gseisviewtoolmagnify.c

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        } else if (GDK_SCROLL_DOWN == event->direction) {
            slow_size_data = (new_slow_end_data - new_slow_start_data) * zoom_rate;
            fast_size_data = (new_fast_end_data - new_fast_start_data) * zoom_rate;
        }

        new_slow_start_data -= (private->slow_end_data - private->slow_start_data - slow_size_data) / 2.0;
        new_slow_end_data += (private->slow_end_data - private->slow_start_data - slow_size_data) / 2.0;
        new_fast_start_data -= (private->fast_end_data - private->fast_start_data - fast_size_data) / 2.0;
        new_fast_end_data += (private->fast_end_data - private->fast_start_data - fast_size_data) / 2.0;
        if (new_slow_start_data < 0)
            new_slow_start_data = 0;
        if (new_slow_end_data > data_visibility->slow_size_data)
            new_slow_end_data = data_visibility->slow_size_data;
        if (new_fast_start_data < 0)
            new_fast_start_data = 0;
        if (new_fast_end_data > data_visibility->fast_size_data)
            new_fast_end_data = data_visibility->fast_size_data;

        if (private->data_mutex)
            g_mutex_lock (private->data_mutex);

        gboolean slow_start_changed = (private->slow_start_data != new_slow_start_data);
        gboolean slow_end_changed = (private->slow_end_data != new_slow_end_data);
        gboolean fast_start_changed = (private->fast_start_data != new_fast_start_data);
        gboolean fast_end_changed = (private->fast_end_data != new_fast_end_data);

        private->slow_start_data = new_slow_start_data;
        private->slow_end_data = new_slow_end_data;
        private->fast_start_data = new_fast_start_data;
        private->fast_end_data = new_fast_end_data;

        if (private->data_mutex)
            g_mutex_unlock (private->data_mutex);

        if (slow_start_changed)
            g_idle_add ((GSourceFunc)g_seis_view_tool_magnify_slow_start_notify_signal,
                        (gpointer)G_SEIS_VIEW_TOOL_MAGNIFY (tool));
        if (slow_end_changed)
            g_idle_add ((GSourceFunc)g_seis_view_tool_magnify_slow_end_notify_signal,
                        (gpointer)G_SEIS_VIEW_TOOL_MAGNIFY (tool));
        if (fast_start_changed)
            g_idle_add ((GSourceFunc)g_seis_view_tool_magnify_fast_start_notify_signal,
                        (gpointer)G_SEIS_VIEW_TOOL_MAGNIFY (tool));
        if (fast_end_changed)
            g_idle_add ((GSourceFunc)g_seis_view_tool_magnify_fast_end_notify_signal,
                        (gpointer)G_SEIS_VIEW_TOOL_MAGNIFY (tool));

        g_idle_add ((GSourceFunc)g_seis_view_tool_magnify_viewport_signal, (gpointer)G_SEIS_VIEW_TOOL_MAGNIFY (tool));

        g_seis_view_tool_magnify_draw_rect (tool, seis_view_gl, data_visibility, FALSE);
    }
}

static void g_seis_view_tool_motion_event_int (GSeisViewTool *tool, GtkWidget *seis_view_gl, GdkEventMotion *event,
                                               GSeisViewDataVisibility *data_visibility) {
    GSeisViewToolMagnifyPrivate *private = G_SEIS_VIEW_TOOL_MAGNIFY_GET_PRIVATE (G_SEIS_VIEW_TOOL (tool));
    gdouble slow_epsilon = 4.0 * data_visibility->slow_size_data / (gdouble)data_visibility->slow_size_screen;
    gdouble fast_epsilon = 4.0 * data_visibility->fast_size_data / (gdouble)data_visibility->fast_size_screen;
    gdouble upper_horiz_dist = data_visibility->fast_pointer_pos_data - private->fast_start_data;
    gdouble lower_horiz_dist = data_visibility->fast_pointer_pos_data - private->fast_end_data;
    gdouble vert_left_dist = data_visibility->slow_pointer_pos_data - private->slow_start_data;
    gdouble vert_right_dist = data_visibility->slow_pointer_pos_data - private->slow_end_data;

    if (private->dragging) {
        gdouble new_slow_start_data = private->slow_start_data, new_slow_end_data = private->slow_end_data;
        gdouble new_fast_start_data = private->fast_start_data, new_fast_end_data = private->fast_end_data;

