--- a/OHP3D.cpp	Wed Dec 27 12:50:47 2023 +0100
+++ b/OHP3D.cpp	Wed Dec 27 23:25:06 2023 +0100
@@ -309,6 +309,36 @@
 	runShaders();
 	glXSwapBuffers(dpy, win);
 
+	auto goPage = [&](int count) {
+		// TODO: support pages with different ratios
+		ctx.moveRight(count * 1.8 * textures[0]->getRatio());
+	};
+
+	auto goHome = [&]() {
+		ctx.cameraFront = initialCtx.cameraFront;
+		ctx.cameraPos = initialCtx.cameraPos;
+		ctx.cameraUp = initialCtx.cameraUp;
+	};
+
+	auto goEnd = [&]() {
+		goHome();
+		goPage(textures.size() - 1);
+	};
+
+	auto goPageMouse = [&](XButtonEvent ev) {
+		XWindowAttributes gwa;
+		XGetWindowAttributes(dpy, win, &gwa);
+
+		bool top = ev.y < gwa.height / 2, bottom = !top;
+		bool left = ev.x < gwa.width / 2, right = !left;
+
+		if (top && left) goHome();
+		else if (top && right) goEnd();
+		else if (bottom && left) goPage(-1);
+		else if (bottom && right) goPage(+1);
+	};
+
+
 	for (XEvent xev; keepRunningX11;) {
 		int epollEventCount = epoll.wait();
 		//std::cout << "trace: epoll.wait() = " << epollEventCount << std::endl;
@@ -338,9 +368,6 @@
 
 					const float cSp = 0.05f; // camera speed
 					const float aSp = 5.f; // angle speed
-					const float pSp = 1.8 * textures[0]->getRatio(); // page
-					// TODO: support pages with different ratios
-					// TODO: import original controls from the private prototype
 
 					if (key.matches(XK_q, XK_Escape)) keepRunningX11 = false;
 					else if (key.matches(XK_Left, XK_s)) ctx.turnLeft(aSp);
@@ -355,10 +382,10 @@
 					else if (key.matches(XK_comma)) ctx.moveRight(cSp);
 					else if (key.matches(XK_l)) ctx.moveUp(cSp);
 					else if (key.matches(XK_period)) ctx.moveDown(cSp);
-					else if (key.matches(XK_j)) ctx.moveLeft(pSp);
-					else if (key.matches(XK_k)) ctx.moveRight(pSp);
-					else if (key.matches(XK_u)) ctx.moveLeft(cSp * 10);
-					else if (key.matches(XK_i)) ctx.moveRight(cSp * 10);
+					else if (key.matches(XK_j, XK_Page_Up)) goPage(-1);
+					else if (key.matches(XK_k, XK_Page_Down)) goPage(+1);
+					else if (key.matches(XK_u, XK_Home)) goHome();
+					else if (key.matches(XK_i, XK_End)) goEnd();
 					else if (key.matches(XK_x)) resetView();
 					else if (key.matches(XK_F11, XK_y)) toggleFullscreen();
 					redraw = true;
@@ -366,7 +393,7 @@
 					std::cout << "XEvent: ButtonPress:"
 							<< " button=" << xev.xbutton.button
 							<< std::endl;
-					if (xev.xbutton.button == 1);
+					if (xev.xbutton.button == 1) goPageMouse(xev.xbutton);
 					else if (xev.xbutton.button == 4) ctx.adjustFov(-1.0);
 					else if (xev.xbutton.button == 5) ctx.adjustFov(+1.0);
 					else if (xev.xbutton.button == 8) resetView();