bool GiTransform::zoomWnd(const Point2d& pt1, const Point2d& pt2, bool adjust)
{
// 计算开窗矩形的中心和宽高
Point2d ptCen ((pt2.x + pt1.x) * 0.5f, (pt2.y + pt1.y) * 0.5f);
float w = fabs(static_cast<float>(pt2.x - pt1.x));
float h = fabs(static_cast<float>(pt2.y - pt1.y));
if (w < 4 || h < 4)
return false;
// 中心不变，扩大开窗矩形使得宽高比例和显示窗口相同
if (h * m_impl->cxWnd > w * m_impl->cyWnd)
w = h * m_impl->cxWnd / m_impl->cyWnd;
else
h = w * m_impl->cyWnd / m_impl->cxWnd;
// 计算放缩前矩形中心的世界坐标
Point2d ptW (ptCen * m_impl->matD2W);
// 计算新显示比例
float scale = m_impl->viewScale * m_impl->cyWnd / h;
if (!adjust && ScaleOutRange(scale, m_impl))
return false;
scale = mgMax(scale, m_impl->minViewScale);
scale = mgMin(scale, m_impl->maxViewScale);
// 计算新显示比例下的显示窗口的世界坐标范围
float halfw = m_impl->cxWnd / (m_impl->w2dx / m_impl->viewScale * scale) * 0.5f;
float halfh = m_impl->cyWnd / (m_impl->w2dy / m_impl->viewScale * scale) * 0.5f;
Box2d box (ptW, 2 * halfw, 2 * halfh);
// 检查显示窗口的新坐标范围是否在极限范围内
if (!m_impl->rectLimitsW.isEmpty() && !m_impl->rectLimitsW.contains(box))
{
if (adjust)
AdjustCenterW(ptW, halfw, halfh, m_impl->rectLimitsW);
else
return false;
}
// 改变显示比例和位置
return m_impl->zoomNoAdjust(ptW, scale);
}
bool GiTransform::zoomScale(float viewScale, const Point2d* pxAt, bool adjust)
{
// 检查显示比例
if (!adjust && ScaleOutRange(viewScale, m_impl))
return false;
viewScale = mgMax(viewScale, m_impl->minViewScale);
viewScale = mgMin(viewScale, m_impl->maxViewScale);
// 得到放缩中心点的客户区坐标
Point2d ptAt (m_impl->cxWnd * 0.5f, m_impl->cyWnd * 0.5f);
if (pxAt != NULL)
ptAt.set(pxAt->x, pxAt->y);
// 得到放缩中心点在放缩前的世界坐标
Point2d ptAtW (ptAt * m_impl->matD2W);
// 计算新显示比例下显示窗口中心的世界坐标
Point2d ptW;
float w2dx = m_impl->w2dx / m_impl->viewScale * viewScale;
float w2dy = m_impl->w2dy / m_impl->viewScale * viewScale;
ptW.x = ptAtW.x + (m_impl->cxWnd * 0.5f - ptAt.x) / w2dx;
ptW.y = ptAtW.y - (m_impl->cyWnd * 0.5f - ptAt.y) / w2dy;
// 检查新显示比例下显示窗口的世界坐标范围是否在极限范围内
float halfw = m_impl->cxWnd / w2dx * 0.5f;
float halfh = m_impl->cyWnd / w2dy * 0.5f;
Box2d box (ptW, 2 * halfw, 2 * halfh);
if (!AdjustCenterIn(adjust, box, m_impl->rectLimitsW, ptW, halfw, halfh)) {
return false;
}
if (halfw - 3 > m_impl->rectLimitsW.width() / 2
&& halfh - 3 > m_impl->rectLimitsW.height() / 2) // 显示比例太小
{
viewScale *= mgMin(2 * (halfw - 3) / m_impl->rectLimitsW.width(),
2 * (halfh - 3) / m_impl->rectLimitsW.height());
viewScale = mgMin(viewScale, m_impl->maxViewScale);
}
return m_impl->zoomNoAdjust(ptW, viewScale);
}
bool GiTransform::zoomScale(float viewScale, const Point2d* pxAt, bool adjust)
{
// 检查显示比例
if (!adjust && ScaleOutRange(viewScale, m_impl))
return false;
