = RS_SIMPLEPYTHON->getGraphic();
if (graphic!=NULL) {
    graphic->addEntity(new RS_Line(graphic,
                                   RS_LineData(RS_Vector(x1, y1),
                                               RS_Vector(x2, y2))));
} else {
    std::cerr << "rsPyAddLine: No graphic object set.\n";
}
}

5/鼠标滚轮控制缩放

//将下面事件操作替换
if (scroll && scrollbars) {
	//scroll by scrollbars: issue #479
    RS_SETTINGS->beginGroup("/Defaults");
    bool inv_h = (RS_SETTINGS->readNumEntry("/WheelScrollInvertH", 0) == 1);
    bool inv_v = (RS_SETTINGS->readNumEntry("/WheelScrollInvertV", 0) == 1);
    RS_SETTINGS->endGroup();

    int delta;

	switch(direction){
	case RS2::Left:
	case RS2::Right:
        delta = (inv_h) ? -e->delta() : e->delta();
		hScrollBar->setValue(hScrollBar->value()+delta);
		break;
	default:
        delta = (inv_v) ? -e->delta() : e->delta();
		vScrollBar->setValue(vScrollBar->value()+delta);
	}

//        setCurrentAction(new RS_ActionZoomScroll(direction,
//                         *container, *this));
}

// zoom in / out:
else if (e->modifiers()==0) {

7/绘制工作空间大小，以指定缩放/对应屏幕像素及转换后实时中心点为原点画矩形

QRect(-50, -50, 300, 300)

8/添加图元及block 选中显示 tableview

 添加 point 映射
 添加选中映射
       选中处理代码


/**
 * @return True if the entity is in the given range.
*/
 bool RS_Entity::isInWindow(RS_Vector v1,        RS_Vector v2) const
{
double right, left, top, bottom;

right = std::max(v1.x, v2.x);
left = std::min(v1.x, v2.x);
top = std::max(v1.y, v2.y);
bottom = std::min(v1.y, v2.y);

return (getMin().x>=left &&
        getMax().x<=right &&
        getMin().y>=bottom &&
        getMax().y<=top);
}


 获取图元id
 获取图元名称

        
// There should be a better way then this...
switch(e.rtti()) {
case RS2::EntityPoint:
    os << (RS_Point&)e;
    break;

case RS2::EntityLine:
    os << (RS_Line&)e;
    break;

case RS2::EntityPolyline:
    os << (RS_Polyline&)e;
    break;

case RS2::EntityArc:
    os << (RS_Arc&)e;
    break;
 添加图元参数控制

10/多点触控/键盘方向键移动

     if (e->modifiers() & Qt::ControlModifier)
{        auto value = text();        if (value.isEmpty())            value = relative_ray;        QString r_string;        switch (e->key())        {            case Qt::Key_Up:                r_string = "0," + value;                break;            case Qt::Key_Down:                r_string = "0,-" + value;                break;            case Qt::Key_Right:                r_string = value + ",0";                break;            case Qt::Key_Left:                r_string = "-" + value + ",0";                break;            default:                QLineEdit::keyPressEvent(e);                return;        }
    


void Widget::mouseMoveEvent(QMouseEvent * event)
{
       qDebug()<<tr("%1,%2").arg(event->pos().x()).arg(event->pos().y());
}

11/系统坐标中点绘制随窗体自动拉伸定位框

QPainter painter(this);
static double wid = rect().width();
static double hei = rect().height();

painter.setRenderHints(QPainter::Antialiasing, true);//抗锯齿

double new_wid = rect().width()/wid;
double new_hei = rect().height()/hei;
painter.scale(new_wid,  new_hei);