        g_seis_view_tool_magnify_draw_rect (tool, seis_view_gl, data_visibility, FALSE);
        switch (private->rect_element) {
            case G_SEIS_VIEW_TOOL_RECT_INSIDE:
                new_slow_start_data = private->slow_start_data - private->slow_pointer_data +
                                                                 data_visibility->slow_pointer_pos_data;
                new_slow_end_data = private->slow_end_data - private->slow_pointer_data +
                                                             data_visibility->slow_pointer_pos_data;
                new_fast_start_data = private->fast_start_data - private->fast_pointer_data +
                                                                 data_visibility->fast_pointer_pos_data;
                new_fast_end_data = private->fast_end_data - private->fast_pointer_data +
                                                             data_visibility->fast_pointer_pos_data;
                if (new_slow_start_data < 0) {
                    new_slow_start_data = 0;
                    new_slow_end_data = private->slow_end_data - private->slow_start_data;
                }
                if (new_slow_end_data > data_visibility->slow_size_data) {
                    new_slow_end_data = data_visibility->slow_size_data;
                    new_slow_start_data = new_slow_end_data - (private->slow_end_data - private->slow_start_data);
                }
                if (new_fast_start_data < 0) {
                    new_fast_start_data = 0;
                    new_fast_end_data = private->fast_end_data - private->fast_start_data;
                }
                if (new_fast_end_data > data_visibility->fast_size_data) {
                    new_fast_end_data = data_visibility->fast_size_data;
                    new_fast_start_data = new_fast_end_data - (private->fast_end_data - private->fast_start_data);
                }
                break;
            case G_SEIS_VIEW_TOOL_RECT_UH:
                new_fast_start_data = private->fast_start_data - private->fast_pointer_data +
                                                                 data_visibility->fast_pointer_pos_data;
                if (new_fast_start_data < 0)
                    new_fast_start_data = 0;
                if (new_fast_start_data > (new_fast_end_data - 2 * fast_epsilon))
                    new_fast_start_data = new_fast_end_data - 2 * fast_epsilon;
                break;
            case G_SEIS_VIEW_TOOL_RECT_LH:
                new_fast_end_data = private->fast_end_data - private->fast_pointer_data +
                                                             data_visibility->fast_pointer_pos_data;
                if (new_fast_end_data > data_visibility->fast_size_data)
                    new_fast_end_data = data_visibility->fast_size_data;
                if (new_fast_end_data < (new_fast_start_data + 2 * fast_epsilon))
                    new_fast_end_data = new_fast_start_data + 2 * fast_epsilon;
                break;
            case G_SEIS_VIEW_TOOL_RECT_VR:
                new_slow_end_data = private->slow_end_data - private->slow_pointer_data +
                                                             data_visibility->slow_pointer_pos_data;
                if (new_slow_end_data > data_visibility->slow_size_data)
                    new_slow_end_data = data_visibility->slow_size_data;
                if (new_slow_end_data < (new_slow_start_data + 2 * slow_epsilon))
                    new_slow_end_data = new_slow_start_data + 2 * slow_epsilon;
                break;
            case G_SEIS_VIEW_TOOL_RECT_VL:
                new_slow_start_data = private->slow_start_data - private->slow_pointer_data +
                                                                 data_visibility->slow_pointer_pos_data;
                if (new_slow_start_data < 0)
                    new_slow_start_data = 0;
                if (new_slow_start_data > (new_slow_end_data - 2 * slow_epsilon))
                    new_slow_start_data = new_slow_end_data - 2 * slow_epsilon;
                break;
            case G_SEIS_VIEW_TOOL_RECT_UR:
                new_slow_end_data = private->slow_end_data - private->slow_pointer_data +
                                                             data_visibility->slow_pointer_pos_data;
                new_fast_start_data = private->fast_start_data - private->fast_pointer_data +
                                                                 data_visibility->fast_pointer_pos_data;
                if (new_slow_end_data > data_visibility->slow_size_data)
                    new_slow_end_data = data_visibility->slow_size_data;
                if (new_slow_end_data < (new_slow_start_data + 2 * slow_epsilon))
                    new_slow_end_data = new_slow_start_data + 2 * slow_epsilon;
                if (new_fast_start_data < 0)
                    new_fast_start_data = 0;
                if (new_fast_start_data > (new_fast_end_data - 2 * fast_epsilon))
                    new_fast_start_data = new_fast_end_data - 2 * fast_epsilon;
                break;
            case G_SEIS_VIEW_TOOL_RECT_UL:
                new_slow_start_data = private->slow_start_data - private->slow_pointer_data +
                                                                 data_visibility->slow_pointer_pos_data;
                new_fast_start_data = private->fast_start_data - private->fast_pointer_data +
                                                                 data_visibility->fast_pointer_pos_data;
                if (new_slow_start_data < 0)
                    new_slow_start_data = 0;
                if (new_slow_start_data > (new_slow_end_data - 2 * slow_epsilon))
                    new_slow_start_data = new_slow_end_data - 2 * slow_epsilon;
                if (new_fast_start_data < 0)
                    new_fast_start_data = 0;
                if (new_fast_start_data > (new_fast_end_data - 2 * fast_epsilon))
                    new_fast_start_data = new_fast_end_data - 2 * fast_epsilon;
                break;
            case G_SEIS_VIEW_TOOL_RECT_LR:
                new_slow_end_data = private->slow_end_data - private->slow_pointer_data +
                                                             data_visibility->slow_pointer_pos_data;
                new_fast_end_data = private->fast_end_data - private->fast_pointer_data +
                                                             data_visibility->fast_pointer_pos_data;
                if (new_slow_end_data > data_visibility->slow_size_data)
                    new_slow_end_data = data_visibility->slow_size_data;
                if (new_slow_end_data < (new_slow_start_data + 2 * slow_epsilon))
                    new_slow_end_data = new_slow_start_data + 2 * slow_epsilon;
                if (new_fast_end_data > data_visibility->fast_size_data)
                    new_fast_end_data = data_visibility->fast_size_data;
                if (new_fast_end_data < (new_fast_start_data + 2 * fast_epsilon))
                    new_fast_end_data = new_fast_start_data + 2 * fast_epsilon;
                break;
            case G_SEIS_VIEW_TOOL_RECT_LL:
                new_slow_start_data = private->slow_start_data - private->slow_pointer_data +
                                                                 data_visibility->slow_pointer_pos_data;
                new_fast_end_data = private->fast_end_data - private->fast_pointer_data +
                                                             data_visibility->fast_pointer_pos_data;
                if (new_slow_start_data < 0)
                    new_slow_start_data = 0;
                if (new_slow_start_data > (new_slow_end_data - 2 * slow_epsilon))
                    new_slow_start_data = new_slow_end_data - 2 * slow_epsilon;
                if (new_fast_end_data > data_visibility->fast_size_data)
                    new_fast_end_data = data_visibility->fast_size_data;
                if (new_fast_end_data < (new_fast_start_data + 2 * fast_epsilon))
                    new_fast_end_data = new_fast_start_data + 2 * fast_epsilon;
                break;
            default:
                break;
        }