viewScale = mgMax(viewScale, m_impl->minViewScale);
viewScale = mgMin(viewScale, m_impl->maxViewScale);
// 得到放缩中心点的客户区坐标
Point2d ptAt (m_impl->cxWnd * 0.5f, m_impl->cyWnd * 0.5f);
if (pxAt != NULL)
ptAt.set(pxAt->x, pxAt->y);
// 得到放缩中心点在放缩前的世界坐标
Point2d ptAtW (ptAt * m_impl->matD2W);
// 计算新显示比例下显示窗口中心的世界坐标
Point2d ptW;
float w2dx = m_impl->w2dx / m_impl->viewScale * viewScale;
float w2dy = m_impl->w2dy / m_impl->viewScale * viewScale;
ptW.x = ptAtW.x + (m_impl->cxWnd * 0.5f - ptAt.x) / w2dx;
ptW.y = ptAtW.y - (m_impl->cyWnd * 0.5f - ptAt.y) / w2dy;
// 检查新显示比例下显示窗口的世界坐标范围是否在极限范围内
float halfw = m_impl->cxWnd / w2dx * 0.5f;
float halfh = m_impl->cyWnd / w2dy * 0.5f;
Box2d box (ptW, 2 * halfw, 2 * halfh);
if (!m_impl->rectLimitsW.isEmpty() && !m_impl->rectLimitsW.contains(box))
{
if (adjust)
AdjustCenterW(ptW, halfw, halfh, m_impl->rectLimitsW);
else
return false;
}
return m_impl->zoomNoAdjust(ptW, viewScale);
}
bool GiTransform::zoomTo(const Box2d& rectWorld, const RECT_2D* rcTo, bool adjust)
{
// 如果图形范围的宽或高接近于零，就返回
if (rectWorld.isEmpty())
return false;
// 计算像素到毫米的比例
const float d2mmX = m_impl->viewScale / m_impl->w2dx;
const float d2mmY = m_impl->viewScale / m_impl->w2dy;
// 计算目标窗口区域(毫米)
float w = 0, h = 0;
Point2d ptCen;
if (rcTo != NULL) {
w = fabsf(static_cast<float>(rcTo->right - rcTo->left));
h = fabsf(static_cast<float>(rcTo->bottom - rcTo->top));
ptCen.x = (rcTo->left + rcTo->right) * 0.5f;
ptCen.y = (rcTo->top + rcTo->bottom) * 0.5f;
}
if (w < 4 || h < 4) {
w = (float)m_impl->cxWnd;
h = (float)m_impl->cyWnd;
ptCen.set(w * 0.5f, h * 0.5f);
w -= 8;
h -= 8;
}
if (w < 4 || h < 4)
return false;
w *= d2mmX;
h *= d2mmY;
ptCen.scaleBy(d2mmX, d2mmY);
// 计算新显示比例 (中心不变，缩小窗口区域使得宽高比例和图形范围相同)
float scale;
if (h * rectWorld.width() > w * rectWorld.height()) {
//h = w * rectWorld.height() / rectWorld.width();
scale = w / rectWorld.width();
}
else {
//w = h * rectWorld.width() / rectWorld.height();
scale = h / rectWorld.height();
}
// 检查显示比例
if (!adjust && ScaleOutRange(scale, m_impl))
return false;
scale = mgMax(scale, m_impl->minViewScale);
scale = mgMin(scale, m_impl->maxViewScale);
// 计算在新显示比例下显示窗口中心的世界坐标
Point2d ptW;
ptW.x = rectWorld.center().x + (m_impl->cxWnd * d2mmX * 0.5f - ptCen.x) / scale;
ptW.y = rectWorld.center().y - (m_impl->cyWnd * d2mmY * 0.5f - ptCen.y) / scale;
// 检查新显示比例下显示窗口的世界坐标范围是否在极限范围内
float halfw = m_impl->cxWnd * d2mmX / scale * 0.5f;
float halfh = m_impl->cyWnd * d2mmY / scale * 0.5f;
Box2d box (ptW, 2 * halfw, 2 * halfh);
if (!AdjustCenterIn(adjust, box, m_impl->rectLimitsW, ptW, halfw, halfh)) {
return false;
}
return m_impl->zoomNoAdjust(ptW, scale);
}
