107 lines
1.9 KiB
C++
107 lines
1.9 KiB
C++
#ifndef SCALER2D_H
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#define SCALER2D_H
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#include <QPoint>
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#include <Indoor/geo/Point2.h>
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class Scaler2D {
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private:
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Point2 screenSize = Point2(400,400);
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Point2 center_m = Point2(0,0);
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float rotation_rad = 0.0f;
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float scaleFactor = 1;
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public:
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Scaler2D() {
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;
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}
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/** set the screen's size (in pixel) */
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void setScreenSize(const float w_px, const float h_px) {
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this->screenSize = Point2(w_px, h_px);
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}
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/** change the point displayed within the center of the screen */
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void setCenter(const float x_m, const float y_m) {
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this->center_m = Point2(x_m, y_m);
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}
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/** change the point displayed within the center of the screen */
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void setCenterM(const Point2 center_m) {
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this->center_m = center_m;
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}
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/** change the point displayed within the center of the screen */
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void setCenterPX(const Point2 center_px) {
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this->center_m = pxToM(center_px);
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}
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Point2 getCenterPX() const {
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return mToPX(this->center_m);
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}
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/** set the map's rotation in radians */
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void setRotation(const float rad) {
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this->rotation_rad = rad;
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}
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void setScale(const float scale) {
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this->scaleFactor = scale;
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}
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public:
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float mToPX(const float m) const {
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return m * scaleFactor * (screenSize.x * 0.01);
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}
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float pxToM(const float px) const {
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return px / scaleFactor / (screenSize.x * 0.01);
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}
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Point2 pxToM(const Point2 pt) const {
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return Point2(pxToM(pt.x), pxToM(pt.y));
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}
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Point2 mToPX(const Point2 pt) const {
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return Point2(mToPX(pt.x), mToPX(pt.y));
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}
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/** convert map to screen coordinates */
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Point2 mapToScreen(const Point2 pt_m) const {
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Point2 pt = pt_m;
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// move to (0,0)
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pt -= center_m;
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// rotate
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pt = Point2(
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std::cos(rotation_rad) * pt.x - std::sin(rotation_rad) * pt.y,
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std::sin(rotation_rad) * pt.x + std::cos(rotation_rad) * pt.y
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);
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// scale
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pt.x = mToPX(pt.x);
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pt.y = mToPX(pt.y);
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// add screen-center
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pt += screenSize/2;
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// negate y
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pt.y = screenSize.y - pt.y;
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// done
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return pt;
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}
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};
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#endif // SCALER2D_H
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