        if (private->data_mutex)
            g_mutex_lock (private->data_mutex);

        private->slow_start_data = new_slow_start_data;
        private->slow_end_data = new_slow_end_data;
        private->fast_start_data = new_fast_start_data;
        private->fast_end_data = new_fast_end_data;

        if (private->data_mutex)
            g_mutex_unlock (private->data_mutex);

        g_idle_add ((GSourceFunc)g_seis_view_tool_magnify_viewport_signal, (gpointer)G_SEIS_VIEW_TOOL_MAGNIFY (tool));

        private->slow_pointer_data = data_visibility->slow_pointer_pos_data;
        private->fast_pointer_data = data_visibility->fast_pointer_pos_data;

        g_seis_view_tool_magnify_draw_rect (tool, seis_view_gl, data_visibility, FALSE);
    } else {
        GdkCursor *new_cursor = NULL;
        GSeisViewToolRectElement new_rect_element = G_SEIS_VIEW_TOOL_RECT_OUTSIDE;

        if (upper_horiz_dist < 0)
            upper_horiz_dist = -upper_horiz_dist;
        if (lower_horiz_dist < 0)
            lower_horiz_dist = -lower_horiz_dist;
        if (vert_left_dist < 0)
            vert_left_dist = -vert_left_dist;
        if (vert_right_dist < 0)
            vert_right_dist = -vert_right_dist;

        if (upper_horiz_dist < fast_epsilon) {
            if (vert_left_dist < slow_epsilon) {
                new_cursor = private->ul_angle_cursor;
                new_rect_element = G_SEIS_VIEW_TOOL_RECT_UL;
            } else if (vert_right_dist < slow_epsilon) {
                new_cursor = private->ur_angle_cursor;
                new_rect_element = G_SEIS_VIEW_TOOL_RECT_UR;
            } else if (data_visibility->slow_pointer_pos_data > private->slow_start_data &&
                       data_visibility->slow_pointer_pos_data < private->slow_end_data) {
                new_cursor = private->horiz_scale_cursor;
                new_rect_element = G_SEIS_VIEW_TOOL_RECT_UH;
            }
        } else if (lower_horiz_dist < fast_epsilon) {
            if (vert_left_dist < slow_epsilon) {
                new_cursor = private->ll_angle_cursor;
                new_rect_element = G_SEIS_VIEW_TOOL_RECT_LL;
            } else if (vert_right_dist < slow_epsilon) {
                new_cursor = private->lr_angle_cursor;
                new_rect_element = G_SEIS_VIEW_TOOL_RECT_LR;
            } else if (data_visibility->slow_pointer_pos_data > private->slow_start_data &&
                       data_visibility->slow_pointer_pos_data < private->slow_end_data) {
                new_cursor = private->horiz_scale_cursor;
                new_rect_element = G_SEIS_VIEW_TOOL_RECT_LH;
            }
        } else if (vert_left_dist < slow_epsilon) {
            if (upper_horiz_dist < fast_epsilon) {
                new_cursor = private->ul_angle_cursor;
                new_rect_element = G_SEIS_VIEW_TOOL_RECT_UL;
            } else if (lower_horiz_dist < fast_epsilon) {
                new_cursor = private->ll_angle_cursor;